A method for preparing high-performance fine-grained 301 stainless steel thin plates

Abstract

This invention belongs to the field of steel materials technology, specifically relating to a method for preparing high-performance fine-grained 301 stainless steel thin plates, comprising the following steps: Step 1: Pre-rolling pulsed current treatment; selecting the plate and subjecting it to pulsed current treatment; Step 2: Cold rolling; placing the plate treated in Step 1 into a cold rolling mill for rolling; Step 3: Pulsed current treatment during rolling; measuring the temperature of the plate treated in Step 2 during rolling, and then adjusting the pulsed current parameters according to the temperature deformation of the plate to control the temperature; Step 4: Cooling; cooling the plate after rolling in Step 3; This invention uses pulsed current rapid heating coupling to cool the plate during cold rolling, significantly refining the grain size of the plate, achieving efficient progress in plate cold rolling, and realizing a good match between plate strength and high toughness; This invention uses pulsed current rapid heating to achieve precise temperature modulation of the plate, avoiding oxidation on the plate surface.

Description

Technical Field

[0001] This invention belongs to the field of steel materials technology, specifically relating to a method for preparing high-performance fine-grained 301 stainless steel thin plates. Background Technology

[0002] 301 stainless steel is a metastable austenitic stainless steel. Under sufficient solution treatment, 301 stainless steel possesses a fully austenitic structure. Among various stainless steel types, 301 stainless steel and heat-resistant steel are widely used in food processing machinery, chemical engineering equipment, nuclear energy equipment, and other fields. Among the many types of stainless steel, 301 is the easiest to cold-work strengthen, significantly improving its strength and hardness after cold working. However, cold working reduces the toughness of 301 stainless steel, exhibiting a "strength-toughness inversion relationship." To achieve a balance between strength and toughness, cold-rolled 301 stainless steel sheets require subsequent heat treatment, similar to "quenching and tempering." Even then, achieving good toughness remains difficult. Furthermore, heat treatment processes typically cause surface oxidation of the cold-rolled sheet. Therefore, a protective atmosphere is needed for the cold-rolled sheet, which undoubtedly increases the cost of material preparation.

[0003] Therefore, it is necessary to provide a method for preparing a high-performance fine-grained 301 stainless steel sheet that can balance the strength and toughness of the sheet and prevent surface oxidation. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing high-performance fine-grained 301 stainless steel thin plates, so as to solve the technical problems of imbalance between plate strength and toughness and oxidation of plate surface during the preparation of thin plates.

[0005] To address the aforementioned technical problems, this invention provides a method for preparing high-performance fine-grained 301 stainless steel thin plates, comprising the following steps: Step 1: Pre-rolling pulse current treatment; selecting a plate and subjecting it to pulse current treatment; Step 2: Cold rolling; placing the plate treated in Step 1 into a cold rolling mill for rolling; Step 3: Pulse current treatment during rolling; measuring the temperature of the plate treated in Step 2 during rolling, and then adjusting the pulse current parameters according to the temperature deformation of the plate to control the temperature; Step 4: Cooling; cooling the plate after rolling in Step 3.

[0006] Furthermore, in step one, the thickness of the selected plate material is 1mm-1.5mm.

[0007] Furthermore, in step one, the pulse current density is 6A / mm²-8A / mm², and the pulse current duty cycle is 0.2.

[0008] Furthermore, in step three, the pulse current density is 10A / mm²-12A / mm², and the pulse current duty cycle is 0.2.

[0009] Furthermore, in step three, when the temperature of the plate is below 500°C, the pulse current generator is activated. The pulse current can quickly bring the plate back to above 600°C, causing some of the plate's structure to recrystallize. Then, cold rolling continues, and the plate will experience a temperature drop. Ultimately, the plate will continuously recrystallize and experience a temperature drop, achieving the effect of "cyclic recrystallization + cyclic deformation," and ultimately achieving fine grains in the plate during the rolling process.

[0010] Furthermore, in step four, before the plate is cooled, the final sample of the rolled plate is subjected to pulse current treatment to rapidly raise the sample temperature to the target temperature, and then the sample is cooled to room temperature.

