A production process for 630 precipitation hardening stainless steel hot-rolled strip

Abstract

The present invention discloses a production process for precipitation-hardening stainless steel 630 hot continuous rolling strip steel, and the specific process steps are as follows: 1) Heating; 2) High-pressure water descaling; The scale on the surface of the heated billet is removed by high-pressure water; 3) Rough rolling; The heated billet is conveyed to the rough rolling mill through the transfer rolls, and a corresponding heat preservation cover is provided on the conveying device; 4) Flying shear cutting of the head and tail; Defects such as warping formed at both ends of the billet after rough rolling are cut off; 5) Finish rolling; The finish rolling adopts hot continuous rolling. The billet enters the finish rolling mechanism through transmission. The finish rolling adopts speed-up rolling, and pressure AGC is put into use; 6) Coiling; After finish rolling, it is sent to the coiling mechanism for coiling. The present invention can use multiple cooling methods to cool the blade without affecting the temperature of the billet, and further improve the quality of the strip steel after hot continuous rolling.

Description

Technical Field

[0001] The present invention belongs to the technical field of hot continuous rolling of stainless steel, and particularly relates to a production process for hot continuous rolling strip steel of precipitation hardening stainless steel 630. Background Art

[0002] SUS630 is a martensitic precipitation hardening stainless steel, which has high strength, high hardness, good welding performance and corrosion resistance. The precipitation hardening martensitic stainless steel composed of copper, niobium and columbium has a low carbon content, and its corrosion resistance and weldability are better than those of general martensitic stainless steels; after the SUS630 steel billet is heated and rough rolled, there will be poor conditions such as curling and tail flicking at both ends, so it is necessary to use a flying shear to cut off the defects at both ends of the steel billet so that the steel billet can smoothly enter the finishing mill; however, when the steel billet enters the flying shear, the temperature is usually above 1000°C. When the blade of the flying shear cuts the steel billet, the temperature transferred from the steel billet to the blade and the temperature generated by the friction during blade cutting will not only soften the cutting edge of the blade, accelerate the damage of the blade and affect the shearing effect of the blade on the steel billet, but also be transferred to other parts of the flying shear through the blade, causing equipment damage; therefore, the method of spraying coolant is often used to cool the blade of the flying shear, but the coolant will flow onto the steel billet and accelerate the cooling rate of the steel billet. Therefore, a flying shear that does not affect the temperature of the steel billet when cooling the blade is needed;

[0003] According to the search, for a steel strip rolling equipment with the patent number 202210544682.7, the hanging bracket inside the device is movably arranged on the support bracket, and the top bracket is movably arranged on the hanging bracket by means of a moving component; the number of the first power machines is several, and the first power machines are movably arranged on the top bracket and electrically connected to the control unit; the number of the second power machines is several, and the second power machines are movably arranged on the top bracket and electrically connected to the control unit, and the second power machines and the first power machines are inclined; the cutting knife is fixedly connected to the first power machines and the second power machines; this device can solve the problem that the force-bearing mechanism of the cutting knife is deformed and bent due to long-term local stress during the head and tail cutting operation of the rolled billet; however, this device cannot cool the blade of the flying shear, so the blade needs to be replaced frequently and the equipment needs to be overhauled; for a high-precision flying shear with the patent number 202022405114.8, the shearing device is electrically connected to the controller; a hot metal detector one is installed below one end of the conveying device; a guiding and buffering device is installed at one end of the shearing device; a hot metal detector two is installed below one end of the conveying device two; ball screw pairs are symmetrically installed on both sides of the conveying device two, a cylinder box is installed on the slider of the ball screw pair, the ball screw pair is connected to the transmission box, and the transmission box is connected to a motor three that is electrically connected to the controller. This device can prevent the sheet from shifting during processing, perform shearing according to the conveying rate of the sheet, and cool the cutting knife at the same time; this device cools the blade by means of air nozzles, but the blade cuts frequently, and the single cooling method has a slow cooling rate, and there is still a risk of failure of the blade and the overall device. Summary of the Invention

[0004] The object of the present invention is to overcome the deficiencies in the prior art and provide a production process for precipitation hardening stainless steel 630 hot continuous rolling strip steel. The present invention can cool the blade by multiple cooling methods without affecting the temperature of the steel billet, and further improve the quality of the strip steel after hot continuous rolling.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A production process for precipitation hardening stainless steel 630 hot continuous rolling strip steel, and its specific process steps are as follows:

[0007] 1) Heating; the heating step is divided into a preheating section, a first heating section, a second heating section, and a soaking section; the temperature of the preheating section is controlled at 1037°C - 1057°C; after the preheating section is completed, it enters the first heating section for heating, and the temperature is controlled at 1067°C - 1096°C; after the first heating section is completed, it enters the second heating section for heating, and the temperature is controlled at 1172°C - 1200°C; after the second heating section is completed, it enters the soaking section, and the temperature is controlled at 1193°C - 1215°C;

[0008] 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;

[0009] 3) Rough rolling; the heated steel billet is conveyed to the rough rolling mill through the transfer roller, and a corresponding heat preservation cover is provided on the conveying device; during rough rolling, the steel billet is rolled for 7 passes, the reduction rate of the first pass is 16.44% - 18.71%; the reduction rate of the second pass is 19.21% - 21.34%; the reduction rate of the third pass is 19.21% - 21.34%; the reduction rate of the fourth pass is 21.72% - 22.83%; the reduction rate of the fifth pass is 22.97% - 23.86%; the reduction rate of the sixth pass is 23.91% - 24.33%; the reduction rate of the seventh pass is 24.45% - 25.16%;

[0010] 4) Flying shear cuts the head and tail; cut off the defects such as the warping formed at both ends of the steel billet after rough rolling, so that the steel billet can smoothly enter the finishing area;

[0011] In step 4), the flying shear includes an upper knife rest, a lower knife rest, a purging device, and a supporting device; the upper knife rest is slidably connected above the supporting device; the lower knife rest is fixedly connected below the supporting device; the purging device is slidably connected inside the upper knife rest and the lower knife rest;

