Austenitic stainless steel hot-rolled plate with high plastic formability and production method thereof

Abstract

The invention discloses a high-plasticity formability austenitic stainless steel hot-rolled plate and a production method thereof. The production method specifically comprises the following steps: 1) heating; 2) descaling with high-pressure water; 2) descaling with high-pressure water; 4) finish rolling; 5) coiling after cooling; 6) uncoiling and welding; 7) annealing; 8) cooling; (10) coiling, wherein a cooling device in the step (8) comprises a treatment box, an air cooling device and a water cooling device; the annealed stainless steel plate enters an air cooling box at the inlet of the treatment box and is cooled by a group of air cooling devices; then the stainless steel plate enters the water cooling box, the water cooling device rapidly cools the stainless steel plate through cooling water, finally the stainless steel plate enters the air cooling box at the outlet of the treatment box, and the stainless steel plate is cooled through the other air cooling device; according to the method, the annealed stainless steel plate quickly crosses a sensitization temperature interval through three-section cooling of air cooling, water cooling and air cooling, and carbide is prevented from being separated out among austenite grains to influence the quality of the stainless steel plate.

Description

Technical Field

[0001] The invention belongs to the technical field of hot-rolled stainless steel, and particularly relates to a high-plasticity austenitic stainless steel hot-rolled plate and a production method thereof. Background Art

[0002] Since the sensitization temperature range of austenitic stainless steel is between 600℃-650℃, when cooling the austenitic stainless steel after annealing, it is necessary to control the rapid cooling of the austenitic stainless steel to reduce the time the austenitic stainless steel stays in this temperature range to prevent carbides such as Cr23C6 from precipitating between austenite grains and affecting the quality of austenitic stainless steel;

[0003] After searching, the prior art publication number is CN116254407A, which is an air-cooled steel strip cooling device. The device extracts low-temperature air through an air inlet fan and injects it into the air duct. The air-cooling plate sprays the low-temperature air onto the hot steel strip through the air outlet. The spray direction of the low-temperature air is opposite to the movement direction of the steel strip. The low-temperature air pushes the hot air above the steel strip to the rear of the forward direction of the steel strip, and the steel strip is cooled by air cooling. Austenitic stainless steel can only be cooled at a uniform speed under the treatment of this device, so it will keep the austenitic stainless steel in the sensitization temperature range for a long time, resulting in the precipitation of various carbides and causing the sensitivity of austenitic stainless steel to intergranular corrosion.

[0004] After searching, the prior art publication number CN216274253U is a strip rapid cooling device for an annealing furnace. The device controls the injection pressure of the injection protective gas by changing the distance between the first zone, the second zone, the third zone and the strip body, so as to obtain different cooling rates; but the temperature of the injected protective gas will increase after contacting the strip, and it will be mixed into the injected low-temperature protective gas, affecting the cooling effect of the low-temperature protective gas on the strip. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a high plastic formability austenitic stainless steel hot-rolled plate and a production method thereof. The present invention uses a three-stage cooling method of air cooling-water cooling-air cooling to allow the annealed stainless steel plate to quickly cross the sensitization temperature range, thereby preventing carbides from precipitating between austenite grains and affecting the quality of the stainless steel plate.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A high plastic formability austenitic stainless steel hot-rolled plate and a production method thereof, the specific production method is as follows:

[0008] 1) Heating: The heating process is divided into a preheating stage, a first heating stage, a second heating stage, and a soaking stage. The temperature in the preheating stage is controlled at 1025°C - 1064°C to heat the steel billet for 60 - 80 minutes; the temperature in the first heating stage is controlled at 1125°C - 1176°C to heat the steel billet for 35 - 50 minutes; the temperature in the second heating stage is controlled at 1225°C - 1257°C to heat the steel billet for 50 - 75 minutes; the temperature in the soaking stage is controlled at 1233°C - 1250°C to heat the steel billet for 45 - 65 minutes; the furnace pressure is controlled at 10 - 20 Pa, and the heating rate of the steel billet is controlled at 0.8 minutes / mm.

[0009] 2) High-pressure water descaling: Remove the scale on the surface of the heated steel billet through high-pressure water to prevent the scale from having an adverse effect on the surface quality of the steel billet during the rolling process.

[0010] 3) Rough rolling: The heated steel billet is conveyed to the roughing mill through a conveying device equipped with a heat preservation cover. During rough rolling, the steel billet is rolled 7 passes, and the rolling speed is 3 m / s - 6 m / s; the reduction rate in the first pass is 29.22% - 31.51%; the reduction rate in the second pass is 27.73% - 29.24%; the reduction rate in the third pass is 26.73% - 28.24%; the reduction rate in the fourth pass is 25.27% - 27.83%; the reduction rate in the fifth pass is 24.79% - 26.87%; the reduction rate in the sixth pass is 23.23% - 25.38%; the reduction rate in the seventh pass is 21.45% - 22.82%.

[0011] 4) Finish rolling: Finish rolling uses hot continuous rolling. The steel billet after rough rolling enters the finish rolling mechanism through transmission. Finish rolling adopts speed-up rolling and uses pressure AGC. The starting rolling temperature in finish rolling is set at 1050°C - 1125°C; the finishing temperature in finish rolling > 900°C.

[0012] 5) Cooling and coiling: After finish rolling, quickly cool the stainless steel and coil the cooled stainless steel plate.

[0013] 6) Uncoiling and welding: Uncoil the stainless steel coil and weld and fix adjacent two groups of steel plates through the welding mechanism.

[0014] 7) Annealing: Anneal the stainless steel strip through the annealing mechanism at a temperature of 875°C - 1150°C.

[0015] 8) Cooling: After the stainless steel plate is annealed, it is along the attached Figure 1The stainless steel plate enters the processing box in the cooling device in the direction indicated by the middle arrow. The stainless steel plate is first in the air cooling box at the inlet, and a group of air cooling devices are used to reduce the temperature of the stainless steel plate to 687℃-700℃; then the stainless steel plate enters the water cooling box, and the water cooling device uses cooling water to quickly reduce the temperature of the stainless steel plate to 276℃-412℃, and finally enters the air cooling box at the outlet of the processing box, and another group of air cooling devices are used to cool the stainless steel plate to 65℃-110℃;

[0016] 9) Pickling after phosphorus breaking; Shot blast the stainless steel strip at a speed of 15M / min-25M / min through a shot blasting device with a blasting head current of 100A, and then send it into the pickling tank for pickling;

[0017] 10) Coiling: The pickled stainless steel plate is transported into the cleaning device for cleaning, then the moisture on the stainless steel plate is dried and the stainless steel plate is coiled.

[0018] The cooling device in step 8) includes a processing box, an air cooling device, and a water cooling device; a plurality of transport rollers are arranged in the processing box, and two groups of partitions arranged inside the processing box divide the processing box into a water cooling box and two groups of air cooling boxes, and a plurality of inspection doors are respectively arranged on one side of the water cooling box and the two groups of air cooling boxes, and the drain port is arranged at the bottom of the other side of the water cooling box; the air cooling device is provided with two groups, which are respectively arranged in the two groups of air cooling boxes; the water cooling device is arranged in the water cooling box; the air cooling device includes baffle I, baffle II, electric push cylinder I, gas conveying mechanism I, gas conveying mechanism II, wind shielding mechanism, Electric push cylinder II; the gas delivery mechanism I is provided with two groups, which are respectively fixedly connected to the two sides of the baffle I, and the cylinder bodies of several groups of electric push cylinders II are symmetrically fixed on the side walls on both sides of the air-cooled box through connecting seats, and the protruding ends are respectively fixedly connected to the two ends of the gas delivery mechanism I; the gas delivery mechanism II is provided with two groups, which are respectively fixedly connected to the two sides of the baffle II, and the cylinder bodies of several groups of electric push cylinders I are symmetrically fixed on the side walls on both sides of the air-cooled box through connecting seats, and the protruding ends are respectively fixedly connected to the two ends of the baffle II; the wind shielding mechanism is slidably connected between the gas delivery mechanism I and the gas delivery mechanism II.

