A process for reducing the surface roughness of 10Cr17 stainless steel hot-rolled pickling

Abstract

The invention discloses a process for reducing the surface roughness of 10Cr17 stainless steel hot-rolled pickling, and the process steps are as follows: 1) preparing the steel billet to be heated in a heating furnace; 2) high-pressure water descaling, removing the oxide skin on the surface of the heated steel billet by a high-pressure water jet mechanism; 3) rolling: rough rolling and finishing rolling; 5) coiling: feeding the steel billet into a coiling mechanism for coiling after finishing rolling; 6) uncoiling and welding; 7) annealing: annealing the stainless steel plate by an annealing mechanism, and then cooling; 8) phosphorus-breaking shot blasting: shot blasting the annealed stainless steel plate by a shot blasting machine; 9) pickling: pickling the stainless steel plate by a pickling mechanism to remove the oxide skin; 10) cleaning and drying: cleaning the pickled stainless steel plate by a cleaning mechanism, and then drying the stainless steel plate by a drying system before coiling. The invention can quickly and effectively reduce the roughness of the stainless steel surface.

Description

Technical Field

[0001] The invention belongs to the technical field of stainless steel processing, and particularly relates to a process for reducing the surface roughness of 10Cr17 stainless steel after hot rolling and pickling. Background Art

[0002] Stainless steel has a wide range of applications, so the requirements for its surface roughness vary depending on the purpose. 10Cr17 stainless steel is a general-purpose steel with good corrosion resistance, and is mostly used in household appliance parts, household appliances, etc. Therefore, it has a high requirement for roughness.

[0003] 1) The pickling process of 10Cr17 stainless steel plate is generally (HNO3+HF). During the pickling process, metal ions and F - The fluoride precipitates generated by the combination of ions will accumulate on the stainless steel plate to a certain extent after the oxide scale is removed, making it difficult to clean;

[0004] 2) Secondly, shot blasting is an important process for surface treatment of stainless steel plates. The selection and coordination of steel shot types and sizes will directly affect the surface roughness of stainless steel plates. If the steel shot is too large, the surface roughness after shot blasting will be larger, and if the steel shot is too small, the shot blasting effect will not be achieved. At the same time, during the hot rolling process, the rolling work rolls with different roughness also affect the surface roughness of the stainless steel plate during the rolling process, especially the subsequent finishing process.

[0005] Therefore, the present invention provides a process for reducing the surface roughness of 10Cr17 stainless steel plate from multiple aspects. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a process for reducing the surface roughness of 10Cr17 stainless steel hot-rolled pickling, which can quickly and effectively reduce the surface roughness of the stainless steel.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A process for reducing the surface roughness of 10Cr17 stainless steel hot-rolled pickling, the process steps are as follows:

[0009] 1) Prepare the billet for heating in the heating furnace;

[0010] 2) High-pressure water descaling: the oxide scale on the surface of the heated steel billet is removed by a high-pressure water jet mechanism.

[0011] 3) Rolling: Rough rolling and finishing rolling. The heated billet is transferred to the rough rolling mill through the transfer roller, and the transfer device is provided with a corresponding heat preservation cover; during finishing rolling, the billet is rolled in 7 passes; the first pass reduction rate is 30-32%; the second pass reduction rate is 30-32%; the third pass reduction rate is 24-26%; the fourth pass reduction rate is 24-26%; the fifth pass reduction rate is 24-26%; the sixth pass reduction rate is 20-22%; the seventh pass reduction rate is 20-22%;

[0012] For 1-2 passes, the working roll with a roughness of 3.5-4.0μm is used at a rolling speed of 60-80mpm; for 3-5 passes, the working roll with a roughness of 1.2-1.8μm is used for each rolling, and the rolling speed is 160-180mpm; for 6-7 passes, the working roll with a roughness of 1.6-1.8μm is used for each rolling, and the rolling speed is 250-400mpm.

[0013] 4) Coiling: After finishing rolling, the steel is sent to the coiling mechanism for coiling.

[0014] 5) Uncoiling and welding: The two adjacent sets of stainless steel plates are welded and fixed by welding mechanism to facilitate the overall pickling of the stainless steel plates.

[0015] 6) Annealing: The stainless steel plate is annealed by an annealing mechanism and then cooled.

[0016] 7) Phosphorus-breaking shot blasting: The annealed stainless steel plate is shot blasted by a shot blasting machine.