[0012] The upper tool rest includes a housing Ⅰ, a water outlet groove, a guide rail, a partition board, a rack Ⅰ, a slider, a water guide groove Ⅰ, a guide plate, a cooling mechanism, a cylinder Ⅰ, an air inlet pipe Ⅰ, a water inlet pipe, an atomizing nozzle, a double-layer pipe, a cylinder Ⅱ, a guide plate Ⅰ, a connecting rod Ⅰ, a connecting rod Ⅱ, a connecting rod Ⅲ, a cylinder Ⅲ, a connecting seat Ⅰ, a fixing seat, a cylinder Ⅳ, a blade, a gear Ⅰ, and a connecting shell; a through groove is provided at the bottom of the housing Ⅰ, and water guide grooves Ⅰ and grooves are provided on both sides. The top of the housing Ⅰ is fixedly connected to the extending end of a cylinder Ⅵ; the guide plate is fixedly connected to both sides of the through groove at the bottom of the housing Ⅰ, and a plurality of through grooves are provided on the guide plate; the guide rail is fixedly connected to the top of the housing Ⅰ; the connecting shell is provided with water guide grooves corresponding to the water guide grooves Ⅰ on both sides, and a through hole is provided at the top. There are a pair of connecting shells, which are respectively fixedly connected to both ends of the housing Ⅰ; there are a pair of partition boards, which are respectively fixedly connected between the housing Ⅰ and the connecting shell, and through grooves are provided in the middle and on both sides of the partition board; there are a pair of racks Ⅰ, which are respectively fixedly connected to one side of the through grooves in the middle of a pair of partition boards; there are a pair of sliders, which are respectively fixedly connected above a pair of connecting shells, and the sliders are slidably connected to the sliding grooves above the bracket; there are a pair of water outlet grooves, which are symmetrically and fixedly connected to one side of a connecting shell, and the water outlet grooves are communicated with the water guide grooves in the connecting shell; there are a pair of cylinders Ⅱ, which are respectively fixedly connected to a pair of connecting shells. The extending ends of the pair of cylinders Ⅱ are respectively provided with connecting seats rotatably connected to the connecting shafts at both ends of the blade, and a plurality of fixing holes are provided on the blade; there are a pair of gears Ⅰ, which are respectively fixedly connected to the connecting shafts at both ends of the blade, and the gears Ⅰ are engaged with the racks Ⅰ; there are a pair of fixing seats, which are respectively slidably connected to both sides of a pair of guide plates through cylinders Ⅳ fixedly connected to the housing Ⅰ, and a plurality of fixing columns corresponding to the through grooves on the guide plates are provided on one side of the fixing seats. A plurality of through grooves are provided on the guide plate Ⅰ. There are a pair of guide plates Ⅰ, which are respectively rotatably connected above the water guide grooves Ⅰ on both sides of the housing Ⅰ; there are two pairs of cylinders Ⅲ, which are respectively arranged inside a pair of connecting shells. A pair of cylinders Ⅲ are symmetrically connected to the connecting shell through a connecting plate, and the extending ends of the cylinders Ⅲ are provided with connecting shafts; the connecting seat Ⅰ is fixedly connected to the connecting shaft at the extending end of the cylinder Ⅲ, and one end of the connecting rod Ⅰ is rotatably connected to the connecting seat Ⅰ; one end of the connecting rod Ⅱ is rotatably connected to the other end of the connecting rod Ⅰ, and the other end of the connecting rod Ⅱ is rotatably connected to one end of the connecting rod Ⅲ. One side of the connecting rod Ⅱ is rotatably connected to the partition board through a connecting shaft; the other end of the connecting rod Ⅲ is rotatably connected to one end of the guide plate Ⅰ located in the water guide groove Ⅰ through a connecting shaft passing through the through grooves on both sides of the partition board.

[0013] There are two sets of the cooling mechanism, symmetrically connected to the top of the outer shell Ⅰ. The cooling mechanism includes cylinder Ⅰ, intake pipe Ⅰ, water inlet pipe, atomizing nozzle, and double-layer pipe. There are a pair of cylinder Ⅰ, respectively fixed to both ends of the top of the outer shell Ⅰ, and a connecting ring is provided on the extending end of cylinder Ⅰ. Both ends of the double-layer pipe are fixedly connected to the connecting ring on the extending end of cylinder Ⅰ. The outer side of the double-layer pipe is the intake pipe, and the inner side is the water inlet pipe. There are several air outlet pipes on the intake pipe on the outer side of the double-layer pipe, and the air inlet is fixedly connected to one end of the intake pipe on the outer side of the double-layer pipe. The water inlet passes through the other end of the intake pipe on the outer side of the double-layer pipe and is fixedly connected to the water inlet pipe on the inner side of the double-layer pipe. There are several atomizing nozzles, and the atomizing nozzles pass through the air outlet pipes on the intake pipe on the outer side of the double-layer pipe and are fixedly connected to the water inlet pipe on the inner side of the double-layer pipe. The intake pipe Ⅰ and the water inlet pipe are both flexible hoses. One end of the intake pipe Ⅰ is fixedly connected to the air inlet on the double-layer pipe, and the other end passes through the partition on one side of the outer shell Ⅰ and the through hole on the top of the connecting shell and is connected to the gas source. One end of the water inlet pipe is fixedly connected to the water inlet on the double-layer pipe, and the other end passes through the partition on the other side of the outer shell Ⅰ and the through hole on the top of the connecting shell and is connected to the coolant source.

[0014] The lower tool rest includes a roller, outer shell Ⅱ, a material baffle, a water outlet pipe, and guide plate Ⅱ. The difference between the lower tool rest and the upper tool rest is that through grooves are provided on both sides of the outer shell Ⅱ, the material baffle is fixedly connected to the bottom of the through grooves on both sides of the outer shell Ⅱ, and the guide plate Ⅱ is rotatably connected above the material baffle. There are several rollers, evenly rotatably connected to the outer shell Ⅱ. The bottom of the outer shell Ⅱ is fixedly connected to the support seat, and there are several water outlet pipes. The water outlet pipes pass through a pair of grooves on the support seat and are fixedly connected to the bottom of the outer shell Ⅱ.

[0015] The purging device includes a sliding seat, a connecting seat II, a rack II, a cylinder V, a telescopic rod, a connecting frame, a connecting seat III, a guide rod, a rotating shaft, a connecting rod, a gear II, a rolling brush, an air inlet pipe II, a gear III, a gear IV, a connecting pipe I, a rotating joint, a connecting pipe II, and a motor; the sliding seat is slidably connected to the guide rail, grooves are provided on both sides of the sliding seat, and rollers are provided in the grooves on both sides of the sliding seat; the connecting seat II is fixedly connected to the outside of the sliding seat, and chutes are provided on both sides of the connecting seat II; the motor is fixedly connected to one side of the connecting seat II through a motor seat, a protective shell is provided outside the motor, and the output end of the motor passes through the through holes in the connecting seat II and the sliding seat and is fixedly connected to the roller in the groove on one side of the sliding seat; there are two pairs of telescopic rods, which are respectively slidably connected to the chutes on both sides of the connecting seat II through sliders, the bottom of the telescopic rod is fixedly connected to the connecting frame, and two sets of racks are provided on the connecting frame; there is a pair of rack II, which are respectively fixedly connected to both sides of the connecting seat II, and a chute is provided at the bottom of the rack II; there are several cylinders V, and one end of the cylinder V is fixedly connected to the bottom of the connecting seat II, the extending end of the cylinder V is fixedly connected to the connecting seat III, and guide rods slidably connected to the chutes at the bottom of the rack II are provided on both sides of the connecting seat III, and a pair of through holes are provided in the middle; there is a pair of rotating shafts, which are respectively rotatably connected to both sides of the connecting seat III, a gear II is provided on each of the pair of rotating shafts, and the gear II meshes with the rack below the connecting frame; there are two pairs of connecting rods, the tops of the two pairs of connecting rods are respectively fixedly connected to a pair of rotating shafts, and the bottom ends of the connecting rods are rotatably connected to a rolling brush uniformly distributed with bristles and a scraper through a connecting shaft; the connecting pipe I and the connecting pipe II are fixedly connected in a cross shape, and an air inlet pipe connecting to the outside air source is provided at the connection of the connecting pipe I and the connecting pipe II; nozzles are provided at both ends of the connecting pipe I, and the nozzles at both ends of the connecting pipe I are fixedly connected in a pair of through holes in the middle of the connecting seat III; both ends of the connecting pipe II are connected to the rotating joint, and a pair of air inlet pipes II are respectively connected to the rotating joint, and several nozzles are provided on the air inlet pipe II; there is a pair of gear III and gear IV, which are respectively fixedly connected to a pair of air inlet pipes II, and the gear III meshes with the rack II, and the gear IV meshes with the rack above the connecting frame.