[0019] The gas delivery mechanism I is provided with a connecting pipe I, a gas tank, a delivery pipe, a rotating roller I, a connecting plate, a baffle plate, and a sliding groove; one side of the gas tank is fixedly connected to the baffle plate I, the other side is rotatably connected to the rotating roller I, and both ends of the gas tank are fixedly connected to the extending ends of the electric push cylinders II; one side of the delivery pipe is fixedly connected to the top of the gas tank, and the other side is fixedly connected to the connecting pipe I fixed on the air-cooling box through a hose; a plurality of baffle plates are provided, and are respectively slidably connected to the sliding grooves at both ends of the gas tank through sliding shafts, adjacent baffle plates are rotatably connected together, and the baffle plates at both ends are respectively rotatably connected to the connecting plates rotatably connected to one end of the gas tank and the wind shielding mechanism; and one of the two gas delivery mechanisms I is connected to the air outlet of the gas cooling device through the connecting pipe I, and the other gas delivery mechanism I is connected to the air inlet of the gas cooling device through the connecting pipe I.

[0020] The gas delivery mechanism II is provided with a connecting pipe II, a connecting box, a motor I, a lead screw I, a sealing plate I, a shunt pipe, an air pipe, a guiding block, a telescopic mechanism, and a shielding mechanism; one side of the connecting box is fixedly connected to the baffle plate II, and the other side is provided with a shielding mechanism; the lead screw I is rotatably connected to one side of the connecting box, and the thread directions on both sides of the lead screw I are opposite; the motor I is fixedly connected to the bottom of the connecting box through a motor base, and the sprocket on the output end of the motor I is connected to the sprocket on the lead screw I through a chain; a plurality of air pipes are rotatably connected to the telescopic mechanism, the telescopic mechanism is slidably connected between the sealing plate I and the connecting box, a pair of sealing plates I are respectively threadedly connected to both sides of the lead screw I, and a guiding block is provided on one side of the sealing plate I; the shunt pipe is fixedly connected to the bottom of the connecting box, and a plurality of interfaces on one side of the shunt pipe are respectively connected to a plurality of air pipes through hoses, and the interface on the other side is connected to the connecting pipe II fixed on the side wall of the air-cooling box through a hose; and one of the two gas delivery mechanisms II is connected to the air outlet of the gas cooling device through the connecting pipe II, and the other gas delivery mechanism II is connected to the air inlet of the gas cooling device through the connecting pipe II.

[0021] The wind shielding mechanism is provided with a motor II, a lead screw II, a baffle plate III, and a guiding shaft; the motor II is fixedly connected to the gas tank in one of the gas delivery mechanisms I through a motor base, the lead screw II with opposite thread directions on both sides is located on one side of the motor II and is rotatably connected to the support frames provided at both ends of the gas tank, and the sprocket on the output end of the motor II is connected to the sprocket on the lead screw II through a chain; the guiding shaft is provided on one side of the other gas delivery mechanism I, and both ends of the guiding shaft are fixedly connected to the support frames provided at both ends of the gas tank; a pair of baffle plates III are symmetrically arranged between the baffle plate I and the baffle plate II, one end of the pair of baffle plates III is symmetrically threadedly connected to both sides of the lead screw II, the other end is slidably connected to the guiding shaft, and the baffle plate III extends into the gas tank from the air port at the bottom of the gas tank through the connecting plate and is rotatably connected to the connecting plate.

[0022] The telescopic mechanism is provided with a connecting rod I, a connecting rod II, a sliding seat I, a connecting cylinder, and a sliding seat II; there are several connecting rods I and II, and the connecting cylinder with an air pipe inside is rotatably connected between the connecting rods I and II. One end of the connecting rod I is respectively rotatably connected to one end of two other connecting rods II, and one end of the connecting rod II is respectively rotatably connected to one end of two other connecting rods I; there is a pair of sliding seats II, one side of the sliding seat II is slidably connected to a guiding block, and the other side is rotatably connected to one end of the outermost connecting rod II; there is a pair of sliding seats I, the sliding seats I are located inside the sealing plate I and are slidably connected to the sliding grooves on the connecting box, and one side of the sliding seat I is rotatably connected to one end of the outermost connecting rod I.

[0023] The shielding mechanism is provided with a lifting seat, a rotating roller II, a limiting rod, a connecting box, and a spring; both ends of the limiting rod are fixedly connected to the connecting box, the bottom of the lifting seat passes through between the connecting box and the limiting rod, and is slidably connected to several connecting boxes with springs inside through several sliding rods. One side of the connecting box is fixedly connected to the connecting box, and the rotating roller II is arranged on the top of the lifting seat.

[0024] The water cooling device includes a water tank, a water inlet pipe I, a connecting pipe IV, a connecting pipe V, a cooling mechanism, a protective cover, a cooling mechanism, and a water inlet pipe III; a water outlet groove is provided at the bottom of the water tank, a motor III is provided on the outside, a lead screw III is rotatably connected inside, the sprocket on the output end of the motor III is connected to the sprocket on the lead screw III through a chain, and the thread directions at both ends of the lead screw III are opposite; a pair of sealing plates II are symmetrically arranged on both sides of the water tank, and the top of the sealing plate II is threadedly connected to the lead screw III and the bottom is slidably connected to the guiding rod fixedly connected inside the water tank; one side of the water inlet pipe I is fixedly connected to the water tank, and the other side is fixedly connected to the connecting pipe III fixed on the top of the water cooling box through a hose, and one end of the connecting pipe III is connected to the liquid cooling device through a hose; there are two groups of cooling mechanisms, which are respectively fixedly connected to both sides of the water tank; the connecting pipe IV and the connecting pipe V are respectively located on both sides of the connecting pipe III and are fixedly connected to the water cooling box, and the top end of the connecting pipe IV is connected to the water inlet of the cooling device through a hose, and the top end of the connecting pipe V is connected to the water outlet of the cooling device through a hose; there is a pair of protective covers, which are respectively fixedly connected to both sides of the water cooling box, and the cylinders of two groups of electric push cylinders IV are located inside the protective covers and are fixedly connected to the water cooling box, and the extending ends pass through the through holes on the protective covers and are fixedly connected to the support plate arranged at the bottom of the cooling mechanism; one side of the water inlet pipe III is fixedly connected to the cooling mechanism, and the other side is connected to the connecting pipe VI fixed on the side wall of the water cooling box through a hose, and one end of the connecting pipe VI is connected to the liquid cooling device through a hose.

[0025] The temperature reduction mechanism is provided with a cooling box, an electric push cylinder III, a water outlet pipe, a water inlet pipe II, and a rotating roller III; one side of the cooling box is fixedly connected to the water tank, and the other side is provided with a rotating roller III; the water outlet pipe and the water inlet pipe II are fixedly connected to the water tank diagonally, and one end of the water inlet pipe II is connected to the connecting pipe V through a hose, and one end of the water outlet pipe is connected to the connecting pipe IV through a hose; a number of electric push cylinders III are provided, and the cylinders of the electric push cylinders III are symmetrically fixed on both sides of the water cooling box through connecting seats, and the extending ends are fixedly connected to both ends of the water tank.

[0026] The cooling mechanism is provided with a support box, a sliding plate I, a sliding groove I, a sliding groove II, a sliding plate II, a sliding plate III, a guide rod, a motor IV, and a lead screw IV; a pair of support plates are symmetrically fixed at the bottom of the support box, a guide rod is provided on one side, and a lead screw IV is rotatably connected to the other side, and the thread directions on both sides of the lead screw IV are opposite; the motor IV is fixedly connected to a protective box provided at the bottom of the support box, the output end of the motor IV passes through the through hole on the protective box and is fixedly connected to a sprocket, and the sprocket on the motor IV is connected to the sprocket on the lead screw IV through a chain; the sliding groove I and the sliding groove II are fixedly connected to the support box on both sides of the water storage tank on the support box; a pair of sliding plates I are provided, which are respectively slidably connected to both ends of the support box, one ends of the sliding plate II and the sliding plate III are fixedly connected to the sliding plate I, and the other ends are respectively slidably connected to the sliding groove I and the sliding groove II, and one side of the sliding plate I is threadedly connected to the lead screw IV, and the other side is slidably connected to the guide rod.