[0017] The shot blasting medium is high carbon cast steel shot, of which the total amount of steel shot with a particle size of ≥0.4mm is less than 1.8%, and the total amount of steel shot with a particle size of 0.3mm-0.4mm reaches 85-90%;

[0018] 8) Pickling: The stainless steel plate is pickled by a pickling mechanism to remove the oxide scale; the pickling process has a mixed acid stage and a mixed acid stage; the mixed acid stage has an HNO3 concentration of 55-65g / L, an HF concentration of 35-40g / L, metal ions <28g / L, and a temperature of 55-65°C; the mixed acid stage has an HNO3 concentration of 40-50g / L, an HF concentration of 30-35 g / L, metal ions of 25-30g / L, and a temperature of 45-50°C.

[0019] 9) Cleaning and drying: The pickled stainless steel plate is cleaned by the cleaning mechanism, and then dried by the drying system before curling. The cleaning mechanism is equipped with a polishing mechanism, which cooperates with the cleaning liquid to polish the surface of the stainless steel plate to reduce the roughness.

[0020] The polishing mechanism includes a polishing roller, an adjusting mechanism, and a conveying mechanism; the adjusting mechanism is arranged on a supporting frame of the conveying mechanism, a pair of polishing rollers are arranged on the upper and lower sides of the stainless steel plate, the conveying mechanism is located at the position of the polishing roller and is transparent from top to bottom, and no conveying roller shaft is installed, the adjusting mechanism is connected to control the polishing roller, and the distance between the polishing roller and the stainless steel plate is controlled by the adjusting mechanism to perform polishing and grind the roughness.

[0021] The polishing roller includes a roller frame, and fixedly connected sleeves are provided at both ends of the roller frame, and fixed flanges and sprockets are provided at the ends of the sleeves, and a plurality of through grooves are provided on the roller frame; an adjustment frame and a plurality of first polishing parts and second polishing parts distributed at intervals are provided inside the roller frame, and the first polishing part and the second polishing part are arranged in the through grooves; fixed shafts are provided at both ends of the adjustment frame and the two ends of the roller frame are rotatably connected through shaft sleeves, the fixed shaft sleeve is connected to the shaft sleeve, a first flange is provided at one end of the fixed shaft, a first electric push rod is provided on the fixed flange, and a second flange is provided at the end of the top shaft of the first electric push rod, the first flange and the second flange are connected and fixed by a connecting sleeve and bolts, and can rotate in the connecting sleeve; guide grooves are provided at both ends of the adjustment frame; a group of first top blocks and second top blocks are respectively provided at both ends of the adjustment frame; the adjustment frame is pulled or pushed to move by the first electric push rod.

[0022] A pair of first wedge-shaped grooves are provided at the bottom of the first polishing part and correspond to the first top block, a first spring and a guide shaft are provided at both ends of the first polishing part, the first spring touches the first polishing part and the inner wall of the roller frame, the guide shaft is arranged in the guide grooves at both ends of the adjusting frame, a first mounting groove and a buffer groove are provided inside the first polishing part, a first limiting groove is provided at both ends of the buffer groove, a second spring is provided in the buffer groove, a mounting frame is provided in the first mounting groove, a limiting block is provided at the bottom of the mounting frame and is provided in the first limiting groove, the second spring touches the bottom of the mounting frame, and pushes the mounting frame to slide up and down along the first limiting groove in the buffer groove to achieve buffering; a second mounting groove is provided in the mounting frame, and a support block is provided on the side wall of the second mounting groove; a group of locking switches are respectively provided at both ends of the second mounting groove, the locking switch includes a rotating shaft, the rotating shaft passes through the support block, a limiting strip is provided at one end of the rotating shaft, the rotating shaft is sleeved with the third spring, and the third spring touches the support block; a felt roller is provided inside the second mounting groove, and a second limiting groove and a third limiting groove are provided at both ends of the felt roller and correspond to the locking switch.

[0023] The second polishing part is different from the first polishing part in that a group of second wedge-shaped grooves are arranged at the bottom of the second polishing part, and the wedge-shaped surfaces of the second wedge-shaped grooves are opposite to those of the first wedge-shaped grooves; the second wedge-shaped grooves correspond to the second top block.