[0016] The supporting device includes a supporting seat, a conveying roller, a cylinder VI, and a bracket; chutes are provided on the supporting columns on both sides of the bracket, and the bottom of the bracket is fixedly connected to the supporting seat provided with a pair of grooves; there are several cylinders VI, which are uniformly fixed on the top of the bracket; the conveying roller is rotatably connected to both sides of the bracket through a support frame.

[0017] 5) Finish rolling; Hot tandem rolling is adopted for finish rolling. The steel billet enters the finish rolling mechanism through transmission. Ascending speed rolling is adopted for finish rolling. The finish rolling starting temperature is set at 1040°C - 1060°C; The finish rolling ending temperature > 900°C;

[0018] 6) Coiling; After finish rolling, it is sent to the coiling mechanism for coiling.

[0019] The beneficial effects of the present invention compared with the prior art are as follows:

[0020] 1) By controlling the lifting of cylinder VI, the upper tool rest and the lower tool rest can be controlled to complete the shearing of the billet; the telescopic movement of cylinder II controls the rising or falling of the blade, and at the same time, the meshing of gear I and rack I controls the upward or downward flipping of the blade; when cylinder IV extends, it pushes the fixed seat close to the guide plate, and the fixing column on the fixed seat passes through the through slot on the guide plate and inserts into the fixing hole on the blade to fix the blade; when cylinder IV retracts, the fixing column on the fixed seat is removed from the fixing hole on the blade, and then cylinder II is controlled to retract, so that the connecting seat at the extending end of cylinder II drives the blade to rise. During the rising process, the meshing of gear I and rack I controls the upward flipping of the blade, so that the blade is close to the position of the purging device.

[0021] 2) When cylinder III extends, the connecting seat I controls the connecting rod I to pull the connecting rod II, so that the connecting rod II rotates around the connection point of the connecting rod II and the partition plate, thereby pulling the connecting rod III upward to control the closing of a pair of guide plates I, guiding the coolant flowing down from the blade into the guide water groove I, and then discharging it through the guide water grooves corresponding to the guide water groove I on both sides of the connecting shell through the water outlet groove, preventing the coolant from dripping onto the billet and accelerating the temperature drop of the billet; when using the cooling mechanism to cool the blade received in the housing I, the outer intake pipe of the double-layer pipe sends air in the direction of the blade through the outlet pipe, and at the same time, the coolant atomized by the atomizing nozzle is blown towards the blade to perform double cooling on the blade.

[0022] 3) The guide plate II pours impurities such as scale falling into the housing II into the through slots on both sides of the housing II, and finally removes them from the housing II through the baffle plate; when cylinder V drives the connecting seat III to rise and fall, the guide rod slides in the chute at the bottom of the rack II, playing a role in assisting in fixing the rack II to prevent the rack II from breaking and tilting due to external force; the nozzles at both ends of the connecting pipe I can cool the cutting edge of the blade while cleaning the impurities on the cutting edge of the blade.

[0023] 4) The telescopic movement of cylinder V controls the rising or falling of the connecting seat III. The meshing of gear III and rack II drives the intake pipe II to flip upward or downward, and at the same time drives the gear IV to rotate and mesh with the rack above the connecting frame to control the sliding of the telescopic rod in the chute on the connecting seat II, so that the rack below the connecting frame drives the gear II to rotate, thereby controlling the rotating shaft to drive the rotary brush to flip upward or downward, making the rotary brush and the intake pipe II parallel or perpendicular to the blade, so that after the purging device completes the work of brushing, water scraping and cold air drying of the blade, the rotary brush and the intake pipe II can be retracted to prevent the purging device from affecting the rising or falling of the blade controlled by cylinder II. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. Figure 1 is a schematic structural diagram of a production process of a precipitation-hardening stainless steel 630 hot continuous rolling strip of the present invention;

[0025] FIG. Figure 2 is FIG.Figure 1 Schematic diagram of the structure of the upper tool rest

[0026] Appendix Figure 3 It is the appendix Figure 2 Enlarged schematic diagram of part A in

[0027] Appendix Figure 4 It is the appendix Figure 1 Schematic diagram of the internal structure of the upper tool rest

[0028] Appendix Figure 5 It is the appendix Figure 1 Schematic diagram of the sectional structure of the upper tool rest

[0029] Appendix Figure 6 It is the appendix Figure 1 Schematic diagram of the structure of the fixed seat in

[0030] Appendix Figure 7 It is the appendix Figure 1 Schematic diagram of the lower tool rest

[0031] Appendix Figure 8 It is the appendix Figure 2 Schematic diagram of the structure of the purging device in

[0032] Appendix Figure 9 It is the appendix Figure 8 Enlarged schematic diagram of part B in

[0033] Appendix Figure 10 It is the appendix Figure 1 Schematic diagram of the connection structure between guide plate I and housing I in

[0034] In the figure: 1. Upper tool rest; 101. Housing I; 1011. Water outlet groove; 1012. Guide rail; 1013. Partition board; 1014. Rack I; 1015. Slide block; 1016. Water guide groove I; 1017. Guide plate; 102. Cooling mechanism; 1021. Cylinder I; 1022. Intake pipe I; 1023. Water inlet pipe; 1024. Atomizing nozzle; 1025. Double-layer pipe; 103. Cylinder II; 104. Guide plate I; 1041. Connecting rod I; 1042. Connecting rod II; 1043. Connecting rod III; 1044. Cylinder III; 1045. Connecting seat I; 105. Fixed seat; 1051. Cylinder IV; 106. Blade; 1061. Gear I; 107. Connecting shell; 2. Lower tool rest; 201. Drum; 202. Housing II; 2021. Material baffle; 203. Water outlet pipe; 204. Guide plate II; 3. Blowing device; 301. Slide seat; 3011. Connecting seat II; 3012. Rack II; 3013. Cylinder V; 302. Telescopic rod; 3021. Connecting frame; 303. Connecting seat III; 3031. Guide rod; 304. Rotating shaft; 3041. Connecting rod; 3042. Gear II; 3043. Brush roller; 305. Intake pipe II; 3051. Gear III; 3052. Gear IV; 306. Connecting pipe I; 3061. Rotating joint; 3062. Connecting pipe II; 307. Motor; 4. Support device; 401. Support seat; 402. Conveyor roller; 403. Cylinder VI; 404. Bracket; 5. Steel billet. Detailed implementation mode

[0035] For the convenience of understanding by those skilled in the art, the technical solution of the present invention will be further specifically described below with reference to the attached Figure 1-10 drawings.