[0027] The beneficial effects of the present invention compared with the prior art are as follows:

[0028] 1) The flow range of the cooling gas is restricted by the wind blocking mechanism, the baffle I, the baffle II and the two groups of gas conveying mechanisms I and II in the air cooling device, preventing the cooling gas from diffusing out of the range where the stainless steel plate is located, thereby improving the cooling effect of the cooling gas on the stainless steel plate;

[0029] 2) The gas cooling device passes a group of gas conveying mechanisms I and a group of gas conveying mechanisms II to introduce cooling gas to the position where the stainless steel plate is located; the temperature of the cooling gas gradually rises during the process of flowing along the upper and lower surfaces of the stainless steel plate to the other group of gas conveying mechanisms I and the other group of gas conveying mechanisms II. At this time, the gas cooling device cooperates with the other group of gas conveying mechanisms I and the other group of gas conveying mechanisms II to recover the gas after the temperature rises, so as to realize the circulating flow of the cooling gas and the gas after the temperature rises, preventing the cooling gas from being doped with the gas after the temperature rises and affecting the cooling effect of the cooling gas on the stainless steel plate;

[0030] 3) The cooling mechanism in the water cooling device exchanges heat with the cooling water that flows through the water tank and reaches the upper surface of the stainless steel plate, enabling the cooling water to continuously cool the stainless steel plate and accelerating the cooling rate of the stainless steel plate. At the same time, the cooling mechanism flushes the lower surface of the stainless steel plate with the cooling water to cool the stainless steel. In this way, through double-sided cooling treatment, the stainless steel plate can quickly cross the sensitization temperature range, preventing carbide precipitation between austenite grains and affecting the quality of the stainless steel plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG Figure 1 is a schematic structural diagram of the cooling device;

[0032] FIG Figure 2 is FIG Figure 1 a schematic structural diagram of the treatment tank in FIG

[0033] FIG Figure 3 is FIG Figure 1 a schematic structural diagram of the air cooling device in FIG

[0034] FIG Figure 4 is FIG Figure 1 a schematic connection structure diagram of the gas delivery mechanism I and the wind shielding mechanism in FIG

[0035] FIG Figure 5 is FIG Figure 1 a schematic internal structure diagram of the gas delivery mechanism I in FIG

[0036] FIG Figure 6 is FIG Figure 5 an enlarged schematic structural diagram of part A in FIG

[0037] FIG Figure 7 is FIG Figure 1 a schematic connection structure diagram of the baffle II and the gas delivery mechanism II in FIG

[0038] FIG Figure 8 is FIG Figure 1 a schematic sectional structure diagram of the gas delivery mechanism II in FIG

[0039] FIG Figure 9 is FIG Figure 1 a schematic connection structure diagram of the telescopic mechanism and the sealing plate I in FIG

[0040] FIG Figure 10 is FIG Figure 1 a schematic structural diagram of the water cooling device in FIG

[0041] FIG Figure 11 is FIG Figure 1 a schematic structural diagram of the cooling mechanism in FIG

[0042] FIG Figure 12 is FIG Figure 1 a schematic internal structure diagram of the water tank in FIG

[0043] Appendix Figure 13 is the appendix Figure 1 structural schematic diagram of the cooling mechanism in it;

[0044] Appendix Figure 14 is the appendix Figure 1 cross-sectional structural schematic diagram of the cooling mechanism in it;

[0045] Appendix Figure 15 is the appendix Figure 1 structural schematic diagram of the connection structure between the support box and the support box in it;

[0046] In the figure: 1. Processing box; 101. Transport roller; 102. Maintenance door; 103. Partition board; 104. Drainage port; 105. Air-cooling box; 106. Water-cooling box; 2. Air-cooling device; 201. Baffle Ⅰ; 202. Baffle Ⅱ; 2021. Electric push cylinder Ⅰ; 203. Gas delivery mechanism Ⅰ; 2031. Connecting pipe Ⅰ; 2032. Gas tank; 2033. Delivery pipe; 2034. Rotating roller Ⅰ; 2035. Connecting plate; 2036. Shading plate; 2037. Chute; 204. Gas delivery mechanism Ⅱ; 2041. Connecting pipe Ⅱ; 2042. Connecting box; 2043. Motor Ⅰ; 2044. Lead screw Ⅰ; 2045. Sealing plate Ⅰ; 2046. Shunt pipe; 2047. Air pipe; 2048. Guide block; 205. Telescopic mechanism; 2051. Connecting rod Ⅰ; 2052. Connecting rod Ⅱ; 2053. Sliding seat Ⅰ; 2054. Connecting cylinder; 2055. Sliding seat Ⅱ; 206. Windshield mechanism; 2061. Motor Ⅱ; 2062. Lead screw Ⅱ; 2063. Baffle Ⅲ; 2064. Guide shaft; 207. Electric push cylinder Ⅱ; 208. Shielding mechanism; 2081. Lifting seat; 2082. Rotating roller Ⅱ; 2083. Limiting rod; 2084. Connecting box; 2085. Spring; 3. Water-cooling device; 301. Water tank; 3011. Motor Ⅲ; 3012. Lead screw Ⅲ; 3013. Guide rod; 3014. Sealing plate Ⅱ; 302. Water inlet pipe Ⅰ; 3021. Connecting pipe Ⅲ; 303. Connecting pipe Ⅳ; 304. Connecting pipe Ⅴ; 305. Cooling mechanism; 3051. Cooling box; 3052. Electric push cylinder Ⅲ; 3053. Outlet pipe; 3054. Water inlet pipe Ⅱ; 3055. Rotating roller Ⅲ; 306. Protective cover; 3061. Electric push cylinder Ⅳ; 3062. Support plate; 307. Cooling mechanism; 3071. Support box; 3072. Sliding plate Ⅰ; 3073. Sliding groove Ⅰ; 3074. Sliding groove Ⅱ; 3075. Sliding plate Ⅱ; 3076. Sliding plate Ⅲ; 3077. Guide rod; 3078. Motor Ⅳ; 3079. Lead screw Ⅳ; 308. Water inlet pipe Ⅲ; 3081. Connecting pipe Ⅵ; 4. Stainless steel plate. Detailed implementation method

[0047] For the convenience of understanding by those skilled in the art, the following is combined with the appendixFigure 1-15 , further specifically describe the technical solution of the present invention.

[0048] Example 1:

[0049] A hot-rolled plate of a high-plasticity formable austenitic stainless steel and its production method are as follows:

[0050] 1) Heating: The heating step is divided into a preheating section, a first heating section, a second heating section, and a soaking section; control the temperature of the preheating section at 1052 °C and heat the steel billet for 70 min; control the temperature of the first heating section at 1148 °C and heat the steel billet for 43 min; control the temperature of the second heating section at 1236 °C and heat the steel billet for 58 min; control the temperature of the soaking section at 1238 °C and heat the steel billet for 57 min; control the furnace pressure at 15 Pa, and control the steel billet to be heated at a rate of 0.8 min / mm.

[0051] 2) High-pressure water descaling; Remove the scale on the surface of the heated steel billet through high-pressure water to prevent the scale from having an adverse effect on the surface quality of the steel billet during rolling.

[0052] 3) Rough rolling; The heated steel billet is transferred to the roughing mill through a conveying device equipped with a heat preservation cover; During rough rolling, the steel billet is rolled for 7 passes, and the rolling speed is 4 m / s; The reduction rate of the first pass is 30.15%; The reduction rate of the second pass is 28.79%; The reduction rate of the third pass is 27.62%; The reduction rate of the fourth pass is 26.41%; The reduction rate of the fifth pass is 25.56%; The reduction rate of the sixth pass is 24.73%; The reduction rate of the seventh pass is 22.76%.

