Wide high-carbon stainless steel sheet and manufacturing method thereof

Abstract

The invention discloses a wide high-carbon stainless steel sheet and a manufacturing method thereof. The method comprises the following steps: S1, blank preparation: cutting and pretreating a flat steel blank; s2, hot rolling and annealing are conducted, specifically, the pretreated flat steel blank is heated to a preset temperature and rolled, then an obtained semi-finished product plate blank is returned to a furnace to be heated and rolled again, and then annealing is conducted; s3, cold rolling and annealing are conducted, specifically, cold rolling is conducted in two rolling processes, and intermediate annealing is conducted after cold rolling in the first rolling process; finished product annealing is conducted after second rolling process cold rolling; the pass deformation of the first rolling process is greater than or equal to that of the second rolling process; and S4, leveling treatment is conducted, specifically, the high-carbon stainless steel thin plate obtained after cold rolling and annealing is subjected to leveling treatment and edge shearing. According to the method, the deformation temperature, the deformation pass, the deformation amount and the annealing temperature are reasonably matched, the rolling pass is effectively reduced, no edge crack exists in the rolling process, the beneficial effects are achieved, and the rolling level of a high-carbon martensite series steel single plate can be improved after the method is applied.

Description

Technical Field

[0001] The present invention relates to the technical field of iron and steel metallurgy, and particularly to a wide-width high-carbon stainless steel thin plate and a manufacturing method thereof. Background Art

[0002] High-carbon high-chromium martensitic stainless steels have characteristics such as high hardness, high wear resistance, and corrosion resistance. Due to their poor plasticity, these steel grades are difficult to hot-work and cold-work, have a large deformation resistance during rolling, require many rolling passes, and are prone to edge cracking.

[0003] For example, Chinese Patent with Application No. CN202311019603.1 discloses a hot-rolling preparation method for a single sheet of TC4 titanium alloy, which includes the following steps: S1. Blank preparation: The forging blank is a TC4 titanium alloy with a thickness of 80 mm to 120 mm. The specific length and width of the blank are determined according to the width of the mill roller table and the bite ability of the rolls; ensure that the blank thickness is uniform, and there are no micro-cracks, oil stains, scale, or foreign object pressing defects on the surface; S2. Heating: The blank is quickly heated to temperature in an electric heating furnace or a walking beam heating furnace; the heating temperature is 950 - 970 °C, and the heating time is 1.2 - 1.5 min / mm; S3. Hot rolling: It is divided into three rolling heats in total. The blank is rolled at temperature for each heat. After being discharged from the furnace, it is quickly transferred to the front of the mill for rolling; no descaling is performed, the cooling water flow rate of the rolls is reduced, the starting rolling temperature is not lower than 880 °C, the finishing rolling temperature is not lower than 680 °C, and online hot straightening is performed after each heat of rolling. The thickness difference of the same plate is measured, and then it is air-cooled; S4. Intermediate blank treatment; S5. Annealing treatment.

[0004] This method is for the preparation of a single sheet of titanium alloy, and its material properties and process parameters are not applicable to the preparation of a wide-width high-carbon stainless steel thin plate.

[0005] For example, a method for manufacturing a hot-rolled coil of high-carbon martensitic stainless steel is disclosed in a Chinese patent with the application number CN202410473034.6. It includes heating the slab, where the furnace temperatures in the first and second heating stages are 1280 - 1300 °C, the furnace temperature in the soaking stage is 1220 - 1250 °C, the total heating time is 180 - 230 min, and the soaking time in the soaking stage is ≥50 min; using ultra-high-pressure water descaling with a water pressure of 30 - 40 MPa; before the slab enters the roughing mill after descaling, the temperature at the center of the slab end face is 1100 - 1160 °C, the roughing is carried out in 5 passes with reduction ratios of 12 - 18%, 18 - 26%, 30 - 38%, 30 - 38%, 35 - 40% respectively, and the final rolling temperature is ≥1100 °C; the finishing rolling is carried out in 7 passes with reduction ratios of 36 - 40%, 31 - 36%, 28 - 32%, 24 - 28%, 19 - 24%, 15 - 20%, 12 - 16% respectively, and the reduction ratios decrease successively from the first pass to the seventh pass. This patent effectively solves the problems of center delamination and edge cracking of the slab during the hot continuous rolling of high-carbon martensitic stainless steel, and at the same time greatly improves the production efficiency.

