Austenic stainless steel and method for manufacturing same

A technology of austenitic stainless steel and a manufacturing method, which is applied in manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of reducing steel plasticity and corrosion resistance, high process cost and labor cost, poor corrosion resistance, etc. , to achieve the effect of reducing martensite content, low annealing temperature and improving corrosion resistance

Active Publication Date: 2008-11-26
BAOSTEEL DESHENG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the production of austenitic stainless steel for vehicles often requires high process costs and man-hour costs
In addition, the austenitic stainless steel matrix contains 20% to 22% martensite after cold rolling with a reduction of about 19% to 25%. Martensite reduces the plasticity and corrosion resistance of the steel. When the tensile strength meets the requirements, the elongation is less

Method used

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  • Austenic stainless steel and method for manufacturing same
  • Austenic stainless steel and method for manufacturing same
  • Austenic stainless steel and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. An austenitic stainless steel, the weight percentage of its chemical composition is: C: 0.008%, Si: 0.3%, Mn: 0.6%, Cr: 18%, Ni: 7.5%, N: 0.1%, P≤ 0.040%, S≤0.03%, the rest is Fe and unavoidable impurity elements, among them, Md30=413-9.5(%Ni)-13.7(%Cr)-8.1(%Mn)-9.2(%Si)-462( The value of %C+%N) is 20.

[0037] 2. (See figure 2 ) The manufacturing method of the austenitic stainless steel comprises the steps:

[0038] (1) Preparing steel ingots or slabs according to the weight percentage distribution of the above-mentioned chemical components;

[0039] (2) Hot rolling, heated in a heating furnace, the temperature range is 1210 ° C, and rolled into strip steel or flat plate after thermal deformation at 900 ° C;

[0040] (3) Annealing and pickling, solution heat treatment at a temperature of 1000 ° C, and the heat treatment time is determined according to 5 minutes / mm;

[0041] (4) cold rolling, cold rolling reduction is 50%;

[0042] (5) Heat treatment and pickli...

Embodiment 2

[0044] 1. An austenitic stainless steel, the weight percentage of its chemical composition is: C: 0.02%, Si: 0.5%, Mn: 1.0%, Cr: 17.0%, Ni: 7%, N: 0.12%, P≤ 0.040%, S≤0.03%, the rest is Fe and unavoidable impurity elements, among them, Md30=413-9.5(%Ni)-13.7(%Cr)-8.1(%Mn)-9.2(%Si)-462( The value of %C+%N) is 36.

[0045] 2. The manufacturing method of the austenitic stainless steel comprises the following steps:

[0046] (1) Preparing steel ingots or slabs according to the weight percentage distribution of the above-mentioned chemical components;

[0047] (2) Hot rolling, heated in a heating furnace, the temperature range is 1230 ° C, and rolled into strip steel or flat plate after thermal deformation at 1000 ° C;

[0048] (3) Annealing and pickling, solution heat treatment at a temperature of 1000 ° C, and the heat treatment time is determined according to 4 minutes / mm;

[0049] (4) cold rolling, cold rolling reduction is 50%;

[0050] (5) Heat treatment and pickling, pic...

Embodiment 3

[0052] 1. An austenitic stainless steel, the weight percentage of its chemical composition is: C: 0.008%, Si: 0.3%, Mn: 0.6%, Cr: 18%, Ni: 7.5%, N: 0.1%, P≤ 0.040%, S≤0.03%, the rest is Fe and unavoidable impurity elements, among them, Md30=413-9.5(%Ni)-13.7(%Cr)-8.1(%Mn)-9.2(%Si)-462( The value of %C+%N) is 38.

[0053] 2. The manufacturing method of the austenitic stainless steel comprises the following steps:

[0054] (1) Preparing steel ingots or slabs according to the weight percentage distribution of the above-mentioned chemical components;

[0055] (2) Hot rolling, heated in a heating furnace, the temperature range is 1250 ° C, and rolled into strip steel or flat plate after thermal deformation at 1050 ° C;

[0056] (3) Annealing and pickling, performing solution heat treatment at a temperature of 1100 ° C, and the heat treatment time is determined according to 3.5 minutes / mm;

[0057] (4) Cold rolling, the cold rolling reduction is 55%;

[0058] (5) Heat treatment ...

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PUM

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Abstract

The invention discloses an austenitic stainless steel and a manufacturing method thereof. The weight percentages of the chemical components of the stainless steel are as follows: C, less than or equal to 0.03 percent; Si, 0.3 to 0.9 percent; Mn, 0.6 to 1.5 percent; Cr, 16.0 to 18.0 percent; Ni, 5.5 to 7.5 percent; N, 0.1 to 0.25 percent; P, less than or equal to 0.040 percent; S, less than or equal to 0.03 percent; the rest, Fe and inevitable impurity elements; wherein, the numerical value of Md30 is 20 to 60. The manufacturing method of the stainless steel is as follows: 1) preparation of ingots or slabs; 2) hot rolling; 3) annealing and acid pickling; 4) cold rolling with the reduction no less than 50 percent; 5) heat treatment and acid pickling. The method can lead the material elongation reach above 25 percent and improve the corrosion resistance of high-strength austenitic stainless steel used in vehicles and the processing and manufacture performance of steel.

Description

technical field [0001] The invention relates to an austenitic stainless steel and a manufacturing method thereof, in particular to high-strength austenitic stainless steel and a manufacturing method thereof for car bodies such as trains, passenger cars, and rail transit vehicles. Background technique [0002] The materials used for train passenger cars and rail transit vehicles mainly include carbon steel, aluminum alloy and stainless steel. With the increasing call for reducing vehicle weight and reducing comprehensive life cycle costs, stainless steel is showing more and more advantages as a vehicle body material. The stainless steel material used for the car body should have the characteristics of high strength, high corrosion resistance, good plate shape flatness, excellent processing performance and fire prevention. At present, most of the stainless steel materials used in trains and rail vehicles at home and abroad are austenitic stainless steel Cr17Ni7, the Japanese ...

Claims

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Application Information

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IPC IPC(8): C22C38/40C21D8/00C21D11/00B21B37/00
Inventor 黄俊霞叶晓宁沈春飞
Owner BAOSTEEL DESHENG STAINLESS STEEL
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