[0053] 4) Finish rolling; Finish rolling adopts hot continuous rolling. The steel billet after rough rolling enters the finish rolling mechanism through transmission. Finish rolling adopts speed-up rolling, and pressure AGC is put into use. The starting temperature of finish rolling is set at 1079 °C; The finishing temperature of finish rolling > 900 °C.

[0054] 5) Cooling and coiling: After finish rolling, quickly cool the stainless steel and coil the cooled stainless steel plate.

[0055] 6) Uncoiling and welding: Uncoil the stainless steel coil, and weld and fix adjacent two groups of steel plates through the welding mechanism.

[0056] 7) Annealing: Anneal the stainless steel strip at a temperature of 1050 °C through the annealing mechanism.

[0057] 8) Cooling: After the stainless steel plate 4 finishes annealing, it follows Figure 1The stainless steel plate 4 enters the processing box 1 in the cooling device in the direction indicated by the middle arrow. The stainless steel plate 4 is first in the air cooling box 105 at the inlet, and the temperature of the stainless steel plate 4 is reduced to 692°C by a set of air cooling devices 2. Then the stainless steel plate 4 enters the water cooling box 106, and the water cooling device 3 quickly reduces the temperature of the stainless steel plate 4 to 374°C through cooling water. Finally, the stainless steel plate 4 enters the air cooling box 105 at the outlet of the processing box 1, and is cooled to 97°C by another set of air cooling devices 2.

[0058] 9) Pickling after phosphorus breaking; Shot blast the stainless steel strip at a speed of 20 M / min through a shot blasting device with a blasting head current of 100A, and then send it into the pickling tank for pickling;

[0059] 10) Coiling: The pickled stainless steel plate 4 is transported into a cleaning device for cleaning, and then the moisture on the stainless steel plate 4 is dried, and the stainless steel plate 4 is coiled.

[0060] The cooling device in step 8) includes a processing box 1, an air cooling device 2, and a water cooling device 3; a plurality of transport rollers 101 are arranged in the processing box 1, and two groups of partitions 103 arranged inside the processing box 1 divide the processing box 1 into a water cooling box 106 and two groups of air cooling boxes 105, and a plurality of inspection doors 102 are respectively arranged on one side of the water cooling box 106 and the two groups of air cooling boxes 105, and a drain port 104 is arranged at the bottom of the other side of the water cooling box 106; the air cooling device 2 is provided with two groups, which are respectively arranged in the two groups of air cooling boxes 105; the water cooling device 3 is arranged in the water cooling box 106; the air cooling device 2 includes a baffle Ⅰ201, a baffle Ⅱ202, an electric push cylinder Ⅰ2021, a gas conveying mechanism Ⅰ203, and a gas conveying mechanism Ⅱ204 , wind shielding mechanism 206, electric push cylinder II 207; the gas conveying mechanism I 203 is provided with two groups, which are respectively fixedly connected on both sides of the baffle I 201, and the cylinder bodies of several groups of electric push cylinders II 207 are symmetrically fixed on the side walls on both sides of the air-cooled box 105 through connecting seats, and the protruding ends are respectively fixedly connected to the two ends of the gas conveying mechanism I 203; the gas conveying mechanism II 204 is provided with two groups, which are respectively fixedly connected on both sides of the baffle II 202, and the cylinder bodies of several electric push cylinders I 2021 are symmetrically fixed on the side walls on both sides of the air-cooled box 105 through connecting seats, and the protruding ends are respectively fixedly connected to the two ends of the baffle II 202; the wind shielding mechanism 206 is slidably connected between the gas conveying mechanism I 203 and the gas conveying mechanism II 204.

[0061] The gas delivery mechanism I 203 is provided with a connecting pipe I 2031, a gas tank 2032, a delivery pipe 2033, a rotating roller I 2034, a connecting plate 2035, a shielding plate 2036, and a sliding groove 2037. One side of the gas tank 2032 is fixedly connected to the baffle I 201, and the other side is rotatably connected to the rotating roller I 2034. Both ends of the gas tank 2032 are fixedly connected to the extending ends of the electric push cylinders II 207. One side of the delivery pipe 2033 is fixedly connected to the top of the gas tank 2032, and the other side is fixedly connected to the connecting pipe I 2031 fixed to the air-cooling box 105 through a hose. A number of shielding plates 2036 are provided, and are respectively slidably connected to the sliding grooves 2037 at both ends of the gas tank 2032 through sliding shafts. Adjacent shielding plates 2036 are rotatably connected together, and the shielding plates 2036 at both ends are respectively rotatably connected to the connecting plate 2035 rotatably connected to one end of the gas tank 2032 and the wind shielding mechanism 206. And one of the two gas delivery mechanisms I 203 is connected to the air outlet of the gas cooling device through the connecting pipe I 2031, and the other gas delivery mechanism I 203 is connected to the air inlet of the gas cooling device through the connecting pipe I 2031.

[0062] The gas delivery mechanism II 204 is provided with a connecting pipe II 2041, a connecting box 2042, a motor I 2043, a lead screw I 2044, a sealing plate I 2045, a shunt pipe 2046, an air pipe 2047, a guiding block 2048, a telescopic mechanism 205, and a shielding mechanism 208. One side of the connecting box 2042 is fixedly connected to the baffle II 202, and the other side is provided with the shielding mechanism 208. The lead screw I 2044 is rotatably connected to one side of the connecting box 2042, and the thread directions on both sides of the lead screw I 2044 are opposite. The motor I 2043 is fixedly connected to the bottom of the connecting box 2042 through a motor base, and the sprocket on the output end of the motor I 2043 is connected to the sprocket on the lead screw I 2044 through a chain. A number of air pipes 2047 are rotatably connected to the telescopic mechanism 205. The telescopic mechanism 205 is slidably connected between the sealing plate I 2045 and the connecting box 2042. A pair of sealing plates I 2045 are respectively threadedly connected to both sides of the lead screw I 2044, and a guiding block 2048 is provided on one side of the sealing plate I 2045. The shunt pipe 2046 is fixedly connected to the bottom of the connecting box 2042, and a number of interfaces on one side of the shunt pipe 2046 are respectively connected to a number of air pipes 2047 through hoses, and the interface on the other side is fixedly connected to the connecting pipe II 2041 fixed to the side wall of the air-cooling box 105 through a hose. And one of the two gas delivery mechanisms II 204 is connected to the air outlet of the gas cooling device through the connecting pipe II 2041, and the other gas delivery mechanism II 204 is connected to the air inlet of the gas cooling device through the connecting pipe II 2041.

[0063] The windshield mechanism 206 is provided with a motor II 2061, a lead screw II 2062, a baffle III 2063, and a guide shaft 2064; the motor II 2061 is fixedly connected to the air box 2032 in a set of gas delivery mechanisms I 203 through a motor base, the lead screw II 2062 with opposite thread directions on both sides is located on one side of the motor II 2061 and is rotationally connected to the support frames arranged at both ends of the air box 2032, and the sprocket on the output end of the motor II 2061 is connected to the sprocket on the lead screw II 2062 through a chain; the guide shaft 2064 is arranged on one side of the other set of gas delivery mechanisms I 203, and both ends of the guide shaft 2064 are fixedly connected to the support frames arranged at both ends of the air box 2032; a pair of baffles III 2063 are symmetrically arranged between the baffle I 201 and the baffle II 202, one end of the pair of baffles III 2063 is symmetrically threadedly connected to both sides of the lead screw II 2062, the other end is slidably connected to the guide shaft 2064, and the baffle III 2063 extends into the air box 2032 from the air port at the bottom of the air box 2032 through a connecting plate and is rotationally connected to the connecting plate 2035.