[0006] For example, a cold rolling method for high-carbon martensitic stainless steel is disclosed in a Chinese patent with the application number CN202310998453.7. It includes controlling the total deformation rate of cold rolling within 60 - 75%; controlling the deformation rate in the first pass within 8%, the deformation rate in the last three passes within 10%, and the deformation rate in the remaining passes within 15% according to the total deformation rate, and the deformation rate gradually decreases from the second pass to the penultimate fourth pass. This patent can effectively eliminate the problem of strip breakage during the cold rolling of high-carbon martensitic stainless steel.

[0007] The inventors of the present application have realized that there is still room for further improvement in the prior art. Summary of the Invention

[0008] The main object of the present invention is to provide a wide-width high-carbon stainless steel thin plate and its manufacturing method, which reasonably match the deformation temperature, deformation passes, deformation amount, and annealing temperature, effectively reduce the number of rolling passes, have no edge cracking during the rolling process, and achieve beneficial effects. After application, it can improve the rolling level of single sheets of high-carbon martensitic series steel grades.

[0009] According to one aspect of the present invention, a method for manufacturing a wide-width high-carbon stainless steel thin plate is provided, which includes the following steps: S1. Blank preparation: Divide and preprocess the flat steel blank. S2. Hot rolling and annealing: Heat the preprocessed flat steel blank to a predetermined temperature and carry out rolling, then heat the obtained semi-finished slab back to the furnace and carry out rolling again, and then carry out annealing. S3. Cold rolling and annealing: Cold rolling is carried out in two rolling passes. Intermediate annealing is carried out after the first rolling pass; finish annealing is carried out after the second rolling pass; the pass reduction of the first rolling pass ≥ the pass reduction of the second rolling pass. S4. Levelling treatment: The cold-rolled and annealed high-carbon stainless steel sheet is subjected to levelling treatment and trimming.

[0010] According to an embodiment of the present invention, in step S2, heating the pretreated flat steel blank to a predetermined temperature and rolling includes: heating to 1150 - 1200 °C and holding for 2 - 4 hours, controlling the pass reduction at 2 - 3 mm per pass, and rolling to a thickness of 5 - 6 mm.

[0011] According to an embodiment of the present invention, in step S2, reheating the obtained semi-finished slab and rolling again includes: reheating the semi-finished slab and holding for 20 - 30 minutes, controlling the pass reduction at 0.5 - 1.0 mm per pass, and rolling to a thickness of 2 - 3 mm.

[0012] According to an embodiment of the present invention, the first rolling pass cold rolling in step S3 specifically includes: controlling the pass reduction at 0.2 - 0.3 mm, the rolling speed at 0.3 - 0.4 m / s, and controlling the total reduction of the rolling pass at 30 - 50%.

[0013] According to an embodiment of the present invention, the second rolling pass cold rolling in step S3 specifically includes: controlling the pass reduction at 0.1 - 0.2 mm, the rolling speed at 0.3 - 0.4 m / s, and rolling to a thickness of 0.3 - 0.5 mm.

[0014] According to an embodiment of the present invention, annealing in step S2, intermediate annealing in step S3, and / or finish annealing in step S3 includes: heating temperature 770 - 790 °C, holding for 4 - 6 hours, and cooling in the furnace to below 500 °C before discharging.

[0015] According to an embodiment of the present invention, after annealing in step S2, after intermediate annealing in step S3, and / or after finish annealing in step S3, air cooling, pickling treatment, and skin pass grinding are carried out.

[0016] According to an embodiment of the present invention, the thickness of the pretreated blank is 18 - 20 mm, the width is 200 - 300 mm, and the length is 500 - 700 mm; the length of the wide-width high-carbon stainless steel sheet is 1500 - 2000 mm, the width is 800 - 1000 mm, the thickness is 0.4 - 0.5 mm; the carbon content of the wide-width high-carbon stainless steel sheet is greater than 0.5%.