[0024] The adjusting mechanism comprises a second electric push rod, a fixed seat, an adjusting seat, a first arm, a second arm and a motor; the fixed seat is fixed on the support frame of the conveying mechanism, the fixed seat is provided with a guide rail, the adjusting seat is slidably connected to the guide rail, the second electric push rod is fixed on the fixed seat, and the top shaft of the second electric push rod is fixedly connected to the adjusting seat; one end of the first arm is hinged to the support frame on the conveying mechanism, and the two ends of the second arm are respectively hinged to the first arm and the adjusting seat; the motor is fixed to the first arm through the motor seat, and a sprocket is provided at the motor shaft end and connected to the sprocket at the end of the sleeve through a chain; the polishing roller is driven by the motor to rotate for polishing; the height of the polishing roller is controlled by the second electric push rod to adapt to the thickness of the stainless steel plate.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) The first polishing part and the second polishing part can be used alternately. During the replacement process, the first electric push rod pulls the adjustment frame to move, and the first top block contacts the wedge surface of the first wedge groove, thereby pushing the first polishing part to rise and protrude from the roller frame in the through groove along the guide shaft. At the same time, the second top block gradually breaks away from the contact with the second wedge surface. Under the push of the first spring, the second polishing part slides along the guide shaft in the through groove to retract the roller frame. When the first electric push rod is pushed out, the first polishing part can retract the roller frame and the second polishing part can protrude from the roller frame at the same time through the cooperation of the first spring, so that the first polishing part and the second polishing part can be used alternately, and the disadvantage of serious wear of the polishing roller and the need to stop the machine for replacement during the polishing process is avoided.

[0027] At the same time, the first polishing part and the second polishing part are provided with a buffer groove and a second spring for buffering the mounting frame. Furthermore, through buffering, the polishing roller can realize self-adaptation of the plate thickness when polishing the stainless steel plate, and realize flexible polishing, which is helpful to stabilize the polishing quality and protect the stainless steel plate; the first polishing part and the second polishing part are provided with a felt roller, which is more conducive to the realization of flexible polishing; the use of the polishing mechanism not only reduces the roughness of the stainless steel surface, but also efficiently cleans the fluoride accumulated on the stainless steel surface;

[0028] 2) The present invention provides a reasonable ratio of shot blasting steel shot materials, as well as requirements for the surface roughness and rolling speed of the rolling work roll, and cooperates with the pickling process and polishing mechanism to quickly and efficiently achieve the requirement of reducing the roughness of the stainless steel surface;

[0029] 3) A locking mechanism is provided on the second polishing part of the first polishing part, which can realize the rapid replacement of the felt roller. The rotating shaft is rotated to make the limit strip fit into the third limit groove, and then the rotating shaft is lifted and rotated to make the limit strip rotate to the second limit groove, and the rotating shaft is pushed by the third spring to fix the rotating shaft and prevent it from rotating at will; when replacing the felt roller, the rotating shaft is rotated to make the limit strip fit into the third limit groove; then the felt roller is lifted;

[0030] 4) When stainless steel is polished, the stainless steel plate is transported through the conveying mechanism, and the second electric push rod in the adjustment mechanism pushes the adjustment seat to slide along the guide rail, and then the distance between the polishing roller and the stainless steel plate is controlled by the cooperation of the first arm and the second arm to adapt to the polishing of stainless steel plates of different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Attached Figure 1 It is a schematic diagram of a process structure for reducing the surface roughness of 10Cr17 stainless steel hot-rolled pickling according to the present invention;

[0032] Attached Figure 2 Yes Figure 1 Schematic diagram of the structure of the middle polishing roller;

[0033] Attached Figure 3 Yes Figure 1 Schematic diagram of the internal structure of the middle polishing roller Figure 1 ;

[0034] Attached Figure 4 Yes Figure 1 Schematic diagram of the internal structure of the middle polishing roller Figure 2 ;

[0035] Attached Figure 5 Yes Figure 4 A magnified schematic diagram of the local structure;

[0036] Attached Figure 6 Yes Figure 2 Structural diagram of the middle roller frame;

[0037] Attached Figure 7 Yes Figure 4 The structural diagram of the middle adjustment frame;

[0038] Attached Figure 8 Yes Figure 3 A schematic diagram of the structure of the second polishing part;

[0039] Attached Fig. 9 Yes Figure 3 A schematic structural diagram of the first polishing part;

[0040] Attached Fig.10 Yes Fig. 9 Schematic diagram of the internal structure of the first polishing part Figure 1 ;

[0041] Attached Fig.11 Yes Fig. 9 Schematic diagram of the internal structure of the first polishing part Figure 2 ;

[0042] Attached Fig.12 Yes Fig. 9 Schematic diagram of the internal structure of the first polishing part Figure 3 ;

[0043] Attached Fig.13 Yes Fig.11 Schematic diagram of the structure of the middle felt roller;