[0036] Example 1:

[0037] A production process for precipitation-hardening stainless steel 630 hot-rolled strip steel, and its specific process steps are as follows:

[0038] 1) Heating; the steel billet heating step is divided into a preheating section, a first heating section, a second heating section, and a soaking section; the temperature of the preheating section is controlled at 1042 °C; after the preheating section is completed, it enters the first heating section for heating, and the temperature is controlled at 1075 °C; after the first heating section is completed, it enters the second heating section for heating, and the temperature is controlled at 1184 °C; after the second heating section is completed, it enters the soaking section, and the temperature is controlled at 1197 °C;

[0039] 2) High-pressure water descaling; the scale on the surface of the heated steel billet is removed by high-pressure water to prevent the scale from having an adverse impact on the surface quality of the steel billet during the rolling process;

[0040] 3) Rough rolling: The heated billet is conveyed to the rough rolling mill by the transfer rolls, and a corresponding heat preservation cover is provided on the conveying device; during rough rolling, the billet is rolled in 7 passes. The reduction rate of the first pass is 18.2%; the reduction rate of the second pass is 20.93%; the reduction rate of the third pass is 20.93%; the reduction rate of the fourth pass is 22.75%; the reduction rate of the fifth pass is 23.66%; the reduction rate of the sixth pass is 24.11%; the reduction rate of the seventh pass is 24.57%;

[0041] 4) Flying shear cuts the head and tail: Cut off the defects such as the warping formed at both ends of the billet after rough rolling, so that the billet can smoothly enter the finish rolling area;

[0042] In step 4), the flying shear includes an upper tool carrier 1, a lower tool carrier 2, a purging device 3, and a support device 4; the upper tool carrier 1 is slidably connected above the support device 4; the lower tool carrier 2 is fixedly connected below the support device 4; the purging device 3 is slidably connected inside the upper tool carrier 1 and the lower tool carrier 2; the upper tool carrier 1 includes a housing Ⅰ 101, a water outlet groove 1011, a guide rail 1012, a partition plate 1013, a rack Ⅰ 1014, a slider 1015, a water guide groove Ⅰ 1016, a guide plate 1017, a temperature reduction mechanism 102, a cylinder Ⅰ 1021, an air inlet pipe Ⅰ 1022, a water inlet pipe 1023, an atomizing nozzle 1024, a double-layer pipe 1025, a cylinder Ⅱ 103, a guide plate Ⅰ 104, a connecting rod Ⅰ 1041, a connecting rod Ⅱ 1042, a connecting rod Ⅲ 1043, a cylinder Ⅲ 1044, a connecting seat Ⅰ 1045, a fixed seat 105, a cylinder Ⅳ 1051, a blade 106, a gear Ⅰ 1061, and a connecting shell 107; a through groove is provided at the bottom of the housing Ⅰ 101, and water guide grooves Ⅰ 1016 and grooves are provided on both sides; the top of the housing Ⅰ 101 is fixedly connected to the extending end of a cylinder Ⅵ 403; by controlling the lifting of the cylinder Ⅵ 403, the upper tool carrier 1 and the lower tool carrier 2 can be controlled to complete the shearing of the steel billet 5; the guide plate 1017 is fixedly connected to both sides of the through groove at the bottom of the housing Ⅰ 101, and a number of through grooves are provided on the guide plate 1017; the guide rail 1012 is fixedly connected to the top of the housing Ⅰ 101; both sides of the connecting shell 107 are provided with water guide grooves corresponding to the water guide grooves Ⅰ 1016, a through hole is provided at the top, and a pair of connecting shells 107 are provided, which are respectively fixedly connected to both ends of the housing Ⅰ 101; a pair of partition plates 1013 are provided, which are respectively fixedly connected between the housing Ⅰ 101 and the connecting shell 107, and through grooves are provided in the middle and on both sides of the partition plate 1013; a pair of racks Ⅰ 1014 are provided, which are respectively fixedly connected to one side of the through grooves in the middle of a pair of partition plates 1013; a pair of sliders 1015 are provided, which are respectively fixedly connected above a pair of connecting shells 107, and the sliders 1015 are slidably connected to the chutes above the bracket 404; a pair of water outlet grooves 1011 are provided, symmetrically fixedly connected to one side of a connecting shell 107, and the water outlet grooves 1011 communicate with the water guide grooves inside the connecting shell 107; a pair of cylinders Ⅱ 103 are provided, which are respectively fixedly connected to a pair of connecting shells 107, and the extending ends of the pair of cylinders Ⅱ 103 are respectively provided with connecting seats rotatably connected to the connecting shafts at both ends of the blade 106, and a number of fixing holes are provided on the blade 106; a pair of gears Ⅰ 1061 are provided, which are respectively fixedly connected to the connecting shafts at both ends of the blade 106, and the gears Ⅰ 1061 are meshed with the rack Ⅰ 1014; the telescopic movement of the cylinder Ⅱ 103 controls the rising or falling of the blade 106, and at the same time, the meshing of the gear Ⅰ 1061 and the rack Ⅰ 1014 controls the upward or downward flipping of the blade 106;There are a pair of the fixing bases 105, which are respectively slidably connected to both sides of a pair of guide plates 1017 through air cylinders Ⅳ1051 fixedly connected to the housing Ⅰ101. And a number of fixing columns corresponding to the through grooves on the guide plates 1017 are provided on one side of the fixing bases 105. When the air cylinders Ⅳ1051 extend, they push the fixing bases 105 close to the guide plates 1017, and the fixing columns on the fixing bases 105 pass through the through grooves on the guide plates 1017 and insert into the fixing holes on the blades 106 to fix the blades 106; when the air cylinders Ⅳ1051 retract, the fixing columns on the fixing bases 105 are withdrawn from the fixing holes on the blades 106, and then control the air cylinder Ⅱ103 to retract, so that the connecting seat at the extending end of the air cylinder Ⅱ103 drives the blade 106 to rise. During the rising process, the gear Ⅰ1061 meshes with the rack Ⅰ1014 to control the blade 106 to turn upwards, so that the blade 106 approaches the position of the purging device 3; a number of through grooves are provided on the guide plate Ⅰ104, and there are a pair of the guide plate Ⅰ104, which are respectively rotatably connected above the water guide grooves Ⅰ1016 on both sides of the housing Ⅰ101; there are two pairs of the air cylinders Ⅲ1044, which are respectively arranged inside a pair of connecting shells 107. A pair of air cylinders Ⅲ1044 are symmetrically connected to the connecting shells 107 through connecting plates, and a connecting shaft is provided at the extending end of the air cylinders Ⅲ1044; the connecting seat Ⅰ1045 is fixedly connected to the connecting shaft at the extending end of the air cylinders Ⅲ1044, and one end of the connecting rod Ⅰ1041 is rotatably connected to the connecting seat Ⅰ1045; one end of the connecting rod Ⅱ1042 is rotatably connected to the other end of the connecting rod Ⅰ1041, the other end of the connecting rod Ⅱ1042 is rotatably connected to one end of the connecting rod Ⅲ1043, and one side of the connecting rod Ⅱ1042 is rotatably connected to the partition plate 1013 through a connecting shaft; the other end of the connecting rod Ⅲ1043 passes through the through grooves on both sides of the partition plate 1013 through a connecting shaft and is rotatably connected to one end of the guide plate Ⅰ104 located in the water guide groove Ⅰ1016; when the air cylinders Ⅲ1044 extend, the connecting seat Ⅰ1045 controls the connecting rod Ⅰ1041 to pull the connecting rod Ⅱ1042, so that the connecting rod Ⅱ1042 rotates around the connection point of the connecting rod Ⅱ1042 and the partition plate 1013, thereby pulling the connecting rod Ⅲ1043 upwards to control a pair of guide plates Ⅰ104 to close, guiding the coolant flowing down from the blades 106 into the water guide groove Ⅰ1016, and then discharging it through the water guide grooves corresponding to the water guide groove Ⅰ1016 on both sides of the connecting shell 107 by the water outlet groove 1011, preventing the coolant from dripping onto the billet 5 and accelerating the temperature drop of the billet 5.;