[0017] According to an embodiment of the present invention, the pretreatment includes grinding and / or milling treatment.

[0018] According to another aspect of the present invention, a wide-width high-carbon stainless steel thin plate is provided, which is manufactured by the method of any one of the above technical solutions, and the flatness of the wide-width high-carbon stainless steel thin plate is ≤ 0.05 mm / m.

[0019] In a wide-width high-carbon stainless steel thin plate and its manufacturing method according to an embodiment of the present invention, the deformation temperature, the number of deformation passes, the deformation amount, and the annealing temperature are reasonably matched, effectively reducing the number of rolling passes, without edge cracking during the rolling process, achieving beneficial effects, and after application, the rolling level of single sheets of high-carbon martensite series steel grades can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 The process flow diagram of a manufacturing method of a wide-width high-carbon stainless steel thin plate according to an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following detailed description of the embodiments is used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention. The present invention can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but including all technical solutions falling within the scope of the claims.

[0023] These embodiments of the present invention are provided to make the present disclosure thorough and complete, and to fully convey the scope of the present invention to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions and values described in these embodiments should be construed as merely exemplary, rather than as limitations.

[0024] It should be noted that in the description of the present invention, unless otherwise specified, "a plurality of" means greater than or equal to two; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0025] It should also be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. When it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0026] All terms used in the present invention have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as, should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such herein.

[0027] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, these technologies, methods, and devices should be regarded as part of the specification.

[0028] As Figure 1 shown, the present invention provides a method for manufacturing a wide-width high-carbon stainless steel thin plate, which includes the following steps: S1. Blank preparation: Divide and preprocess a flat steel blank. S2. Hot rolling and annealing: Heat the preprocessed flat steel blank to a predetermined temperature and perform rolling, then heat the obtained semi-finished slab in a furnace and perform rolling again, and then perform annealing. S3. Cold rolling and annealing: Cold rolling is carried out in two rolling passes. Intermediate annealing is carried out after the first rolling pass; final annealing is carried out after the second rolling pass; the pass reduction of the first rolling pass ≥ the pass reduction of the second rolling pass. S4. Levelling treatment: Perform levelling treatment and trimming on the high-carbon stainless steel thin plate after cold rolling and annealing.

[0029] In the method for manufacturing a wide-width high-carbon stainless steel thin plate according to an embodiment of the present invention, the deformation temperature, deformation passes, reduction, and annealing temperature are reasonably matched, effectively reducing the number of rolling passes, and there is no edge crack during the rolling process, achieving beneficial effects. After application, the rolling level of single sheets of high-carbon martensitic series steel grades can be improved.

[0030] In an embodiment of the present invention, the carbon content of the wide-width high-carbon stainless steel thin sheet is greater than 0.5%, for example, it can be greater than 0.6%, greater than 0.7%, greater than 0.8%, greater than 0.9%. The length of the wide-width high-carbon stainless steel thin sheet is 1500 - 2000 mm, the width is 800 - 1000 mm, and the thickness is 0.4 - 0.5 mm. For example, it can be a length of 2000 mm, a width of 1000 mm, and a thickness of 0.5 mm.

[0031] Specifically, the blank used in this application is a 95Cr18 high-carbon stainless steel flat steel blank. After the steel blank is segmented, the surface is polished or milled. The thickness of the processed blank is 18 mm - 20 mm, the width is 300 mm, and the length is 700 mm.

[0032] In some specific embodiments, in step S2, heating the pretreated flat steel blank to a predetermined temperature and performing rolling includes: heating to 1150 - 1200 °C and holding for 2 - 4 hours, controlling the deformation per pass according to 2 - 3 mm, and rolling to a thickness of 5 - 6 mm. The roller hearth furnace production line has a high degree of controllable automation. Usually, microcomputer program operation and automatic control of the controlled atmosphere are realized, making the production process more stable and reliable, reducing manual intervention and errors, and improving production efficiency.