[0044] In the figure: 1, polishing roller; 13, roller frame; 131, sleeve; 1311, fixed flange; 132, through groove; 14, adjustment frame; 141, first top block; 142, second top block; 143, guide groove; 144, fixed shaft; 1441, first flange; 145, sleeve; 146, first electric push rod; 1461, second flange; 147, connecting sleeve; 15, first polishing part; 151, first wedge groove; 152, first spring; 153, guide shaft; 154, first mounting groove; 155, buffer groove; 1551, first limit groove; 1552, second Spring; 156, mounting frame; 1561, limit block; 1562, support block; 1563, second mounting slot; 157, locking switch; 1571, rotating shaft; 1572, limit strip; 1573, third spring; 158, felt roller; 1581, second limit slot; 1582, third limit slot; 16, second polishing portion; 161, second wedge-shaped slot; 2, adjustment mechanism; 21, second electric push rod; 22, fixed seat; 221, guide rail; 23, adjustment seat; 24, first arm; 25, second arm; 26, motor; 3, conveying mechanism; 4, stainless steel plate. DETAILED DESCRIPTION

[0045] To facilitate the understanding of those skilled in the art, Figure 1-13 , the technical solution of the present invention is further specifically described.

[0046] Embodiment 1:

[0047] A process for reducing the surface roughness of 10Cr17 stainless steel hot-rolled pickling, the process steps are as follows:

[0048] 1) Prepare the billet for heating in the heating furnace;

[0049] 2) High-pressure water descaling: the oxide scale on the surface of the heated steel billet is removed by a high-pressure water jet mechanism.

[0050] 3) Rolling: Rough rolling and finishing rolling: The heated billet is transferred to the rough rolling mill through the transfer roller, and the transfer device is provided with a corresponding heat preservation cover; during finishing rolling, the billet is rolled in 7 passes; the first pass has a reduction rate of 31%; the second pass has a reduction rate of 30.5%; the third pass has a reduction rate of 25.5%; the fourth pass has a reduction rate of 25%; the fifth pass has a reduction rate of 26%; the sixth pass has a reduction rate of 20.5%; the seventh pass has a reduction rate of 21%;

[0051] The 1st and 2nd passes use working rolls with a roughness of 3.50 μm and a rolling speed of 75 mpm; the 3rd to 5th passes use working rolls with a roughness of 1.6 μm and a rolling speed of 175 mpm; the 6th and 7th passes use working rolls with a roughness of 1.8 μm and a rolling speed of 310 mpm.

[0052] 4) Coiling: After finishing rolling, the steel is sent to the coiling mechanism for coiling.

[0053] 5) Uncoiling and welding: The two adjacent sets of stainless steel plates are welded and fixed by welding mechanism to facilitate the overall pickling of the stainless steel plates.

[0054] 6) Annealing: The stainless steel plate is annealed by an annealing mechanism and then cooled.

[0055] 7) Phosphorus-breaking shot blasting: Shot blast the annealed stainless steel plate through a shot blasting machine; the shot blasting medium is high carbon cast steel shot;

[0056] Optimizing the particle size of the steel shot, in the method of reducing the surface roughness of the hot plate after shot blasting of the present invention, the particle size distribution of the steel shot is:

[0057] granularity >0.4mm 0.3-0.4mm <0.3mm steel shot 1.6% 88% 11.4%

[0058] 8) Pickling: The stainless steel plate is pickled by the pickling mechanism to remove the oxide scale; the pickling process has a mixed acid stage and a mixed acid stage; the mixed acid stage has an HNO3 concentration of 55g / L, an HF concentration of 36.5g / L, a metal ion concentration of 26.5g / L, and a temperature of 62°C; the mixed acid stage has an HNO3 concentration of 50g / L, an HF concentration of 32.5g / L, a metal ion concentration of 26 / L, and a temperature of 48°C.

[0059] 9) Cleaning and drying: The pickled stainless steel plate is cleaned by the cleaning mechanism, and then dried by the drying system before curling. The cleaning mechanism is equipped with a polishing mechanism, which cooperates with the cleaning liquid to polish the surface of the stainless steel plate to reduce the roughness.

[0060] The polishing mechanism includes a polishing roller 1, an adjusting mechanism 2, and a conveying mechanism 3; the adjusting mechanism 2 is arranged on a supporting frame of the conveying mechanism 3, a pair of polishing rollers 1 are arranged on the upper and lower sides of a stainless steel plate 4, the conveying mechanism 3 is located at the position of the polishing roller 1 and is transparent from top to bottom, and no conveying roller shaft is installed, the adjusting mechanism 2 is connected to control the polishing roller 1, and the distance between the polishing roller 1 and the stainless steel plate 4 is controlled by the adjusting mechanism 2 to perform polishing and grind the roughness.