[0011] Furthermore, in step four, the pulse current density is 10A / mm²-12A / mm², and the pulse current duty cycle is 0.2.

[0012] Furthermore, in step four, the cooling rate of the sample is 10℃ / s-20℃ / s.

[0013] Furthermore, a high-performance fine-grained 301 stainless steel sheet is prepared using the above-described method for preparing high-performance fine-grained 301 stainless steel sheet.

[0014] Furthermore, the present invention provides a method for microscopic characterization testing of the high-performance fine-grained 301 stainless steel sheet. A 10mm × 10mm sample is cut from the high-performance fine-grained 301 stainless steel sheet using a wire cutting device. The sample is ground stepwise up to 2000# using different grades of sandpaper, followed by polishing and etching. The high-performance fine-grained 301 stainless steel sheet sample is then subjected to microscopic characterization testing using SEM.

[0015] The beneficial effects of this invention are: 1. This invention rapidly heats and cools the sheet material during cold rolling by pulsed current coupling. This process is repeated continuously, causing the sheet material to undergo "cyclic recrystallization + cyclic deformation", which significantly refines the grain size of the sheet material, avoids the accumulation of misalignment degree, and allows the work hardening of the sheet material to be "cyclically released", thereby achieving efficient progress in cold rolling of the sheet material and achieving a good match between the strength and high toughness of the sheet material. 2. This invention achieves precise modulation of the target temperature of the board material through the rapid heating effect of pulsed current, and avoids oxidation on the surface of the board material. In summary, this invention achieves high surface quality and high dimensional accuracy in the prepared high-performance fine-grained 301 stainless steel thin plates through ingenious design of pulsed current and optimization of process parameters, providing a good preparation method for high-performance fine-grained 301 stainless steel thin plates. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the microscopic characterization of a high-performance fine-grained 301 stainless steel thin plate sample. Figure 2 This is a graph showing the performance test data of high-performance fine-grained 301 stainless steel sheet. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides a method for preparing high-performance fine-grained 301 stainless steel sheet, comprising the following steps: Step 1: Pre-rolling pulsed current treatment; selecting a sheet material and subjecting it to pulsed current treatment; Step 2: Cold rolling; placing the sheet material treated in Step 1 into a cold rolling mill for rolling; Step 3: Pulsed current treatment during rolling; measuring the temperature of the sheet material treated in Step 2 during rolling, and then adjusting the pulsed current parameters according to the temperature deformation of the sheet material to control the temperature; Step 4: Cooling; cooling the sheet material after rolling in Step 3; This invention rapidly heats and cools the sheet material during cold rolling by pulsed current coupling, continuously performing this operation to cause the sheet material to undergo "cyclic recrystallization + cyclic deformation," significantly refining the grain size of the sheet material, avoiding the accumulation of dislocation degree, and allowing the work hardening of the sheet material to be "cyclically released," thereby achieving efficient progress in cold rolling of the sheet material and achieving a good match between the strength and high toughness of the sheet material. This invention achieves precise modulation of the target temperature of the sheet material through the rapid heating effect of pulsed current, and avoids oxidation on the surface of the sheet material. In summary, through the ingenious design of pulsed current and the optimization of process parameters, this invention achieves high surface quality and high dimensional accuracy of the prepared high-performance fine-grained 301 stainless steel sheet, providing a good preparation method for high-performance fine-grained 301 stainless steel sheet.

[0020] In step one, the thickness of the selected plate is 1mm-1.5mm.

[0021] In step one, the pulse current density is 6A / mm2-8A / mm2, and the pulse current duty cycle is 0.2.

[0022] In step three, the pulse current density is 10A / mm²-12A / mm², and the pulse current duty cycle is 0.2.

[0023] In step three, when the temperature of the plate is below 500°C, the pulse current generator is activated. The pulse current can quickly bring the plate back to above 600°C, causing some of the plate's structure to recrystallize. Then, cold rolling continues, and the plate will experience a temperature drop. Ultimately, the plate will continuously recrystallize and cool down, achieving the effect of "cyclic recrystallization + cyclic deformation," and finally achieving fine grains in the plate during the rolling process.