[0043] There are two sets of the cooling mechanism 102, symmetrically connected to the top of the outer shell Ⅰ 101. The cooling mechanism 102 includes a cylinder Ⅰ 1021, an air inlet pipe Ⅰ 1022, a water inlet pipe 1023, an atomizing nozzle 1024, and a double-layer pipe 1025. There are a pair of the cylinders Ⅰ 1021, respectively fixedly connected to both ends of the top of the outer shell Ⅰ 101, and a connecting ring is provided on the extending end of the cylinder Ⅰ 1021. Both ends of the double-layer pipe 1025 are fixedly connected to the connecting rings on the extending ends of the cylinders Ⅰ 1021. The outer side of the double-layer pipe 1025 is the air inlet pipe, and the inner side is the water inlet pipe. A number of air outlet pipes are provided on the air inlet pipe on the outer side of the double-layer pipe 1025, and the air inlet is fixedly connected to one end of the air inlet pipe on the outer side of the double-layer pipe 1025. The water inlet passes through the other end of the air inlet pipe on the outer side of the double-layer pipe 1025 and is fixedly connected to the water inlet pipe on the inner side of the double-layer pipe 1025. There are a number of the atomizing nozzles 1024, and the atomizing nozzles 1024 pass through the air outlet pipes on the air inlet pipe on the outer side of the double-layer pipe 1025 and are fixedly connected to the water inlet pipe on the inner side of the double-layer pipe 1025. Both the air inlet pipe Ⅰ 1022 and the water inlet pipe 1023 are flexible pipes. One end of the air inlet pipe Ⅰ 1022 is fixedly connected to the air inlet on the double-layer pipe 1025, and the other end passes through the partition 1013 on one side of the outer shell Ⅰ 101 and the through hole at the top of the connecting shell 107 to be connected to the air source. One end of the water inlet pipe 1023 is fixedly connected to the water inlet on the double-layer pipe 1025, and the other end passes through the partition 1013 on the other side of the outer shell Ⅰ 101 and the through hole at the top of the connecting shell 107 to be connected to the coolant source. When using the cooling mechanism 102 to cool the blade 106 received in the outer shell Ⅰ 101, the air inlet pipe on the outer side of the double-layer pipe 1025 blows air towards the blade 106 through the air outlet pipes, and at the same time blows the coolant atomized by the atomizing nozzle 1024 towards the blade 106 to perform double cooling on the blade 106.

[0044] The lower tool rest 2 includes a roller 201, an outer shell Ⅱ 202, a baffle 2021, a water outlet pipe 203, and a guide plate Ⅱ 204. The difference between the lower tool rest 2 and the upper tool rest 1 is that through grooves are provided on both sides of the outer shell Ⅱ 202, the baffle 2021 is fixedly connected to the bottom of the through grooves on both sides of the outer shell Ⅱ 202, and the guide plate Ⅱ 204 is rotatably connected above the baffle 2021. The guide plate Ⅱ 204 pours impurities such as scale falling into the outer shell Ⅱ 202 into the through grooves on both sides of the outer shell Ⅱ 202, and finally removes them from the outer shell Ⅱ 202 through the baffle 2021. There are a number of the rollers 201, which are evenly rotatably connected to the outer shell Ⅱ 202. The bottom of the outer shell Ⅱ 202 is fixedly connected to the support seat 401, and there are a number of the water outlet pipes 203. The water outlet pipes 203 pass through a pair of grooves on the support seat 401 and are fixedly connected to the bottom of the outer shell Ⅱ 202.