[0061] The polishing roller 1 comprises a roller frame 13, at both ends of which are provided with a sleeve 131 fixedly connected, at the end of which are provided with a fixing flange 1311 and a sprocket, and on which are provided a plurality of through grooves 132; inside the roller frame 13 is provided an adjustment frame 14 and a plurality of first polishing parts 15 and second polishing parts 16 distributed at intervals, wherein the first polishing parts 15 and the second polishing parts 16 are arranged in the through grooves 132; at both ends of the adjustment frame 14 are provided with a fixed shaft 144 and rotatably connected to the two ends of the roller frame 13 through a shaft sleeve 145, the fixed shaft 144 is sleeved with the shaft sleeve 145, and the fixed shaft 144 is fixed to the shaft sleeve 145. A first flange 1441 is provided at one end of the fixed shaft 144, a first electric push rod 146 is provided on the fixed flange 1311, a second flange 1461 is provided at the top shaft end of the first electric push rod 146, the first flange 1441 and the second flange 1461 are connected and fixed by a connecting sleeve 147 with bolts, and can rotate in the connecting sleeve 147; guide grooves 143 are provided at both ends of the adjusting frame 14; a group of first top blocks 141 and second top blocks 142 are respectively provided at both ends of the adjusting frame 14; the adjusting frame 14 is pulled or pushed to move by the first electric push rod 146.

[0062] A pair of first wedge-shaped grooves 151 are provided at the bottom of the first polishing part 15 and correspond to the first top block 141. First springs 152 and guide shafts 153 are provided at both ends of the first polishing part 15. The first spring 152 contacts the first polishing part 15 and the inner wall of the roller frame 13. The guide shaft 153 is arranged in the guide grooves 143 at both ends of the adjustment frame 14. A first mounting groove 154 and a buffer groove 155 are provided inside the first polishing part 15. First limiting grooves 1551 are provided at both ends of the buffer groove 155. A second spring 1552 is provided in the buffer groove 155. A mounting frame 156 is provided in the first mounting groove 154. A limiting block 1561 is provided at the bottom of the mounting frame 156 and is arranged in the first limiting groove 1551. The second spring 1552 contacts the bottom of the mounting frame 156 to push The mounting frame 156 slides up and down along the first limiting groove 1551 in the buffer groove 155 to achieve buffering; a second mounting groove 1563 is provided in the mounting frame 156, and a support block 1562 is provided on the side wall of the second mounting groove 1563; a group of locking switches 157 are respectively provided at both ends of the second mounting groove 1563, and the locking switch 157 includes a rotating shaft 1571, the rotating shaft 1571 passes through the support block 1562, and a limiting strip 1572 is provided at one end of the rotating shaft 1571, the rotating shaft 1571 is sleeved with a third spring 1573, and the third spring 1573 touches the support block 1562; a felt roller 158 is provided inside the second mounting groove 1563, and a second limiting groove 1581 and a third limiting groove 1582 are provided at both ends of the felt roller 158 and correspond to the locking switch 157.

[0063] The second polishing portion 16 is different from the first polishing portion 15 in that a group of second wedge-shaped grooves 161 are provided at the bottom of the second polishing portion 16 , and the wedge-shaped surfaces of the second wedge-shaped grooves 161 are opposite to those of the first wedge-shaped grooves 151 ; the second wedge-shaped grooves 161 correspond to the second top block 142 .

[0064] The adjusting mechanism 2 comprises a second electric push rod 21, a fixed seat 22, an adjusting seat 23, a first arm 24, a second arm 25 and a motor 26; the fixed seat 22 is fixed on the support frame of the conveying mechanism 3, a guide rail 221 is provided on the fixed seat 22, the adjusting seat 23 is slidably connected to the guide rail 221, the second electric push rod 21 is fixed on the fixed seat 22, and the top shaft of the second electric push rod 21 is fixedly connected to the adjusting seat 23; one end of the first arm 24 is hingedly connected to the support frame on the conveying mechanism 3, and the two ends of the second arm 25 are respectively hingedly connected to the first arm 24 and the adjusting seat 23; the motor 26 is fixed to the first arm 24 through the motor seat, a sprocket is provided at the shaft end of the motor 26 and the sprocket at the end of the sleeve 131 is connected through a chain; the polishing roller 1 is driven to rotate by the motor 26 for polishing; the height of the polishing roller 1 is pushed and controlled by the second electric push rod 21 to adapt to the thickness of the stainless steel plate 4.