[0064] The stainless steel plate 4 enters the air cooling box 105 in the processing box 1 along the direction indicated by the arrow in the figure, and then controls a plurality of groups of electric push cylinders II 207 to run synchronously, driving the gas delivery mechanism I 203 and the baffle I 201 to descend until the rotating roller I 2034 fits the upper surface of the stainless steel plate 4; and controls a plurality of electric push cylinders I 2021 to run synchronously, so that the baffle II 202 drives the gas delivery mechanism II 204 to rise until both ends of the baffle II 202 and the connection box 2042 fit the bottom of the baffle III 2063; then the motor II 2061 cooperates with the lead screw II 2062 to drive the baffle III 2063 close to the side of the stainless steel plate 4; at the same time, the baffle III 2063 pulls the shielding baffle 2036 to unfold through the connecting plate 2035, shields the through groove at the bottom of the air box 2032, and drives the sealing plate I 2045 to move under the shielding baffle 2036 through the cooperation of the motor I 2043 and the lead screw I 2044, so that the widths of the through groove at the bottom of the air box 2032 and the opening at the top of the connection box 2042 adapt to the widths of stainless steel plates 4 of different sizes, and cooperate with the baffle III 2063 and the baffle II 202 to limit the flow range of the cooling gas, improving the effect of the cooling gas on cooling the stainless steel plate 4; Figure 1

[0065] ​After the gas cooling device passes cooling gas into a set of gas delivery mechanisms I 203 and a set of gas delivery mechanisms II 204 through connecting pipe I 2031 and connecting pipe II 2041; the cooling gas enters between the gas delivery mechanism I 203, baffle I 201 and baffle III 2063 through the through groove at the bottom of the gas tank 2032, so as to cool the upper surface of the stainless steel plate 4; at the same time, after the cooling gas enters the shunt pipe 2046, it enters between the gas delivery mechanism II 204, baffle II 202 and baffle III 2063 through the gas pipe 2047, so as to cool the lower surface of the stainless steel plate 4; during the process that the cooling gas flows along the upper and lower surfaces of the stainless steel plate 4 to another set of gas delivery mechanisms I 203 and another set of gas delivery mechanisms II 204, the temperature gradually rises. At this time, the air inlet of the gas cooling device recovers the gas with the increased temperature through another set of gas delivery mechanisms I 203 and another set of gas delivery mechanisms II 204, so as to realize the circular flow of the cooling gas and the gas with the increased temperature, and prevent the cooling gas from being doped with the gas with the increased temperature, which affects the cooling effect of the cooling gas on the stainless steel plate.

[0066] The telescopic mechanism 205 is provided with a connecting rod I 2051, a connecting rod II 2052, a sliding seat I 2053, a connecting cylinder 2054, and a sliding seat II 2055; there are several connecting rods I 2051 and connecting rods II 2052. The connecting cylinder 2054 with the gas pipe 2047 inside is rotatably connected between the connecting rods I 2051 and connecting rods II 2052, and both ends of the connecting rod I 2051 are respectively rotatably connected to one end of two other connecting rods II 2052, and both ends of the connecting rod II 2052 are respectively rotatably connected to one end of two other connecting rods I 2051; there is a pair of sliding seats II 2055. One side of the sliding seat II 2055 is slidably connected to the guide block 2048, and the other side is rotatably connected to one end of the outermost connecting rod II 2052; there is a pair of sliding seats I 2053. The sliding seats I 2053 are located inside the sealing plate I 2045 and are slidably connected to the sliding grooves on the connecting box 2042, and one side of the sliding seat I 2053 is rotatably connected to one end of the outermost connecting rod I 2051; while the sliding seat II 2055 moves along with the sealing plate I 2045, it will slide along the guide block 2048, thereby driving the connecting rods I 2051 and connecting rods II 2052 to cross-rotate with the connecting cylinder 2054 as the center point, so that the telescopic mechanism 205 drives the gas pipe 2047 to move inwards or outwards along with the movement of the sealing plate I 2045.

[0067] The shielding mechanism 208 is provided with a lifting seat 2081, a rotating roller II 2082, a limiting rod 2083, a connection box 2084, and a spring 2085; both ends of the limiting rod 2083 are fixedly connected to the connection box 2042. The bottom of the lifting seat 2081 passes through the space between the connection box 2042 and the limiting rod 2083 and is slidably connected to a plurality of connection boxes 2084 with springs 2085 inside through a plurality of sliding rods. One side of the connection box 2084 is fixedly connected to the connection box 2042, and the rotating roller II 2082 is arranged on the top of the lifting seat 2081. While the upper surface of the baffle II 202 and the connection box 2042 fits the bottom of the baffle III 2063, the rotating roller II 2082 fits the lower surface of the stainless steel plate 4 under the cooperation of the lifting seat 2081 and the spring 2085 to support the stainless steel plate 4. At the same time, the lifting seat 2081 shields the side of the gas delivery mechanism II 204 to prevent the cooling gas from diffusing outward from the gap between the gas delivery mechanism II 204 and the stainless steel plate 4.

[0068] The water cooling device 3 includes a water tank 301, a water inlet pipe I 302, a connection pipe IV 303, a connection pipe V 304, a temperature reduction mechanism 305, a protective cover 306, a cooling mechanism 307, and a water inlet pipe III 308; the bottom of the water tank 301 is provided with a water outlet groove, and an electric motor III 3011 is arranged on the outside. A lead screw III 3012 is rotatably connected inside. The sprocket on the output end of the electric motor III 3011 is connected to the sprocket on the lead screw III 3012 through a chain, and the thread directions at both ends of the lead screw III 3012 are opposite; a pair of sealing plates II 3014 are symmetrically arranged on both sides of the water tank 301, and the top of the sealing plate II 3014 is threadedly connected to the lead screw III 3012, and the bottom is slidably connected to a guide rod 3013 fixedly connected inside the water tank 301; one side of the water inlet pipe I 302 is fixedly connected to the water tank 301, and the other side is fixedly connected to a connection pipe III 3021 on the top of the water cooling box 106 through a hose, and one end of the connection pipe III 3021 is connected to a liquid cooling device through a hose; there are two groups of the temperature reduction mechanisms 305, which are respectively fixedly connected to both sides of the water tank 301; the connection pipe IV 303 and the connection pipe V 304 are respectively located on both sides of the connection pipe III 3021 and are fixedly connected to the water cooling box 106, and the top end of the connection pipe IV 303 is connected to the water inlet of the cooling device through a hose, and the top end of the connection pipe V 304 is connected to the water outlet of the cooling device through a hose; there are a pair of protective covers 306, which are respectively fixedly connected to both sides of the water cooling box 106, and the cylinders of two groups of electric push cylinders IV 3061 are located inside the protective covers 306 and are fixedly connected to the water cooling box 106, and the extending ends pass through the through holes on the protective covers 306 and are fixedly connected to a support plate 3062 arranged at the bottom of the cooling mechanism 307; one side of the water inlet pipe III 308 is fixedly connected to the cooling mechanism 307, and the other side is connected to a connection pipe VI 3081 fixedly connected to the side wall of the water cooling box 106 through a hose, and one end of the connection pipe VI 3081 is connected to a liquid cooling device through a hose.

[0069] The temperature reduction mechanism 305 is provided with a cooling box 3051, an electric push cylinder III 3052, a water outlet pipe 3053, a water inlet pipe II 3054, and a rotating roller III 3055; one side of the cooling box 3051 is fixedly connected to the water tank 301, and the other side is provided with the rotating roller III 3055; the water outlet pipe 3053 and the water inlet pipe II 3054 are fixedly connected to the water tank 301 diagonally, and one end of the water inlet pipe II 3054 is connected to the connecting pipe V 304 through a hose, and one end of the water outlet pipe 3053 is connected to the connecting pipe IV 303 through a hose; several electric push cylinders III 3052 are provided, and the cylinders of the electric push cylinders III 3052 are symmetrically fixed on both sides of the water cooling box 106 through connecting seats, and the extending ends are fixedly connected to both ends of the water tank 301.