[0033] Based on the above embodiments, in step S2, reheating the obtained semi-finished slab and performing rolling again includes: reheating the semi-finished slab in the furnace and holding for 20 - 30 minutes, controlling the pass deformation amount according to 0.5 - 1.0 mm, and rolling to a thickness of 2 - 3 mm.

[0034] When the rolling thickness reaches 5 - 6 mm, to avoid edge cracking due to the rapid temperature drop of the thin sheet, the semi-finished slab is reheated in the furnace and held for 20 - 30 minutes. If the final rolling temperature ≤ 950 °C, reheating can be carried out in advance. The reheated semi-finished slab is rolled again, and the pass deformation amount is controlled according to 0.5 - 1.0 mm. The hot rolling specification is 3 mm.

[0035] After hot rolling, the hot-rolled slab is annealed in an annealing furnace, with a heating temperature of 770 °C - 790 °C, holding for 4 - 6 hours, cooling in the furnace to below 500 °C and then air-cooling out of the furnace. Then, pickling treatment and point grinding are carried out to remove the surface scale and local defects of the hot-rolled blank, avoiding the expansion of defects during the processing.

[0036] In some specific embodiments, the first-pass cold rolling in step S3 specifically includes: controlling the pass deformation amount to be 0.2 - 0.3 mm, the rolling speed to be 0.3 - 0.4 m / s, and the total deformation amount of the rolling pass to be 30 - 50%, for example, it can be 50%; then intermediate annealing is carried out, the heating temperature is 770 - 790 °C, the heat preservation time is 4 - 6 hours, it is cooled in the furnace to below 500 °C and then taken out of the furnace for air cooling, and then pickling treatment and point grinding are carried out to remove the surface oxide scale and local defects of the hot-rolled billet, so as to avoid the expansion of defects during the processing.

[0037] In some specific embodiments, the second-pass cold rolling in step S3 specifically includes: controlling the pass deformation amount to be 0.1 - 0.2 mm, the rolling speed to be 0.3 - 0.4 m / s, rolling to a thickness of 0.3 - 0.5 mm, for example, it can be rolled to the target specification of 0.5 mm; then finish annealing is carried out, the heating temperature is 770 - 790 °C, the heat preservation time is 4 - 6 hours, it is cooled in the furnace to below 500 °C and then taken out of the furnace, and then pickling treatment and point grinding are carried out to remove the surface oxide scale and local defects of the hot-rolled billet.

[0038] Based on the above embodiments, the annealing in step S2, the intermediate annealing in step S3 and / or the finish annealing in step S3 include: the heating temperature is 770 - 790 °C, the heat preservation time is 4 - 6 hours, and it is cooled in the furnace to below 500 °C and then taken out of the furnace.

[0039] In some specific embodiments, after the annealing in step S2, after the intermediate annealing in step S3 and / or after the finish annealing in step S3, air cooling, pickling treatment and point grinding are carried out.

[0040] Based on the above embodiments, the thickness of the pre-treated billet is 18 - 20 mm, the width is 200 - 300 mm, and the length is 500 - 700 mm. For example, the width can be 300 mm and the length can be 700 mm; the length of the wide-width high-carbon stainless steel thin plate is 1500 - 2000 mm, the width is 800 - 1000 mm, and the thickness is 0.4 - 0.5 mm. For example, the length can be 2000 mm, the width can be 1000 mm, and the thickness can be 0.5 mm; the carbon content of the wide-width high-carbon stainless steel thin plate is greater than 0.5%.

[0041] Based on the above embodiments, the size of the high-carbon stainless steel thin plate after leveling treatment in step S4 is 0.5 mm × 1000 mm × 2000 mm. The cold-rolled and pickled high-carbon stainless steel thin plate is subjected to leveling treatment and trimming to obtain a single wide-width high-carbon stainless steel thin plate of 0.5 mm × 1000 mm × 2000 mm. The leveling treatment can effectively eliminate defects such as unevenness and waviness generated during the cold rolling process, make the surface of the stainless steel thin plate smoother, and thus improve the overall quality and appearance effect of the product.

[0042] In some specific embodiments, the thickness of the pre-treated blank is 18 - 20 mm, the width is 300 mm, and the length is 700 mm.