[0065] When the stainless steel plate 4 is polished, the stainless steel plate 4 is conveyed by the conveying mechanism 3, and the second electric push rod 21 in the adjusting mechanism 2 pushes the adjusting seat 23 to slide along the guide rail 221, and then the distance between the polishing roller 1 and the stainless steel plate 4 is controlled by the first support arm 24 and the second support arm 25 to adapt to the polishing of stainless steel plates 4 of different thicknesses.

[0066] The polishing roller 1 is driven to rotate by the motor 26 to realize the polishing treatment of the stainless steel plate 4 by the first polishing part 15 and the second polishing part 16; wherein the first polishing part 15 and the second polishing part 16 are used alternately with each other. When the first polishing part 15 or the second polishing part 16 is seriously worn, the first electric push rod 146 is used to realize the rapid alternation of the two to maintain continuous polishing.

[0067] During the replacement alternating process, the first electric push rod 146 pulls the adjustment frame 14 to move, and the first top block 141 contacts the wedge-shaped surface of the first wedge-shaped groove 151, thereby pushing the first polishing part 15 along the guide shaft 153 to rise and protrude the roller frame 13 in the through groove 132, and at the same time, the second top block 142 gradually breaks away from the contact with the second wedge-shaped surface, and the second polishing part 16 slides along the guide shaft 153 in the through groove 132 and retracts the roller frame 13 under the push of the first spring 152; when the first electric push rod 146 is pushed out, the first polishing part 15 retracts the roller frame, and the second polishing part 16 protrudes from the roller frame 13 through the cooperation of the first spring 152, thereby realizing the alternating use of the first polishing part 15 and the second polishing part 16, and avoiding the disadvantage of severe wear of the polishing roller 1 and the need to stop the machine for replacement during the polishing process.

[0068] At the same time, a buffer groove 155 and a second spring 1552 are provided on the first polishing part 15 and the second polishing part 16 for buffering the mounting frame 156. Furthermore, through buffering, the polishing roller 1 can achieve self-adaptation of the plate thickness when polishing the stainless steel plate 4, and realize flexible polishing, which helps to stabilize the polishing quality and protect the stainless steel plate 4.

[0069] Furthermore, the locking switch 157 can be used to quickly replace the felt roller 158. The rotating shaft 1571 is rotated to make the limit strip 1572 fit into the third limit groove 1582. The rotating shaft 1571 is then lifted and rotated to make the limit strip 1572 rotate to the second limit groove 1581. The rotating shaft 1571 is pushed by the third spring 1573 to fix the rotating shaft 1571 and prevent it from rotating at will. When replacing the felt roller 158, the rotating shaft 1571 is rotated to make the limit strip 1572 fit into the third limit groove 1582. Then the felt roller 158 is lifted.

[0070] Embodiment 2:

[0071] The following steps are different from Example 1:

[0072] 3) Rolling: Rough rolling and finishing rolling: The heated billet is transferred to the rough rolling mill through the transfer roller, and the transfer device is provided with a corresponding heat preservation cover; the billet is rolled in 7 passes during rough rolling; the first pass has a reduction rate of 30.5%; the second pass has a reduction rate of 31%; the third pass has a reduction rate of 25%; the fourth pass has a reduction rate of 24%; the fifth pass has a reduction rate of 24.5%; the sixth pass has a reduction rate of 21%; the seventh pass has a reduction rate of 21.5%;

[0073] The 1st and 2nd passes use working rolls with a roughness of 3.85μm and a rolling speed of 65mpm; the 3rd to 5th passes use working rolls with a roughness of 1.55μm and a rolling speed of 175mpm each time, and the 6th to 7th passes use working rolls with a roughness of 1.75μm and a rolling speed of 290mpm each time.

[0074] 7) Phosphorus breaking shot blasting;

[0075] Optimizing the particle size of the steel shot, in the method of reducing the surface roughness of the hot plate after shot blasting of the present invention, the particle size distribution of the steel shot is:

[0076] granularity >0.4mm 0.3-0.4mm <0.3mm steel shot 1.75% 86% 12.25%

[0077] 8) Pickling: The stainless steel plate is pickled by the pickling mechanism to remove the oxide scale; the pickling process has a mixed acid stage and a mixed acid stage; the mixed acid stage has an HNO3 concentration of 60g / L, an HF concentration of 37g / L, a metal ion concentration of 25g / L, and a temperature of 55°C; the mixed acid stage has an HNO3 concentration of 45g / L, an HF concentration of 33g / L, a metal ion concentration of 28 / L, and a temperature of 47.5°C.