[0045] The purging device 3 includes a sliding seat 301, a connecting seat II 3011, a rack II 3012, a cylinder V 3013, a telescopic rod 302, a connecting frame 3021, a connecting seat III 303, a guide rod 3031, a rotating shaft 304, a connecting rod 3041, a gear II 3042, a rotary brush 3043, an air inlet pipe II 305, a gear III 3051, a gear IV 3052, a connecting pipe I 306, a rotating joint 3061, a connecting pipe II 3062, and a motor 307; the sliding seat 301 is slidably connected to the guide rail 1012, grooves are provided on both sides of the sliding seat 301, and rollers are provided in the grooves on both sides of the sliding seat 301; the connecting seat II 3011 is fixedly connected to the outside of the sliding seat 301, and chutes are provided on both sides of the connecting seat II 3011; the motor 307 is fixedly connected to one side of the connecting seat II 3011 through a motor seat, a protective shell is provided outside the motor 307, and the output end of the motor 307 passes through the through holes in the connecting seat II 3011 and the sliding seat 301 and is fixedly connected to the roller in the groove on one side of the sliding seat 301; there are two pairs of telescopic rods 302, which are respectively slidably connected to the chutes on both sides of the connecting seat II 3011 through sliders, the bottom of the telescopic rod 302 is fixedly connected to the connecting frame 3021, and two sets of racks are provided on the connecting frame 3021; there is a pair of racks II 3012, which are respectively fixedly connected to both sides of the connecting seat II 3011, and a chute is provided at the bottom of the rack II 3012; there are several cylinders V 3013, and one end of the cylinder V 3013 is fixedly connected to the bottom of the connecting seat II 3011, the extending end of the cylinder V 3013 is fixedly connected to the connecting seat III 303, and guide rods 3031 slidably connected to the chutes at the bottom of the rack II 3012 are provided on both sides of the connecting seat III 303, and a pair of through holes are provided in the middle; when the cylinder V 3013 drives the connecting seat III 303 to move up and down, the guide rod 3031 slides in the chute at the bottom of the rack II 3012, which plays a role in assisting in fixing the rack II 3012 and preventing the rack II 3012 from breaking and tilting due to external force; there is a pair of rotating shafts 304, which are respectively rotatably connected to both sides of the connecting seat III 303, a gear II 3042 is provided on each of the pair of rotating shafts 304, and the gear II 3042 meshes with the rack below the connecting frame 3021; there are two pairs of connecting rods 3041, the tops of the two pairs of connecting rods 3041 are respectively fixedly connected to a pair of rotating shafts 304, and the bottom ends of the connecting rods 3041 are rotatably connected to the rotary brush 3043 evenly distributed with bristles and scrapers through a connecting shaft; the connecting pipe I 306 and the connecting pipe II 3062 are fixedly connected in a cross shape, and an air inlet pipe connecting to the outside air source is provided at the connection of the connecting pipe I 306 and the connecting pipe II 3062; a nozzle is provided at each end of the connecting pipe I 306, and the nozzles at both ends of the connecting pipe I 306 are fixedly connected in a pair of through holes in the middle of the connecting seat III 303. The nozzles at both ends of the connecting pipe I 306 can clean the impurities on the cutting heads of the blades 106 and cool the cutting heads of the blades 106 at the same time;Both ends of the connecting pipe II 3062 are connected to the rotary joint 3061, and a pair of intake pipes II 305 are respectively connected to the rotary joint 3061. A number of nozzles are provided on the intake pipe II 305; A pair of gear III 3051 and gear IV 3052 are provided, and are respectively fixedly connected to a pair of intake pipes II 305. The gear III 3051 meshes with the rack II 3012, and the gear IV 3052 meshes with the rack above the connecting frame 3021; The telescopic cylinder V 3013 controls the lifting or lowering of the connecting seat III 303. The meshing of the gear III 3051 and the rack II 3012 drives the intake pipe II 305 to turn up or down, and at the same time drives the gear IV 3052 to rotate and mesh with the rack above the connecting frame 3021 to control the telescopic rod 302 to slide in the chute on the connecting seat II 3011, so that the rack below the connecting frame 3021 drives the gear II 3042 to rotate, thereby controlling the rotating shaft 304 to drive the rotary brush 3043 to turn up or down, so that the rotary brush 3043 and the intake pipe II 305 are parallel or perpendicular to the blade 106, so that after the purging device 3 completes the work of brushing, scraping water and drying with cold air on the blade 106, the rotary brush 3043 and the intake pipe II 305 can be retracted to prevent the purging device 3 from affecting the lifting or lowering of the blade 106 by the cylinder II 103.;

[0046] The support device 4 includes a support seat 401, a transport roller 402, a cylinder VI 403, and a bracket 404; Chutes are provided on the support columns on both sides of the bracket 404, and the bottom of the bracket 404 is fixedly connected to the support seat 401 provided with a pair of grooves; A number of cylinder VI 403 are evenly fixed on the top of the bracket 404; The transport roller 402 is rotatably connected to both sides of the bracket 404 through a support frame.

[0047] 5) Finish rolling; Finish rolling adopts hot continuous rolling. The steel billet enters the finish rolling mechanism through transmission. Finish rolling adopts speed-up rolling. The finish rolling starting temperature is set at 1047 °C; The finish rolling end temperature is 1006 °C; The size of the mechanical experiment sample after rolling is 38 mm × 38 mm;

[0048] 6) Coiling; After finish rolling, it is sent to the coiling mechanism for coiling.

[0049] Example 2:

[0050] The difference compared with Example 1 is:

[0051] 1) Heating; The heating steps are divided into a preheating section, a heating section 1, a heating section 2, and a soaking section; The temperature of the preheating section is controlled at 1051 °C; After the preheating section is completed, it enters the heating section 1 for heating, and the temperature is controlled at 1086 °C; After the heating section 1 is completed, it enters the heating section 2 for heating, and the temperature is controlled at 1193 °C; After the heating section 2 is completed, it enters the soaking section, and the temperature is controlled at 1204 °C;

[0052] 3) Rough rolling: The heated billet is conveyed to the rough rolling mill through the transfer rolls, and a corresponding heat preservation cover is provided on the conveying device; during rough rolling, the billet is rolled in 7 passes. The reduction rate in the first pass is 18.34%; the reduction rate in the second pass is 21.26%; the reduction rate in the third pass is 21.26%; the reduction rate in the fourth pass is 22.46%; the reduction rate in the fifth pass is 23.19%; the reduction rate in the sixth pass is 23.96%; the reduction rate in the seventh pass is 24.69%;

[0053] 5) Finish rolling: Finish rolling adopts hot continuous rolling. The billet enters the finish rolling mechanism through transmission. Finish rolling adopts speed-up rolling. The starting rolling temperature of finish rolling is set at 1058 °C; the ending rolling temperature is 1017 °C;

[0054] Example 3:

[0055] The differences compared with Example 1 are as follows:

[0056] 1) Heating: The heating process is divided into a preheating section, a first heating section, a second heating section, and a soaking section; the temperature of the preheating section is controlled at 1042 °C; after the preheating section is completed, it enters the first heating section for heating, and the temperature is controlled at 1095 °C; after the first heating section is completed, it enters the second heating section for heating, and the temperature is controlled at 1176 °C; after the second heating section is completed, it enters the soaking section, and the temperature is controlled at 1211 °C;

[0057] 3) Rough rolling: The heated billet is conveyed to the rough rolling mill through the transfer rolls, and a corresponding heat preservation cover is provided on the conveying device; during rough rolling, the billet is rolled in 7 passes. The reduction rate in the first pass is 18.65%; the reduction rate in the second pass is 21.17%; the reduction rate in the third pass is 21.17%; the reduction rate in the fourth pass is 21.86%; the reduction rate in the fifth pass is 23.27%; the reduction rate in the sixth pass is 24.31%; the reduction rate in the seventh pass is 24.98%;