[0043] Based on the above embodiments, the pre-treatment includes grinding and / or milling. Grinding and milling can remove impurities such as rust, scale, and oil on the surface of the flat steel blank, as well as defects such as burrs and scratches generated during the processing, making the surface smoother and flatter. After grinding and milling, the surface finish of the flat steel blank is significantly improved, which can enhance the overall quality and appearance of the product during the subsequent processing.

[0044] This application also proposes a wide-width high-carbon stainless steel thin plate, which is manufactured by using the method of any one of the above technical solutions.

[0045] The thickness of the prepared wide-width high-carbon stainless steel thin plate is 0.5 mm, the actual size is 0.49 - 0.51 mm, the thickness uniformity is good, the flatness of the thin plate reaches no more than 0.05 mm / m, and there is no edge crack.

[0046] Based on the above embodiments, the flatness of the wide-width high-carbon stainless steel thin plate ≤ 0.05 mm / m. The stainless steel thin plate with high flatness has a high surface finish, reducing surface defects such as scratches and ripples, thus enhancing the appearance quality of the product. In the subsequent processing of the stainless steel thin plate with high flatness, such as cutting, stamping, and welding, it can reduce waste and processing time caused by material unevenness, thereby reducing production costs. And during the assembly process, the stainless steel thin plate with high flatness is easier to closely cooperate with other components, reducing the assembly difficulty and time, and improving production efficiency.

[0047] The present invention has achieved remarkable beneficial effects in the manufacturing process of the wide-width high-carbon stainless steel thin plate by reasonably matching key process parameters such as deformation temperature, deformation passes, deformation amount, and annealing temperature. First, the optimized process parameter combination effectively reduces the rolling passes, improves production efficiency, and reduces energy consumption and production costs. Second, the generation of edge crack defects is completely avoided during the rolling process, significantly improving the surface quality and dimensional accuracy of the product and increasing the finished product rate. Third, by precisely controlling the annealing temperature, the uniformity and stability of the internal structure of the material are ensured, making the product have excellent mechanical properties and corrosion resistance. Fourth, the application of this manufacturing method enables the wide-width high-carbon stainless steel thin plate to fully meet the requirements of the high-end manufacturing field for precision stainless steel thin plates. Finally, this method significantly improves the rolling level of single sheets of high-carbon martensitic steel grades, making the product superior to traditional process products in terms of hardness, strength, wear resistance, etc., providing high-quality material guarantee for applications in fields such as aerospace, precision instruments, and high-end tools.

[0048] The following illustrates this application through specific embodiments.

[0049] Example 1 1. Blank preparation and heating The 95Cr18 high-carbon stainless steel flat steel blank is segmented, and the surface is polished or milled. After processing, the thickness of the blank is 18 mm to 20 mm, the width is 300 mm, and the length is 700 mm.

[0050] 2. Blank heating and hot rolling The polished flat steel blank is heated in a roller hearth furnace at a heating temperature of 1160 °C for 2.5 hours. After reaching the temperature, it is rolled. The deformation per pass is controlled at 2 - 3 mm. When the rolling thickness reaches 5 - 6 mm, to avoid edge cracking due to rapid temperature drop of the thin plate, the semi-finished slab is reheated in the furnace for 20 minutes. After heating, the semi-finished slab is rolled again, and the pass deformation is controlled at 0.5 - 1.0 mm. The hot rolling specification is 3 mm.

[0051] 3. Annealing of hot-rolled billet The hot-rolled slab is annealed in an annealing furnace at a heating temperature of 770 °C for 4 hours, cooled in the furnace to below 500 °C and then taken out for air cooling. Then pickling treatment and spot grinding are carried out to remove the surface scale and local defects of the hot-rolled billet, avoiding the expansion of defects during the processing.

[0052] 4. Cold rolling and intermediate annealing For the first cold rolling pass, the pass deformation is controlled at 0.2 - 0.3 mm, the rolling speed is 0.3 - 0.4 m / s, and the total deformation of the rolling pass is controlled at 50%; then intermediate annealing is carried out at a heating temperature of 770 °C for 4 hours, cooled in the furnace to below 500 °C and then taken out for air cooling. Then pickling treatment and spot grinding are carried out to remove the surface scale and local defects of the hot-rolled billet, avoiding the expansion of defects during the processing.