[0078] Embodiment 3:

[0079] The difference compared with Example 1 is that no polishing mechanism is used in the cleaning and drying process in step 9).

[0080] Comparative Example 1: A rolled steel plate of the same specification as that of Example 1-2 was used, and the process of the method for reducing the surface roughness of a hot plate after shot blasting treatment in Patent Application Publication No. CN109333369 A was used to reduce the surface roughness.

[0081] Comparative Example 2: A rolled steel plate of the same specification as in Example 1-2 was used, and the process of a production method for improving the surface quality of stainless steel in patent application publication number CN107891064 A was adopted to reduce the surface roughness.

[0082] The surface roughness test results of Examples 1-3 and Comparative Examples 1-2 are shown in the following table:

[0083] Measuring point 1μm Measuring point 2μm Measuring point 3μm Average value μm Example 1 2.96 2.92 2.945 2.94 Example 2 2.98 3.01 2.955 2.98 Example 3 3.22 3.26 3.21 3.23 Comparative Example 1 3.11 3.09 3.068 3.089 Comparative Example 2 3.65 3.58 3.485 3.57

[0084] Based on the above appearance quality inspection results, the following conclusions are drawn:

[0085] Surface roughness test results of Example 1-2: The roughness values ​​and average values ​​of measuring points 1-3 are stable and all below 3 μm.

[0086] Surface roughness test results of Example 3: The roughness values ​​and average values ​​of measuring points 1-3 are stable and all above 3 μm, and all exceed 3.2 μm, which is quite different from the roughness values ​​of Example 1-2.

[0087] The surface roughness test results of Comparative Example 1: The roughness values ​​and average values ​​of measuring points 1-3 are stable, but exceed 3 μm, which is significantly different from the roughness values ​​of Examples 1-2 which are all below 3 μm.

[0088] Surface roughness test results of Comparative Example 2: The roughness values ​​and average values ​​of measuring points 1-3 are stable and all above 3 μm, and the average value exceeds 3.5 μm, which is the largest difference from the roughness value of Example 1-2.

[0089] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A process for reducing the surface roughness of 10Cr17 stainless steel hot-rolled pickling. Features The process steps are as follows: 1) Prepare the billet for heating in the heating furnace; 2) High-pressure water descaling: the oxide scale on the surface of the heated billet is removed by a high-pressure water jet mechanism; 3) Rolling: Rough rolling and finish rolling. The heated billet is transferred to the rough rolling mill through the transfer rollers. The transfer device is equipped with a corresponding heat preservation cover. 4) Coiling: After finishing rolling, it is sent to the coiling mechanism for coiling; 5) Uncoiling and welding: The two adjacent sets of stainless steel plates are welded and fixed by the welding mechanism to facilitate the overall pickling of the stainless steel plates; 6) Annealing: The stainless steel plate is annealed by an annealing mechanism and then cooled; 7) Phosphorus-breaking shot blasting: Shot blast the annealed stainless steel plate through a shot blasting machine; the shot blasting medium is high carbon cast steel shot; 8) Pickling: The stainless steel plate is pickled to remove the oxide scale through the pickling mechanism; the pickling process has mixed acid stage one and mixed acid stage two; 9) Cleaning and drying: The stainless steel plate after pickling is cleaned by the cleaning mechanism, and then dried by the drying system before curling. The cleaning mechanism is equipped with a polishing mechanism, which cooperates with the cleaning liquid to polish the surface of the stainless steel plate to reduce the roughness; The polishing mechanism includes a polishing roller, an adjustment mechanism, and a conveying mechanism; the adjustment mechanism is arranged on a support frame of the conveying mechanism, a pair of polishing rollers are arranged on the upper and lower sides of the stainless steel plate, the conveying mechanism is located at the position of the polishing roller and is transparent from top to bottom, and no conveying roller shaft is installed, the adjustment mechanism is connected to control the polishing roller, and the distance between the polishing roller and the stainless steel plate is controlled by the adjustment mechanism to perform polishing and grind the roughness; The polishing roller comprises a roller frame, wherein two ends of the roller frame are provided with a fixedly connected sleeve, the end of the sleeve is provided with a fixed flange and a sprocket, and the roller frame is provided with a plurality of through grooves; an adjusting frame and a plurality of first polishing parts and second polishing parts distributed at intervals are provided inside the roller frame, and the first polishing part and the second polishing part are provided in the through grooves; two ends of the adjusting frame are provided with fixed shafts and the two ends of the roller frame are rotatably connected through a shaft sleeve, the fixed shaft sleeve is connected to the shaft sleeve, one end of the fixed shaft is provided with a first flange, the fixed flange is provided with a first electric push rod, the end of the top shaft of the first electric push rod is provided with a second flange, the first flange and the second flange are connected and fixed by a connecting sleeve and bolts, and can rotate in the connecting sleeve; two ends of the adjusting frame are provided with guide grooves; two ends of the adjusting frame are provided with a group of first top blocks and a second top block respectively; A pair of first wedge-shaped grooves are provided at the bottom of the first polishing part and correspond to the first top block, a first spring and a guide shaft are provided at both ends of the first polishing part, the first spring touches the first polishing part and the inner wall of the roller frame, the guide shaft is arranged in the guide grooves at both ends of the adjusting frame, a first mounting groove and a buffer groove are provided inside the first polishing part, a first limiting groove is provided at both ends of the buffer groove, a second spring is provided in the buffer groove, a mounting frame is provided in the first mounting groove, a limiting block is provided at the bottom of the mounting frame and is arranged in the first limiting groove, the second spring touches the bottom of the mounting frame, and pushes the mounting frame to slide up and down along the first limiting groove in the buffer groove to achieve buffering; a second mounting groove is provided in the mounting frame, and a support block is provided on the side wall of the second mounting groove; a group of locking switches are respectively provided at both ends of the second mounting groove, the locking switch includes a rotating shaft, the rotating shaft passes through the support block, a limiting strip is provided at one end of the rotating shaft, the rotating shaft is sleeved with the third spring, and the third spring touches the support block; a felt roller is provided inside the second mounting groove, and a second limiting groove and a third limiting groove are provided at both ends of the felt roller and correspond to the locking switch; The second polishing part is different from the first polishing part in that a group of second wedge-shaped grooves are arranged at the bottom of the second polishing part, and the wedge-shaped surfaces of the second wedge-shaped grooves are opposite to those of the first wedge-shaped grooves; the second wedge-shaped grooves correspond to the second top block.