[0058] 5) Finish rolling: Finish rolling adopts hot continuous rolling. The billet enters the finish rolling mechanism through transmission. Finish rolling adopts speed-up rolling. The starting rolling temperature of finish rolling is set at 1067 °C; the ending rolling temperature is 1037 °C;

[0059] Comparative Example 1

[0060] The precipitation hardening stainless steel 630 strip is prepared by the method with the application number 202010511297.3 and the invention name "A martensitic precipitation hardening stainless steel and its preparation method and application", and the billet specifications and the size of the mechanical experiment sampling are the same as those in Example 1;

[0061] The measured mechanical properties of the precipitation hardening stainless steel 630 strip after forming in each example and comparative example are shown in the table:

[0062] Tensile strength Mpa Yield strength Mpa Elongation after fracture % Shear strength (MPa) Example 1 483 291 54 515 Example 2 466 284 53.2 509 Example 3 451 277 51 492 Comparative example 1 437 246 49 479

[0063] Through the analysis of the experimental results of Example 1, Example 2, and Example 3, for the rolling production process according to the present invention and the flying shear used in conjunction with the rolling production process, the various mechanical properties of the precipitation-hardening stainless steel 630 strip produced by rolling all meet the production requirements and the experimental data is stable;

[0064] By comparing the experimental data of Example 1, Example 2, Example 3 with that of Comparative Example 1, although all the experimental data meet the production requirements, the data of Comparative Example 1 is significantly lower;

[0065] By observing the production processes of Example 1, Example 2, and Example 3, it is found that for the flying shear used in the rolling production process of the present invention, the service life is extended, and the quality of the precipitation-hardening stainless steel 630 strip formed after finish rolling of the billets with the heads and tails cut off is good and meets the quality control requirements;

[0066] By comparing and analyzing Example 1, Example 2, Example 3 with Comparative Example 1, the quality of the precipitation-hardening stainless steel 630 strip produced by Comparative Example 1 is worse than that of Example 1, Example 2, and Example 3.

[0067] The above content is only an example and illustration of the structure of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar ways to replace them. As long as they do not deviate from the structure of the invention or exceed the scope defined by this claims, they should all fall within the protection scope of the present invention.

Claims

1. A production process for precipitation-hardening stainless steel 630 hot-rolled strip steel, characterized in that The specific process steps are as follows: 1) Heating; the billet heating steps are successively divided into a preheating section, a first heating section, a second heating section, and a soaking section; the temperature of the preheating section is controlled at 1037°C - 1057°C; after the preheating section is completed, it enters the first heating section for heating, and the temperature is controlled at 1067°C - 1096°C; after the first heating section is completed, it enters the second heating section for heating, and the temperature is controlled at 1172°C - 1200°C; after the second heating section is completed, it enters the soaking section, and the temperature is controlled at 1193°C - 1215°C; 2) High-pressure water descaling; the scale on the surface of the heated billet is removed by high-pressure water; 3) Rough rolling; the heated billet is conveyed to the rough rolling mill through the transfer roller, and a corresponding heat preservation cover is provided on the conveying device; 4) Flying shear cutting of the head and tail; defects such as warping formed at both ends after the rough rolling of the billet are cut off, so that the billet can smoothly enter the finish rolling area; 5) Finish rolling; hot continuous rolling is adopted for finish rolling, the billet enters the finish rolling mechanism through transmission, and accelerated rolling is adopted for finish rolling, and the starting temperature of finish rolling is set at 1040°C - 1060°C; the finishing temperature of finish rolling > 900°C; 6) Coiling; after finish rolling, it is sent to the coiling mechanism for coiling; In step 4), the flying shear includes an upper tool rest, a lower tool rest, a purging device, and a supporting device; the upper tool rest is slidably connected above the supporting device; the lower tool rest is fixedly connected below the supporting device; The purging device is slidably connected inside the upper tool rest and the lower tool rest; The supporting device includes a support seat, a transport roller, a cylinder VI, and a bracket; chutes are provided on the support columns on both sides of the bracket, and the bottom of the bracket is fixedly connected to the support seat provided with a pair of grooves; a number of cylinder VIs are evenly fixed on the top of the bracket; the transport roller is rotatably connected to both sides of the bracket through a support frame; The upper tool rest includes a housing Ⅰ, a water outlet groove, a partition plate, a rack Ⅰ, a slider, a water guide groove Ⅰ, a guide plate, a cylinder Ⅱ, a guide plate Ⅰ, a connecting rod Ⅰ, a connecting rod Ⅱ, a connecting rod Ⅲ, a cylinder Ⅲ, a connecting seat Ⅰ, a fixed seat, a cylinder Ⅳ, a blade, a gear Ⅰ, and a connecting shell; a through groove is provided at the bottom of the housing Ⅰ, and water guide grooves Ⅰ and grooves are provided on both sides. The top of the housing Ⅰ is fixedly connected to the extended end of the cylinder Ⅵ; the guide plate is fixedly connected to both sides of the through groove at the bottom of the housing Ⅰ, and a number of through grooves are provided on the guide plate; the connecting shell is provided with water guide grooves corresponding to the water guide grooves Ⅰ on both sides, a through hole is provided at the top, and a pair of connecting shells are provided, which are respectively fixedly connected to both ends of the housing Ⅰ; a pair of partition plates are provided, which are respectively fixedly connected between the housing Ⅰ and the connecting shell, and through grooves are provided in the middle and on both sides of the partition plate; a pair of racks Ⅰ are provided, which are respectively fixedly connected to one side of the through groove in the middle of a pair of partition plates; a pair of sliders are provided, which are respectively fixedly connected above a pair of connecting shells, and the sliders are slidably connected to the chute above the bracket; a pair of water outlet grooves are provided, symmetrically fixedly connected to one side of a connecting shell, and the water outlet grooves are communicated with the water guide grooves in the connecting shell; a pair of cylinders Ⅱ are provided, which are respectively fixedly connected to a pair of connecting shells. The extended ends of the pair of cylinders Ⅱ are respectively provided with connecting seats rotatably connected to the connecting shafts at both ends of the blade, and a number of fixing holes are provided on the blade; a pair of gears Ⅰ are provided, which are respectively fixedly connected to the connecting shafts at both ends of the blade, and the gears Ⅰ are engaged with the racks Ⅰ; a pair of fixed seats are provided, which are respectively slidably connected to both sides of a pair of guide plates through cylinders Ⅳ fixedly connected to the housing Ⅰ, and a number of fixing columns corresponding to the through grooves on the guide plates are provided on one side of the fixed seat. A number of through grooves are provided on the guide plate Ⅰ, and a pair of guide plates Ⅰ are provided, which are respectively rotatably connected above the water guide grooves Ⅰ on both sides of the housing Ⅰ; two pairs of cylinders Ⅲ are provided, which are respectively arranged inside a pair of connecting shells. A pair of cylinders Ⅲ are symmetrically connected to the connecting shell through a connecting plate, and the extended end of the cylinder Ⅲ is provided with a connecting shaft; the connecting seat Ⅰ is fixedly connected to the connecting shaft at the extended end of the cylinder Ⅲ, and one end of the connecting rod Ⅰ is rotatably connected to the connecting seat Ⅰ; one end of the connecting rod Ⅱ is rotatably connected to the other end of the connecting rod Ⅰ, the other end of the connecting rod Ⅱ is rotatably connected to one end of the connecting rod Ⅲ, and one side of the connecting rod Ⅱ is rotatably connected to the partition plate through a connecting shaft; the other end of the connecting rod Ⅲ is rotatably connected to one end of the guide plate Ⅰ located in the water guide groove Ⅰ through a connecting shaft passing through the through grooves on both sides of the partition plate.