[0053] For the second cold rolling pass, the pass deformation is controlled at 0.1 - 0.2 mm, the rolling speed is 0.3 - 0.4 m / s, and it is rolled to the target specification of 0.5 mm; then final annealing is carried out at a heating temperature of 770 °C for 4 hours, cooled in the furnace to below 500 °C and then taken out. Then pickling treatment and spot grinding are carried out to remove the surface scale and local defects of the hot-rolled billet.

[0054] 5. Flattening treatment The high-carbon stainless steel thin plate after cold rolling and pickling is flattened and trimmed to obtain a wide-width high-carbon stainless steel single thin plate of 0.5 mm × 1000 mm × 2000 mm.

[0055] 6. The prepared high-carbon stainless steel thin plate has a thickness of 0.5 mm, an actual size of 0.49 - 0.51 mm, good thickness uniformity, the flatness of the thin plate reaches no more than 0.05 mm / m, and there is no edge cracking.

[0056] Example 2 1. Blank preparation and heating The 95Cr18 high-carbon stainless steel flat steel blank is segmented, and the surface is polished or milled. The thickness of the processed blank is 18 mm to 20 mm, the width is 300 mm, and the length is 700 mm.

[0057] 2. Blank heating and hot rolling The polished flat steel blank is heated in a roller hearth furnace at a heating temperature of 1190 °C for 4 hours. After reaching the temperature, it is rolled. The deformation per pass is controlled at 2 - 3 mm. When the rolling thickness reaches 5 - 6 mm, to avoid edge cracking due to rapid temperature drop of the thin plate, the semi-finished slab is reheated in the furnace for 30 minutes. After heating, the semi-finished slab is rolled again, and the pass deformation is controlled at 0.5 - 1.0 mm. The hot rolling specification is 3 mm.

[0058] 3. Annealing of hot-rolled billet The hot-rolled slab is annealed in an annealing furnace at a heating temperature of 790 °C for 6 hours, cooled in the furnace to below 500 °C and then taken out for air cooling. Then pickling treatment and point grinding are carried out to remove the surface scale and local defects of the hot-rolled billet, avoiding the expansion of defects during the processing.

[0059] 4. Cold rolling and intermediate annealing For the first cold rolling pass, the pass deformation is controlled at 0.2 - 0.3 mm, the rolling speed is 0.3 - 0.4 m / s, and the total deformation of the rolling pass is controlled at 50%; then intermediate annealing is carried out at a heating temperature of 790 °C for 6 hours, cooled in the furnace to below 500 °C and then taken out for air cooling. Then pickling treatment and point grinding are carried out to remove the surface scale and local defects of the hot-rolled billet, avoiding the expansion of defects during the processing.

[0060] For the second cold rolling pass, the pass deformation is controlled at 0.1 - 0.2 mm, the rolling speed is 0.3 - 0.4 m / s, and it is rolled to the target specification of 0.5 mm; then final annealing is carried out at a heating temperature of 790 °C for 6 hours, cooled in the furnace to below 500 °C and then taken out, and then pickling treatment and point grinding are carried out to remove the surface scale and local defects of the hot-rolled billet.

[0061] 5. Leveling treatment The high-carbon stainless steel thin plate after cold rolling and pickling is leveled and trimmed to obtain a wide-width high-carbon stainless steel single thin plate of 0.5 mm × 1000 mm × 2000 mm.

[0062] 6. The prepared high-carbon stainless steel thin plate has a thickness of 0.5 mm, an actual size of 0.49 mm to 0.51 mm, good thickness uniformity, the flatness of the thin plate reaches no more than 0.05 mm / m, and there is no edge cracking.

[0063] The above are exemplary embodiments disclosed by the present invention. The order of disclosure of the above embodiments of the present invention is only for description and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of disclosure of the embodiments of the present invention (including the claims) is limited to these examples. Without departing from the scope defined by the claims, various changes and modifications can be made. The functions, steps, and / or actions of the method claims according to the disclosed embodiments herein need not be performed in any specific order. In addition, although the elements disclosed in the embodiments of the present invention may be described or claimed in individual form, they can also be understood as plural unless explicitly limited to the singular form.