2. A process for reducing the surface roughness of 10Cr17 stainless steel hot-rolled pickling according to claim 1, Features Step 3) During the intermediate finishing rolling, the steel billet is rolled in 7 passes; the first pass has a reduction rate of 30-32%; the second pass has a reduction rate of 30-32%; the third pass has a reduction rate of 24-26%; the fourth pass has a reduction rate of 24-26%; the fifth pass has a reduction rate of 24-26%; the sixth pass has a reduction rate of 20-22%; the seventh pass has a reduction rate of 20-22%; For 1-2 passes, working rolls with a roughness of 3.5-4.0μm are used at a rolling speed of 60-80mpm; for 3-5 passes, working rolls with a roughness of 1.2-1.8μm are used each time, and the rolling speed is 160-180mpm; for 6-7 passes, working rolls with a roughness of 1.6-1.8μm are used each time, and the rolling speed is 250-400mpm.

3. A process for reducing the surface roughness of 10Cr17 stainless steel hot-rolled pickling according to claim 1, Features Step 7) The total amount of steel shots with a particle size of ≥0.4 mm among the medium and high carbon cast steel shots is less than 1.8%, and the total amount of steel shots with a particle size of 0.3 mm-0.4 mm reaches 85-90%.

4. A process for reducing the surface roughness of 10Cr17 stainless steel hot-rolled pickling according to claim 1, Features Step 9) Mixed acid HNO 3 Concentration is 55-65g / L, HF concentration is 35-40g / L, metal ions are less than 28g / L, temperature is 55-65℃; mixed acid second stage HNO 3 The concentration is 40-50g / L, HF concentration is 30-35 g / L, metal ion concentration is 25-30g / L, and the temperature is 45-50℃.

5. A process for reducing the surface roughness of 10Cr17 stainless steel hot-rolled pickling according to claim 1, Features The adjusting mechanism comprises a second electric push rod, a fixed seat, an adjusting seat, a first support arm, a second support arm and a motor; the fixed seat is fixed on a support frame of the conveying mechanism, a guide rail is provided on the fixed seat, the adjusting seat is slidably connected to the guide rail, the second electric push rod is fixed on the fixed seat, and the top shaft of the second electric push rod is fixedly connected to the adjusting seat; one end of the first support arm is hingedly connected to the support frame on the conveying mechanism, and both ends of the second support arm are respectively hingedly connected to the first support arm and the adjusting seat; the motor is fixed to the first support arm through a motor seat, a sprocket is provided at the motor shaft end and is connected to the sprocket at the end of the sleeve through a chain.

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