[0070] The cooling mechanism 307 is provided with a support box 3071, a sliding plate I 3072, a sliding groove I 3073, a sliding groove II 3074, a sliding plate II 3075, a sliding plate III 3076, a guide rod 3077, a motor IV 3078, and a lead screw IV 3079; a pair of support plates 3062 are symmetrically fixed at the bottom of the support box 3071, a guide rod 3077 is provided on one side, and a lead screw IV 3079 is rotatably connected to the other side, and the thread directions on both sides of the lead screw IV 3079 are opposite; the motor IV 3078 is fixedly connected to the protective box provided at the bottom of the support box 3071, the output end of the motor IV 3078 passes through the through hole on the protective box and is connected to a sprocket, and the sprocket on the motor IV 3078 is connected to the sprocket on the lead screw IV 3079 through a chain; the sliding groove I 3073 and the sliding groove II 3074 are fixedly connected to the support box 3071 on both sides of the water storage tank on the support box 3071; a pair of sliding plates I 3072 are provided, which are respectively slidably connected to both ends of the support box 3071, one ends of the sliding plate II 3075 and the sliding plate III 3076 are fixedly connected to the sliding plate I 3072, and the other ends are respectively slidably connected to the sliding groove I 3073 and the sliding groove II 3074, and one side of the sliding plate I 3072 is threadedly connected to the lead screw IV 3079, and the other side is slidably connected to the guide rod 3077.

[0071] Several electric push cylinders III 3052 in the temperature reduction mechanism 305 operate synchronously to control the cooling box 3051 to descend until the rotating roller III 3055 contacts the stainless steel plate 4; at the same time, the motor III 3011 and the lead screw III 3012 cooperate to control the sealing plate II 3014 to align with the side of the stainless steel plate 4, and then the two groups of electric push cylinders IV 3061 operate synchronously to control the cooling mechanism 307 to rise until the top of the sliding plate I 3072 fits with the cooling box 3051, and finally the motor IV 3078 and the lead screw IV 3079 cooperate to control the sliding plate I 3072 to fit with the side of the stainless steel plate 4;

[0072] After the liquid cooling device passes cooling water into the water tank 301 and the water storage tank on the support box 3071 through the connecting pipe III 3021 and the connecting pipe VI 3081; the cooling water flows to the surface of the stainless steel plate 4 through the water outlet groove at the bottom of the water tank 301 and fills the gap between the upper surface of the stainless steel plate 4 and the cooling box 3051 and the sliding plate I 3072, thereby cooling the stainless steel plate 4. Subsequently, the cooling water flows to the bottom of the water cooling box 106 through the gap between the rotating roller III 3055 and the sliding plate I 3072 and is discharged through the drain port 104. At the same time, the coolant in the cooling device enters the cooling box 3051 through the connecting pipe V 304 and the water inlet pipe II 3054, enabling the cooling box 3051 to exchange heat with the cooling water filling the gap between the upper surface of the stainless steel plate 4 and the cooling box 3051 and the sliding plate I 3072, thereby realizing the continuous cooling of the stainless steel plate 4 by the cooling water, accelerating the cooling rate of the stainless steel plate 4. Subsequently, the coolant in the cooling box 3051 returns to the cooling device through the outlet pipe 3053 and the connecting pipe IV 303; the cooling water overflows along the sliding plate II 3075, the sliding plate III 3076 and the sliding groove I 3073, the sliding groove II 3074 on the support box 3071 to wash the lower surface of the stainless steel plate 4, thereby cooling the stainless steel plate 4 with the cooling water; thus, the stainless steel plate quickly crosses the sensitization temperature range through double-sided cooling treatment, preventing the precipitation of carbides between austenite grains and affecting the quality of the stainless steel plate 4.

[0073] Example 2:

[0074] Differing from Example 1:

[0075] 1) Heating: The heating process is divided into a preheating section, a first heating section, a second heating section, and a soaking section; control the temperature of the preheating section at 1025 °C to heat the steel billet for 60 min; control the temperature of the first heating section at 1125 °C to heat the steel billet for 35 min; control the temperature of the second heating section at 1225 °C to heat the steel billet for 50 min; control the temperature of the soaking section at 1233 °C to heat the steel billet for 45 min; control the furnace pressure at 10 Pa, and control the steel billet to be heated at a rate of 0.8 min / mm.

[0076] 3) Rough rolling; The heated steel billet is conveyed to the rough rolling mill through a conveying device equipped with a heat preservation cover; during rough rolling, the steel billet is rolled for 7 passes, and the rolling speed is 3 m / s; the reduction ratio of the first pass is 29.22%; the reduction ratio of the second pass is 27.73%; the reduction ratio of the third pass is 26.73%; the reduction ratio of the fourth pass is 25.27%; the reduction ratio of the fifth pass is 24.79%; the reduction ratio of the sixth pass is 23.23%; the reduction ratio of the seventh pass is 21.45%;

[0077] 4) Finish rolling; Finish rolling adopts hot continuous rolling. The steel billet after rough rolling enters the finish rolling mechanism through transmission. Finish rolling adopts speed-up rolling, and pressure AGC is put into use. The starting rolling temperature of finish rolling is set at 1050 °C; the finishing temperature of finish rolling > 900 °C;

[0078] 7) Annealing: The stainless steel strip is annealed at a temperature of 1050°C by an annealing mechanism;

[0079] 8) Cooling: After the stainless steel plate 4 is annealed, Figure 1 The stainless steel plate 4 enters the processing box 1 in the cooling device in the direction indicated by the middle arrow. The stainless steel plate 4 is first in the air cooling box 105 at the inlet, and the temperature of the stainless steel plate 4 is reduced to 700°C by a set of air cooling devices 2. Then the stainless steel plate 4 enters the water cooling box 106, and the water cooling device 3 quickly reduces the temperature of the stainless steel plate 4 to 412°C through cooling water. Finally, it enters the air cooling box 105 at the outlet of the processing box 1, and the stainless steel plate 4 is cooled to 110°C by another set of air cooling devices 2.

[0080] 9) Pickling after phosphorus breaking; Shot blast the stainless steel strip at a speed of 15 M / min through a shot blasting device with a blasting head current of 100A, and then send it into the pickling tank for pickling;

[0081] The remaining steps and parameters are the same as those in Example 1 and will not be repeated here.

[0082] Embodiment 3:

[0083] The difference from Example 1 is:

[0084] 1) Heating: The heating steps are divided into preheating section, heating section one, heating section two, and soaking section; the temperature of the preheating section is controlled at 1064°C to heat the steel billet for 60 minutes; the temperature of the heating section one is controlled at 1176°C to heat the steel billet for 40 minutes; the temperature of the heating section two is controlled at 1257°C to heat the steel billet for 60 minutes, and the temperature of the soaking section is controlled at 1250°C to heat the steel billet for 50 minutes; the furnace pressure is controlled at 18 Pa, and the steel billet is heated at a rate of 0.8 min / mm;

[0085] 3) Rough rolling: The heated billet is transferred to the rough rolling mill via a conveyor equipped with a heat preservation cover; the billet is rolled in 7 passes at a rolling speed of 6 m / s; the first pass reduction rate is 31.46%; the second pass reduction rate is 29.13%; the third pass reduction rate is 27.95%; the fourth pass reduction rate is 27.16%; the fifth pass reduction rate is 26.53%; the sixth pass reduction rate is 25.11%; the seventh pass reduction rate is 22.82%;

[0086] 4) Finishing rolling: The finishing rolling adopts hot continuous rolling. The billet after rough rolling is transferred into the finishing rolling mechanism. The finishing rolling adopts speed increase rolling, and the pressure AGC is used. The starting temperature of the finishing rolling is set at 1125℃; the finishing rolling end temperature is greater than 900℃;

[0087] 7) Annealing: Anneal the stainless steel strip at a temperature of 1150 °C through an annealing mechanism;

[0088] 8) Cooling: After the stainless steel plate 4 is annealed, it enters the processing box 1 in the cooling device along the direction indicated by the arrow in the attachment. The stainless steel plate 4 first enters the air-cooling box 105 at the inlet, and a set of air-cooling devices 2 reduces the temperature of the stainless steel plate 4 to 687 °C. Subsequently, the stainless steel plate 4 enters the water-cooling box 106, and the water-cooling device 3 rapidly reduces the temperature of the stainless steel plate 4 to 376 °C through cooling water. Finally, it enters the air-cooling box 105 at the outlet of the processing box 1, and another set of air-cooling devices 2 cools the stainless steel plate 4 to 82 °C; Figure 1

[0089] 9) Pickling after descaling; Shot blast the stainless steel strip at a speed of 25 m / min through a shot blasting device with a shot blasting current of 100 A and then send it into the pickling tank for pickling treatment;

[0090] The remaining steps and parameters are the same as those in Example 1 and will not be repeated here.