2. The production process of a precipitation-hardening stainless steel 630 hot-rolled strip according to claim 1, characterized in that In step 3), during rough rolling, the steel billet is rolled in 7 passes. The reduction ratio in the first pass is 16.44% - 18.71%; the reduction ratio in the second pass is 19.21% - 21.34%; the reduction ratio in the third pass is 19.21% - 21.34%; the reduction ratio in the fourth pass is 21.72% - 22.83%; the reduction ratio in the fifth pass is 22.97% - 23.86%; the reduction ratio in the sixth pass is 23.91% - 24.33%; the reduction ratio in the seventh pass is 24.45% - 25.16%.

3. A production process for precipitation-hardening stainless steel 630 hot-rolled strip according to claim 1, characterized in that The upper tool rest further includes a cooling mechanism. There are two sets of cooling mechanisms, symmetrically connected to the top of the housing I. The cooling mechanism includes a cylinder I, an intake pipe I, a water inlet pipe I, atomizing nozzles, and a double-layer pipe. There is a pair of cylinder I, which are respectively fixedly connected to both ends of the top of the housing I, and a connecting ring is provided on the extending end of the cylinder I. Both ends of the double-layer pipe are fixedly connected to the connecting rings on the extending ends of the cylinder I. The outer side of the double-layer pipe is the intake pipe, and the inner side is the water inlet pipe. A number of air outlet pipes are provided on the intake pipe on the outer side of the double-layer pipe, and the air inlet is fixedly connected to one end of the intake pipe on the outer side of the double-layer pipe. The water inlet passes through the other end of the intake pipe on the outer side of the double-layer pipe and is fixedly connected to the water inlet pipe on the inner side of the double-layer pipe. A number of atomizing nozzles are provided. The atomizing nozzles pass through the air outlet pipes on the intake pipe on the outer side of the double-layer pipe and are fixedly connected to the water inlet pipe on the inner side of the double-layer pipe. The intake pipe I and the water inlet pipe I are both flexible hoses. One end of the intake pipe I is fixedly connected to the air inlet on the double-layer pipe, and the other end passes through the partition on one side of the housing I and the through hole on the top of the connecting shell to be connected to the air source. One end of the water inlet pipe I is fixedly connected to the water inlet on the double-layer pipe, and the other end passes through the partition on the other side of the housing I and the through hole on the top of the connecting shell to be connected to the coolant source.

4. A production process for precipitation-hardening stainless steel 630 hot-rolled strip according to claim 1, characterized in that The purging device includes a sliding seat, a connecting seat II, a rack II, a cylinder V, a telescopic rod, a connecting frame, a connecting seat III, a guide rod, a rotating shaft, a connecting rod, a gear II, a rotary brush, an air inlet pipe II, a gear III, a gear IV, a connecting pipe I, a rotating joint, a connecting pipe II, and a motor; the upper tool rest further includes a guide rail, and the guide rail is fixedly connected to the top of the outer shell I; the sliding seat is slidably connected to the guide rail, grooves are provided on both sides of the sliding seat, and rollers are provided in the grooves on both sides of the sliding seat; the connecting seat II is fixedly connected to the outside of the sliding seat, and chutes are provided on both sides of the connecting seat II; the motor is fixedly connected to one side of the connecting seat II through a motor seat, a protective shell is provided outside the motor, and the output end of the motor passes through the through holes in the connecting seat II and the sliding seat and is fixedly connected to the roller in the groove on one side of the sliding seat; there are two pairs of telescopic rods, which are respectively slidably connected to the chutes on both sides of the connecting seat II through sliders, the bottom of the telescopic rod is fixedly connected to the connecting frame, and two sets of racks are provided on the connecting frame; there is a pair of rack II, which are respectively fixedly connected to both sides of the connecting seat II, and a chute is provided at the bottom of the rack II; there are several cylinders V, and one end of the cylinder V is fixedly connected to the bottom of the connecting seat II, the extending end of the cylinder V is fixedly connected to the connecting seat III, and guide rods slidably connected to the chute at the bottom of the rack II are provided on both sides of the connecting seat III, and a pair of through holes are provided in the middle of the connecting seat III; there is a pair of rotating shafts, which are respectively rotatably connected to both sides of the connecting seat III, a gear II is provided on each of the pair of rotating shafts, and the gear II meshes with the rack below the connecting frame; there are two pairs of connecting rods, the tops of the two pairs of connecting rods are respectively fixedly connected to a pair of rotating shafts, and the bottom ends of the connecting rods are rotatably connected to the rotary brush uniformly distributed with bristles and scraping plates through a connecting shaft; the connecting pipe I and the connecting pipe II are fixedly connected in a cross shape, and an air inlet pipe connecting to the external air source is provided at the connection of the connecting pipe I and the connecting pipe II; a nozzle is provided at each end of the connecting pipe I, and the nozzles at both ends of the connecting pipe I are fixedly connected in a pair of through holes in the middle of the connecting seat III; both ends of the connecting pipe II are connected to the rotating joint, and a pair of air inlet pipes II are respectively connected to the rotating joint, and several nozzles are provided on the air inlet pipe II; there is a pair of gear III and a pair of gear IV, a pair of gear III is fixedly connected to a pair of air inlet pipes II, a pair of gear IV is fixedly connected to a pair of air inlet pipes II, and the gear III meshes with the rack II, and the gear IV meshes with the rack above the connecting frame.

5. A production process of precipitation hardening stainless steel 630 hot continuous rolling strip steel according to claim 1, characterized in that The lower tool rest includes a roller, an outer shell II, a baffle plate, a water outlet pipe, and a guide plate II; the difference between the lower tool rest and the upper tool rest is that through grooves are provided on both sides of the outer shell II, the baffle plate is fixedly connected to the bottom of the through grooves on both sides of the outer shell II, and the guide plate II is rotatably connected above the baffle plate; there are several rollers, which are evenly rotatably connected to the outer shell II; the bottom of the outer shell II is fixedly connected to the support seat, and there are several water outlet pipes, and the water outlet pipes pass through a pair of grooves on the support seat and are fixedly connected to the bottom of the outer shell II.

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