[0024] In step four, before the plate is cooled, the final sample of the rolled plate is subjected to pulse current treatment to rapidly raise the sample temperature to the target temperature, and then the sample is cooled to room temperature.

[0025] In step four, the pulse current density is 10A / mm²-12A / mm², and the pulse current duty cycle is 0.2.

[0026] In step four, the cooling rate of the sample is 10℃ / s-20℃ / s.

[0027] High-performance fine-grained 301 stainless steel sheet prepared using the above-described method.

[0028] This invention provides a method for microscopic characterization testing of the high-performance fine-grained 301 stainless steel sheet. A 10mm × 10mm sample is cut from the high-performance fine-grained 301 stainless steel sheet using a wire cutting device. The sample is then ground stepwise up to 2000# using different grades of sandpaper, followed by polishing and etching. The microscopic characterization test of the high-performance fine-grained 301 stainless steel sheet sample is performed using SEM.

[0029] The following detailed description of the preparation method of pseudoboehmite provided by the present invention, in conjunction with the embodiments, should not be construed as limiting the scope of protection of the present invention. Example

[0030] Step 1, Pulse current treatment before rolling: Select the plate with a thickness of 1mm and perform pulse current treatment (pulse current density is 6A / mm2, pulse current duty cycle is 0.2). Step 2, cold rolling: The sheet material processed in Step 1 is placed in a cold rolling mill for rolling; Step 3, pulse current treatment during rolling: Temperature measurement is performed on the plate after the treatment in Step 2 during the rolling process. Then, the plate is deformed by temperature, and the pulse current parameters (pulse current density is 10A / mm2, pulse current duty cycle is 0.2) are adjusted to control the temperature and perform "cyclic recrystallization + cyclic deformation". Step 4, Cooling: Using pulsed current (pulse current density of 10A / mm2, pulse current duty cycle of 0.2), the temperature of the final sample of the plate is rapidly raised to the target temperature, and then cooled to room temperature. The cooling rate of the plate is 10℃ / s, and then the high-performance fine-grained 301 stainless steel sheet is prepared.

[0031] like Figure 2 As shown, the performance of the high-performance fine-grained 301 stainless steel sheet was tested. The results showed that the high-performance fine-grained 301 stainless steel sheet prepared by the present invention has a tensile strength of 2601 MPa and an elongation of 12.5%. In addition, the high-performance fine-grained 301 stainless steel sheet prepared by the present invention has almost no oxidation and high dimensional accuracy. Example

[0032] Step 1, pre-rolling pulse current treatment: Select the plate with a thickness of 1.5mm and perform pulse current treatment (pulse current density is 8A / mm2, pulse current duty cycle is 0.2).

[0033] Step 2, cold rolling: The sheet material processed in Step 1 is placed in a cold rolling mill for rolling.

[0034] Step 3, pulse current treatment during rolling: Temperature is measured during the rolling process of the plate after the treatment in Step 2. Then, the plate is deformed by temperature, and the pulse current parameters (pulse current density is 12A / mm2, pulse current duty cycle is 0.2) are adjusted to control the temperature and perform "cyclic recrystallization + cyclic deformation".

[0035] Step 4, Cooling: Using pulsed current (pulse current density of 12A / mm2, pulse current duty cycle of 0.2), the temperature of the final sample of the plate is rapidly raised to the target temperature, and then cooled to room temperature. The cooling rate of the plate is 20℃ / s, and then the high-performance fine-grained 301 stainless steel sheet is prepared.

[0036] like Figure 2 As shown, the performance of the high-performance fine-grained 301 stainless steel sheet was tested. The results showed that the tensile strength of the high-performance fine-grained 301 stainless steel sheet prepared by the present invention was 2545 MPa and the elongation was 15%. In addition, the high-performance fine-grained 301 stainless steel sheet prepared by the present invention had almost no oxidation and high dimensional accuracy. Example

[0037] Step 1, pre-rolling pulse current treatment: Select the plate with a thickness of 1.2mm and perform pulse current treatment (pulse current density is 9A / mm2, pulse current duty cycle is 0.2).