[0091] Comparative Example 1: Prepare an austenitic stainless steel plate by using the process with the publication number CN117025901A and the invention name "A heat treatment method for improving the low-temperature impact toughness of 13Cr martensitic stainless steel".

[0092] Comparative Example 2: Cool the annealed austenitic stainless steel plate by using the device with the publication number CN116254407A and the invention name "An air-cooled steel strip cooling device".

[0093] Experimental sampling was carried out on Examples 1-3 and Comparative Examples 1 and 2, and the samples were tested according to GB / T 4237-2015. The test results are shown in Table 1:

[0094] Table 1 Performance test results of each example and comparative example:

[0095] Tensile strength Mpa Yield strength Mpa Elongation after fracture % HV Example 1 600 290 57 195 Example 2 575 275 47 187 Example 3 550 220 50 207 Comparative example 1 515 185 40 178 Comparative example 2 425 163 25 77

[0096] Through the analysis of the experimental results of Examples 1-3, for the austenitic stainless steel plates produced by the hot rolling plate production method according to the present invention and the cooling device used in conjunction with the hot rolling plate production method, all their mechanical properties meet the production requirements and the experimental data are stable;

[0097] In Comparative Example 1 and Comparative Example 2, the annealed austenitic stainless steel plates were cooled at a uniform speed. By comparing the experimental data of Examples 1-3 with those of Comparative Example 1 and Comparative Example 2, it can be seen that too long residence time of the austenitic stainless steel plate in the sensitization temperature range will lead to a decrease in the quality of the austenitic stainless steel plate.

[0098] ​The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of the present technology can make various modifications, supplements, or use similar methods of substitution to the specific embodiments described. As long as it does not deviate from the structure of the invention or exceed the scope defined by this claim book, it shall fall within the protection scope of the present invention.

Claims

1. A high plastic formability austenitic stainless steel hot-rolled plate and a production method thereof, the specific production method is as follows: 1) Heating: The heating steps are divided into preheating section, heating section one, heating section two, and soaking section; the temperature of the preheating section is controlled at 1025℃-1064℃ to heat the steel billet for 60-80min; the temperature of the heating section one is controlled at 1125℃-1176℃ to heat the steel billet for 35-50min; the temperature of the heating section two is controlled at 1225℃-1257℃ to heat the steel billet for 50-75min, and the temperature of the soaking section is controlled at 1233℃-1250℃ to heat the steel billet for 45-65min; the furnace pressure is controlled at 10-20 pa, and the steel billet is heated at a rate of 0.8min / mm; 2) High-pressure water descaling: Use high-pressure water to remove the oxide scale on the surface of the heated billet to prevent the oxide scale from adversely affecting the surface quality of the billet during the rolling process; 3) Rough rolling; the heated billet is transferred to the rough rolling mill via a conveyor equipped with a heat preservation cover; during rough rolling, the billet is rolled for 7 passes at a rolling speed of 3m / s-6m / s; the first pass reduction rate is 29.22%-31.51%; the second pass reduction rate is 27.73%-29.24%; the third pass reduction rate is 26.73%-28.24%; the fourth pass reduction rate is 25.27%-27.83%; the fifth pass reduction rate is 24.79%-26.87%; the sixth pass reduction rate is 23.23%-25.38%; the seventh pass reduction rate is 21.45%-22.82%; 4) Finishing rolling: The finishing rolling adopts hot continuous rolling. The billet after rough rolling is transferred into the finishing rolling mechanism. The finishing rolling adopts speed increase rolling, and the pressure AGC is used. The starting temperature of the finishing rolling is set at 1050℃-1125℃; the finishing temperature is greater than 900℃; 5) Coiling after cooling: After finishing rolling, the stainless steel is quickly cooled and the cooled stainless steel plate is coiled; 6) Uncoiling and welding: Uncoiling the stainless steel coil and welding and fixing two adjacent sets of steel plates through welding mechanism; 7) Annealing: The stainless steel strip is annealed at a temperature of 875°C-1150°C by an annealing mechanism; 8) Cooling: After the annealing is completed, the stainless steel plate enters the treatment box in the cooling device along the direction indicated by the arrow in Figure 1. The stainless steel plate is first in the air cooling box at the inlet, and the temperature of the stainless steel plate is reduced to 687°C-700°C by a set of air cooling devices; then the stainless steel plate enters the water cooling box, and the water cooling device quickly reduces the temperature of the stainless steel plate to 276°C-412°C through cooling water, and finally enters the air cooling box at the outlet of the treatment box, and the stainless steel plate is cooled to 65°C-110°C by another set of air cooling devices; 9) Pickling after phosphorus breaking; Shot blast the stainless steel strip at a speed of 15M / min-25M / min through a shot blasting device with a blasting head current of 100A, and then send it into the pickling tank for pickling; 10) Coiling: The pickled stainless steel plate is transported into the cleaning device for cleaning, then the moisture on the stainless steel plate is dried and the stainless steel plate is coiled.

2. The high plastic formability austenitic stainless steel hot-rolled plate and its production method according to claim 1, characterized in that The cooling device in step 8) includes a processing box, an air cooling device, and a water cooling device; a plurality of transport rollers are arranged in the processing box, and two groups of partitions arranged inside the processing box divide the processing box into a water cooling box and two groups of air cooling boxes, and a plurality of inspection doors are respectively arranged on one side of the water cooling box and the two groups of air cooling boxes, and a drain port is arranged at the bottom of the other side of the water cooling box; the air cooling device is provided with two groups, which are respectively arranged in the two groups of air cooling boxes; the water cooling device is arranged in the water cooling box; The air cooling device includes a baffle I, a baffle II, an electric push cylinder I, a gas conveying mechanism I, a gas conveying mechanism II, a wind shield mechanism, and an electric push cylinder II; the gas conveying mechanism I is provided with two groups, which are respectively fixedly connected to both sides of the baffle I, and the cylinder bodies of several groups of electric push cylinders II are symmetrically fixed on the side walls on both sides of the air cooling box through a connecting seat, and the extended ends are respectively fixedly connected to the two ends of the gas conveying mechanism I; the gas conveying mechanism II is provided with two groups, which are respectively fixedly connected to both sides of the baffle II, and the cylinder bodies of several electric push cylinders I are symmetrically fixed on the side walls on both sides of the air cooling box through a connecting seat, and the extended ends are respectively fixedly connected to the two ends of the baffle II; the wind shield mechanism is slidably connected between the gas conveying mechanism I and the gas conveying mechanism II; The water cooling device includes a water tank, a water inlet pipe I, a connecting pipe IV, a connecting pipe V, a cooling mechanism, a protective cover, a cooling mechanism, and a water inlet pipe III; a water outlet trough is provided at the bottom of the water tank, a motor III is provided on the outside, and a lead screw III is rotatably connected inside, and the sprocket on the output end of the motor III is connected to the sprocket on the lead screw III through a chain, and the threads at both ends of the lead screw III turn in opposite directions; a pair of sealing plates II are symmetrically arranged on both sides of the water tank, and the top of the sealing plate II is threadedly connected to the lead screw III, and the bottom is slidably connected to a guide rod fixedly connected to the inside of the water tank; one side of the water inlet pipe I is fixedly connected to the water tank, and the other side is fixedly connected to the connecting pipe III fixedly connected to the top of the water cooling box through a hose, and one end of the connecting pipe III is connected to the liquid cooling device through a hose; the cooling mechanism The structure is provided with two groups, which are fixedly connected to both sides of the water tank; the connecting pipe IV and the connecting pipe V are respectively located on both sides of the connecting pipe III and are fixedly connected to the water cooling box, and the top of the connecting pipe IV is connected to the water inlet of the cooling equipment through a hose, and the top of the connecting pipe V is connected to the water outlet of the cooling equipment through a hose; the protective cover is provided with a pair, which are respectively fixedly connected to both sides of the water cooling box, and the cylinder bodies of the two groups of electric push cylinders IV are located on the inner side of the protective cover and are fixedly connected to the water cooling box, and the protruding ends pass through the through holes on the protective cover and are fixedly connected to the support plate arranged at the bottom of the cooling mechanism; one side of the water inlet pipe III is fixedly connected to the cooling mechanism, and the other side is connected to the connecting pipe VI fixedly connected to the side wall of the water cooling box through a hose, and one end of the connecting pipe VI is connected to the liquid cooling equipment through a hose.