[0064] Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other variations in different aspects of the embodiments of the present invention as described above, and they are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included within the protection scope of the embodiments of the present invention.

Claims

1. A manufacturing method of a wide-width high-carbon stainless steel thin plate, characterized in that, It includes the following steps: S1. Blank preparation: Divide and preprocess the flat steel blank; S2. Hot rolling and annealing: Heat the preprocessed flat steel blank to a predetermined temperature and perform rolling. Then, heat the obtained semi-finished slab in the furnace again and perform rolling again, and then perform annealing; S3. Cold rolling and annealing: Cold rolling is carried out in two rolling passes. Intermediate annealing is carried out after the first rolling pass; finish annealing is carried out after the second rolling pass; the reduction per pass in the first rolling pass ≥ the reduction per pass in the second rolling pass; S4. Levelling treatment: Carry out levelling treatment and trimming on the high-carbon stainless steel thin sheet after cold rolling and annealing.

2. The manufacturing method of the wide-width high-carbon stainless steel thin sheet according to claim 1, characterized in that, In step S2, heating the preprocessed flat steel blank to a predetermined temperature and performing rolling includes: heating to 1150 - 1200 °C and holding for 2 - 4 hours, controlling the reduction per pass at 2 - 3 mm, and rolling to a thickness of 5 - 6 mm.

3. The manufacturing method of the wide-width high-carbon stainless steel sheet according to claim 1, characterized in that, In step S2, heating the obtained semi-finished slab in the furnace again and performing rolling again includes: heating the semi-finished slab in the furnace and holding for 20 - 30 minutes, controlling the reduction per pass at 0.5 - 1.0 mm, and rolling to a thickness of 2 - 3 mm.

4. The manufacturing method of the wide-width high-carbon stainless steel thin sheet according to claim 1, characterized in that, The specific cold rolling in the first rolling pass in step S3 includes: controlling the reduction per pass at 0.2 - 0.3 mm, the rolling speed at 0.3 - 0.4 m / s, and controlling the total reduction in the rolling pass at 30 - 50%.

5. The manufacturing method of the wide-width high-carbon stainless steel thin sheet according to claim 1, characterized in that, The specific cold rolling in the second rolling pass in step S3 includes: controlling the reduction per pass at 0.1 - 0.2 mm, the rolling speed at 0.3 - 0.4 m / s, and rolling to a thickness of 0.3 - 0.5 mm.

6. The manufacturing method of the wide-width high-carbon stainless steel thin sheet according to claim 1, characterized in that, Performing annealing in step S2, performing intermediate annealing in step S3 and / or performing finish annealing in step S3 includes: heating temperature 770 - 790 °C, holding for 4 - 6 hours, and cooling in the furnace to below 500 °C and then taking out of the furnace.

7. The manufacturing method of the wide-width high-carbon stainless steel thin plate according to claim 1, characterized in that, After performing annealing in step S2, after performing intermediate annealing in step S3 and / or after performing finish annealing in step S3, air cooling, pickling treatment and skin pass grinding are carried out.

8. The manufacturing method of the wide-width high-carbon stainless steel thin plate according to claim 1, characterized in that, The thickness of the preprocessed blank is 18 - 20 mm, the width is 200 - 300 mm, and the length is 500 - 700 mm; the length of the wide-width high-carbon stainless steel thin sheet is 1500 - 2000 mm, the width is 800 - 1000 mm, the thickness is 0.4 - 0.5 mm; the carbon content of the wide-width high-carbon stainless steel thin sheet is greater than 0.5%.

9. The manufacturing method of the wide-width high-carbon stainless steel thin plate according to claim 1, characterized in that, The preprocessing includes grinding and / or milling treatment.

10. A wide-width high-carbon stainless steel thin plate, characterized in that, Manufactured by the method described in any one of claims 1 - 9 above, the flatness of the wide-width high-carbon stainless steel thin sheet ≤ 0.05 mm / m.

Images