[0038] Step 2, cold rolling: The sheet material processed in Step 1 is placed in a cold rolling mill for rolling.

[0039] Step 3, pulse current treatment during rolling: Temperature is measured during the rolling process of the plate after the treatment in Step 2. Then, the plate is deformed by temperature, and the pulse current parameters (pulse current density is 10A / mm2, pulse current duty cycle is 0.2) are adjusted to control the temperature and perform "cyclic recrystallization + cyclic deformation".

[0040] Step 4, Cooling: Using pulsed current (pulse current density of 10A / mm2, pulse current duty cycle of 0.2), the temperature of the final sample of the plate is rapidly raised to the target temperature, and then cooled to room temperature. The cooling rate of the plate is 20℃ / s, and then the high-performance fine-grained 301 stainless steel sheet is prepared.

[0041] like Figure 2As shown, the performance of the high-performance fine-grained 301 stainless steel sheet was tested. The results showed that the tensile strength of the high-performance fine-grained 301 stainless steel sheet prepared by the present invention was 2512 MPa and the elongation was 11%. In addition, the high-performance fine-grained 301 stainless steel sheet prepared by the present invention had almost no oxidation and high dimensional accuracy. Example

[0042] like Figure 1 As shown, the microscopic characterization test of the high-performance fine-grained 301 stainless steel sheet was performed by cutting 10mm × 10mm samples from the sheet using a wire cutting device. The samples were then ground stepwise with different grades of sandpaper up to 2000#, followed by polishing and etching. The microscopic characterization test of the high-performance fine-grained 301 stainless steel sheet samples was performed using SEM. The results show that compared with the traditional process, the high-performance fine-grained 301 stainless steel sheet prepared by this invention has a finer grain size, which improves the dimensional accuracy and product quality of the high-performance fine-grained 301 stainless steel sheet.

[0043] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A method for preparing high-performance fine-grained 301 stainless steel thin plates, characterized in that, Includes the following steps: Step 1: Pre-rolling pulse current treatment; Select the sheet material and perform pulse current treatment on the sheet material; Step 2: Cold rolling; The sheet material processed in Step 1 is placed in a cold rolling mill for rolling; Step 3: Pulse current handling during rolling; Temperature is measured during the rolling process of the plate after step two, and then the plate is adjusted according to temperature deformation to control the temperature by adjusting the pulse current parameters. Step 4: Cooling; Cooling the sheet material after rolling in Step 3; In step one, the thickness of the selected plate is 1mm-1.5mm; In step one, the pulse current density is 6 A / mm. 2 -8A / mm 2 The duty cycle of the pulse current is 0.2; In step three, the pulse current density is 10 A / mm. 2 -12A / mm 2 The duty cycle of the pulse current is 0.2; In step three, when the temperature of the plate is below 500°C, the pulse current generator is activated. The pulse current can quickly bring the plate back to above 600°C, causing some of the plate's structure to recrystallize. Then, cold rolling continues, and the plate will experience a temperature drop, ultimately causing the plate to continuously recrystallize and cool down. In step four, before the plate is cooled, the final sample of the rolled plate is subjected to pulse current treatment to rapidly raise the sample temperature to the target temperature, and then the sample is cooled to room temperature. In step four, the pulse current density is 10 A / mm. 2 -12A / mm 2 The duty cycle of the pulse current is 0.2; In step four, the cooling rate of the sample is 10℃ / s-20℃ / s.

2. The method for preparing high-performance fine-grained 301 stainless steel thin plates as described in claim 1, characterized in that, The microscopic characterization test method for high-performance fine-grained 301 stainless steel thin plates is as follows: A 10mm × 10mm sample was cut from the high-performance fine-grained 301 stainless steel sheet using a wire cutting device. The sample was then ground step by step up to 2000# using different grades of sandpaper, followed by polishing and etching. The high-performance fine-grained 301 stainless steel sheet sample was characterized by microscopic testing using SEM.

3. The high-performance fine-grained 301 stainless steel sheet prepared by the method for preparing high-performance fine-grained 301 stainless steel sheet as described in claim 1.

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