3. The high plastic formability austenitic stainless steel hot-rolled plate and its production method according to claim 2, characterized in that The gas conveying mechanism I is provided with a connecting pipe I, an air box, a conveying pipe, a rotating roller I, a connecting plate, a baffle plate, and a slide groove; one side of the air box is fixedly connected to the baffle plate I, and the other side is rotatably connected to the rotating roller I, and both ends of the air box are fixedly connected to the protruding ends of the electric push cylinder II; one side of the conveying pipe is fixedly connected to the top of the air box, and the other side is fixedly connected to the connecting pipe I fixedly connected to the air cooling box through a hose; a number of baffle plates are provided, which are slidingly connected to the slide grooves at both ends of the air box through sliding shafts, adjacent baffle plates are rotatably connected together, and the baffle plates at both ends are respectively rotatably connected to the connecting plates rotatably connected to one end of the air box and the wind shield mechanism; and one group of gas conveying mechanisms I in the two groups of gas conveying mechanisms I is connected to the air outlet of the gas cooling device through the connecting pipe I, and the other group of gas conveying mechanisms I is connected to the air inlet of the gas cooling device through the connecting pipe I.

4. The high plastic formability austenitic stainless steel hot-rolled plate and its production method according to claim 2, characterized in that The gas delivery mechanism II is provided with a connecting pipe II, a connecting box, a motor I, a screw I, a sealing plate I, a shunt pipe, an air pipe, a guide block, a telescopic mechanism, and a shielding mechanism; one side of the connecting box is fixedly connected to the baffle II, and the other side is provided with a shielding mechanism; the screw I is rotatably connected to one side of the connecting box, and the threads on both sides of the screw I are in opposite directions; the motor I is fixedly connected to the bottom of the connecting box through a motor seat, and the sprocket on the output end of the motor I is connected to the sprocket on the screw I through a chain; a number of air pipes are rotatably connected to the telescopic mechanism, and the telescopic mechanism is slidably connected to the sealing Between plate I and the connection box, a pair of sealing plates I are respectively threadedly connected to both sides of the lead screw I, and a guide block is provided on one side of the sealing plate I; the shunt pipe is fixedly connected to the bottom of the connection box, and a number of interfaces on one side of the shunt pipe are respectively connected to a number of air pipes through hoses, and the interface on the other side is fixedly connected to a connecting pipe II fixedly connected to the side wall of the air cooling box through a hose; and one group of gas conveying mechanisms II in the two groups of gas conveying mechanisms II is connected to the air outlet of the gas cooling device through the connecting pipe II, and the other group of gas conveying mechanisms II is connected to the air inlet of the gas cooling device through the connecting pipe II.

5. The high plastic formability austenitic stainless steel hot-rolled plate and its production method according to claim 2, characterized in that The wind shielding mechanism is provided with a motor II, a lead screw II, a baffle III and a guide shaft; the motor II is fixedly connected to an air box in a group of gas conveying mechanisms I through a motor seat, the lead screw II with opposite thread directions on both sides is located on one side of the motor II and is rotatably connected to support frames arranged at both ends of the air box, and the sprocket on the output end of the motor II is connected to the sprocket on the lead screw II through a chain; the guide shaft is arranged on one side of another group of gas conveying mechanisms I, and both ends of the guide shaft are fixedly connected to support frames arranged at both ends of the air box; a pair of baffles III are symmetrically arranged between the baffle I and the baffle II, one end of the pair of baffles III is symmetrically threaded on both sides of the lead screw II, and the other end is slidably connected to the guide shaft, and the baffle III extends into the air box from the air port at the bottom of the air box through the connecting plate and is rotatably connected to the connecting plate.

6. The high plastic formability austenitic stainless steel hot rolled plate and its production method according to claim 4, characterized in that The telescopic mechanism is provided with a connecting rod I, a connecting rod II, a sliding seat I, a connecting tube, and a sliding seat II; the connecting rods I and II are provided with a plurality of connecting tubes with air pipes on the inner side, which are rotatably connected in the middle of the connecting rods I and II, and the two ends of the connecting rod I are respectively rotatably connected to one end of the other two connecting rods II, and the two ends of the connecting rod II are respectively rotatably connected to one end of the other two connecting rods I; the sliding seat II is provided with a pair, one side of the sliding seat II is slidably connected to the guide block, and the other side is rotatably connected to one end of the connecting rod II located at the outermost end; the sliding seat I is provided with a pair, the sliding seat I is located on the inner side of the sealing plate I and is slidably connected to the sliding groove on the connecting box, and one side of the sliding seat I is rotatably connected to one end of the connecting rod I located at the outermost end.

7. The high plastic formability austenitic stainless steel hot rolled plate and its production method according to claim 4, characterized in that The shielding mechanism is provided with a lifting seat, a rotating roller II, a limiting rod, a connecting box, and a spring; both ends of the limiting rod are fixedly connected to the connecting box, the bottom of the lifting seat passes through between the connecting box and the limiting rod, and is slidably connected to a plurality of connecting boxes with springs inside through a plurality of sliding rods, one side of the connecting box is fixedly connected to the connecting box, and the rotating roller II is arranged on the top of the lifting seat.

8. The high plastic formability austenitic stainless steel hot-rolled plate and its production method according to claim 2, characterized in that The cooling mechanism is provided with a cooling box, an electric push cylinder III, a water outlet pipe, a water inlet pipe II, and a rotating roller III; one side of the cooling box is fixedly connected to the water tank, and the other side is provided with a rotating roller III; the water outlet pipe and the water inlet pipe II are diagonally fixedly connected to the water tank, and one end of the water inlet pipe II is connected to the connecting pipe V through a hose, and one end of the water outlet pipe is connected to the connecting pipe IV through a hose; the electric push cylinder III is provided with a plurality of them, and the cylinder body of the electric push cylinder III is symmetrically fixed on both sides of the water cooling box through a connecting seat, and the protruding end is fixedly connected to both ends of the water tank.

9. The high plastic formability austenitic stainless steel hot-rolled plate and its production method according to claim 2, characterized in that The cooling mechanism is provided with a support box, a sliding plate I, a sliding groove I, a sliding groove II, a sliding plate II, a sliding plate III, a guide rod, a motor IV, and a lead screw IV; a pair of support plates are symmetrically fixed at the bottom of the support box, one side is provided with a guide rod, and the other side is rotatably connected with a lead screw IV, and the threads on both sides of the lead screw IV turn in opposite directions; the motor IV is fixedly connected to a protective box arranged at the bottom of the support box, the output end of the motor IV passes through the through hole on the protective box and is fixedly connected to the sprocket, and the sprocket on the motor IV is connected to the sprocket on the lead screw IV through a chain; the sliding groove I and the sliding groove II are located on both sides of the water storage tank on the support box and are fixedly connected to the support box; the sliding plate I is provided with a pair, which are slidably connected to the two ends of the support box respectively, one end of the sliding plate II and the sliding plate III is fixedly connected to the sliding plate I, and the other end is slidably connected to the sliding groove I and the sliding groove II respectively, and one side of the sliding plate I is threadedly connected to the lead screw IV, and the other side is slidably connected to the guide rod.

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