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Method for preparing nanocrystalline austenitic stainless steel plate through deep cooling rolling-rapid annealing

A technology of austenitic stainless steel and stainless steel plate, applied in the field of stainless steel manufacturing, can solve the problems of excessive deformation and small sample size, and achieve the effect of solving excessive deformation, simple manufacturing method and low energy consumption

Active Publication Date: 2017-02-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, this process can also be used in the field of nanocrystalline preparation of non-ferrous metals with a face-centered cubic structure, solving the problems of excessive deformation or small sample size in other processes during cold working at room temperature, and preparing high-strength and toughness nanocrystalline austenitic stainless steel plate

Method used

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  • Method for preparing nanocrystalline austenitic stainless steel plate through deep cooling rolling-rapid annealing
  • Method for preparing nanocrystalline austenitic stainless steel plate through deep cooling rolling-rapid annealing
  • Method for preparing nanocrystalline austenitic stainless steel plate through deep cooling rolling-rapid annealing

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Embodiment 1

[0044] A method for preparing nanocrystalline austenitic stainless steel plate by cryogenic rolling-rapid annealing, specifically comprising the steps of:

[0045] Step 1, hot rolling:

[0046] (1) Heat a 50mm thick 304 austenitic stainless steel billet at 1150°C for 4 hours; where:

[0047] The 304 austenitic stainless steel plate contains the following components and their mass percentages: C: 0.08%, Si: 0.75%, Mn: 2.0%, Cr: 18.45%, Ni: 8.0%, P: 0.0045%, S: 0.003, the balance is Fe and unavoidable impurities;

[0048](2) The austenitic stainless steel slab after heat preservation is subjected to 7 passes of hot rolling, the starting rolling temperature is 1170°C, the final rolling temperature is 1000°C, the total cumulative reduction rate is 90%, and then the cooling rate is 25°C / s water cooling to 150°C, then air cooling to room temperature to produce a 5mm thick hot-rolled sheet;

[0049] Step 2, cryogenic rolling:

[0050] (1) Solution treatment: Cut the hot-rolled p...

Embodiment 2

[0060] A method for preparing nanocrystalline austenitic stainless steel plate by cryogenic rolling-rapid annealing, specifically comprising the steps of:

[0061] Step 1, hot rolling:

[0062] (1) Heat a 50mm thick 304 austenitic stainless steel billet at 1250°C for 3 hours; where:

[0063] The 304 austenitic stainless steel plate contains the following components and their mass percentages: C: 0.08%, Si: 0.75%, Mn: 2.0%, Cr: 18.45%, Ni: 8.0%, P: 0.0045%, S: 0.003, the balance is Fe and unavoidable impurities;

[0064] (2) The austenitic stainless steel slab after heat preservation is subjected to 7 passes of hot rolling, the starting rolling temperature is 1170°C, the final rolling temperature is 1000°C, the total cumulative reduction rate is 90%, and then the cooling rate is 35°C / s water cooled to 200°C, then air-cooled to room temperature to produce a 5mm thick hot-rolled sheet;

[0065] Step 2, cryogenic rolling:

[0066] (1) Solution treatment: Cut the hot-rolled pl...

Embodiment 3

[0076] A method for preparing nanocrystalline austenitic stainless steel plate by cryogenic rolling-rapid annealing, specifically comprising the steps of:

[0077] Step 1, hot rolling:

[0078] (1) Heat a 50mm thick 304 austenitic stainless steel billet at 1150°C for 4 hours; where:

[0079] The 304 austenitic stainless steel plate contains the following components and their mass percentages: C: 0.08%, Si: 0.5%, Mn: 1.24%, Cr: 19.07%, Ni: 7.98%, P: 0.0068%, S: 0.0062%, the balance is Fe and unavoidable impurities;

[0080] (2) The austenitic stainless steel slab after heat preservation is subjected to 7 passes of hot rolling, the starting rolling temperature is 1170°C, the final rolling temperature is 1000°C, the total cumulative reduction rate is 90%, and then the cooling rate is 30°C / s of water cooled to 180 ° C, air-cooled to room temperature, made of 5mm thick hot-rolled sheet; the metallographic structure of the hot-rolled sheet is as follows figure 2 shown;

[0081...

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Abstract

The invention provides a method for preparing a nanocrystalline austenitic stainless steel plate through deep cooling rolling-rapid annealing and belongs to the field of stainless steel manufacturing. The method comprises the steps that (1) an austenitic stainless steel blank is hot-rolled after being subjected to heat preservation at the temperature of 1150 DEG C-1250 DEG C and then is air-cooled to the room temperature after being water-cooled to 150 DEG C-200 DEG C, and a hot-rolled plate is prepared; (2) deep cooling rolling is conducted, specifically, the hot-rolled plate is subjected to solid solution treatment, after an oxide layer on the surface is removed, deep cooling rolling is conducted, the steel plate is subjected to liquid nitrogen treatment before cold rolling per pass, and a deep cooling rolled stainless steel plate is prepared; and (3) the deep cooling rolled stainless steel plate is air-cooled to the room temperature after being subjected to heat preservation at the temperature of 600 DEG C-850 DEG C, so that the nanocrystalline austenitic stainless steel plate is prepared. The yield strength of the stainless steel plate prepared by the method is 956-1170 MPa, the tensile strength is 1130-1380 MPa, the percentage elongation after fracture is 18%-52%, and the product of strength and elongation is 55000-58080 MPa.%. According to the method for preparing the nanocrystalline austenitic stainless steel plate through deep cooling rolling-rapid annealing, the time is short; the efficiency is high; energy sources are saved; the cost is low; and a sample piece large in section size is easy to produce.

Description

technical field [0001] The invention belongs to the field of stainless steel manufacturing, and in particular relates to a method for preparing nanocrystalline austenitic stainless steel plates by cryogenic rolling and rapid annealing. Background technique [0002] Austenitic stainless steel refers to stainless steel that contains about 18wt% Cr, 8-10wt% Ni, and about 0.1wt% C, has a face-centered cubic crystal structure, and has a stable austenite structure in use. With the development of the economy, the application of stainless steel is becoming more and more widely. Austenitic stainless steel can form a dense oxide film due to its high content of chromium and nickel. At the same time, it has high thermal strength and is non-magnetic, so austenitic stainless steel Compared with other stainless steels, stainless steel has better corrosion resistance, plasticity, high temperature performance, formability, and welding performance. It has become the stainless steel with the l...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/58C22C38/40C22C38/02C22C38/04
CPCC21D8/0226C21D8/0236C21D8/0268C21D8/0273C21D2201/03C21D2211/001C22C38/02C22C38/04C22C38/40C22C38/58
Inventor 吴红艳艾峥嵘李美玲孙国胜胡军杜林秀
Owner NORTHEASTERN UNIV
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