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Stainless steel for passenger cars and method for producing same

A manufacturing method and technology of austenitic stainless steel, applied in the field of high-grade austenitic stainless steel and its manufacturing process

Inactive Publication Date: 2012-08-29
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This document does not mention the specific production process, but mentions that the alloying element niobium should be added to improve the intergranular corrosion resistance and prolong the carbide precipitation time after quenching and tempering treatment

Method used

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  • Stainless steel for passenger cars and method for producing same
  • Stainless steel for passenger cars and method for producing same

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Embodiment Construction

[0040] The chemical composition of the embodiment of the present invention is shown in Table 5, the process parameters of each process are shown in Table 6, and the process parameters of the heat treatment and annealing process of each strength level are shown in Table 7-10. Among them, C≤0.03%, Si: 0.3-1.0%, Mn: 0.6-1.5%, S≤0.030%, P≤0.040%, Cr: 16.0-18.0%, Ni: 5.5-7.5%, N: 0.1-0.22% , Cu: 0.2-0.6%, and satisfy Md30 between 20-45°C. The mechanical properties of the examples are shown in Table 11.

[0041] The chemical composition of table 5 embodiment

[0042] Example

C

Si

mn

Cr

Ni

N

Cu

Md30

1

0.014

0.5

1.0

16.5

6.8

0.18

0.1

20

2

0.010

0.7

1.1

17.1

6.8

0.15

0.3

25

3

0.018

0.5

1.0

17.0

6.3

0.15

0.4

30

4

0.02

0.5

1.02

17.21

6....

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Abstract

The invention relates to an austenitic stainless steel for passenger cars, which comprises chemical compositions in mass percent: not more than 0.03% of C, 0.3-0.9% of Si, 0.6-1.5% of Mn, 16.0-18.0% of Cr, 5.5-7.5% of Ni, 0.1-0.22% of N, 0.1-0.6% of Cu, not more than 0.040% of P, no more than 0.03% of S, and the balance of Fe and unavoidable impurity elements; and moreover, Md is between 20-45 DEG C. A method for producing the stainless steel comprises the steps that a steel ingot or a slab is produced; then, the steel ingot or the slab is heated by a heating furnace to 1210-1270 DEG C, and the heating time is between 1-2 minute / mm; the steel ingot or the slab is rolled into a strip steel or a plate after being thermally deformed within the scope of 900-1200 DEG C; solid solution treatment and acid washing are carried out within the temperature scope of 1050-1150 DEG C, and the thermal treatment time is determined every 3-5 minutes according to the thickness of each millimeter; and next, cold rolling is carried out, 80% of austenite is enabled to be converted into deformed martensite after the cold rolling, the total rolling reduction of cold rolling is generally 60-80%, and the temperature of a material is controlled not to be higher than 45 DEG C during the cold rolling process.

Description

technical field [0001] The invention relates to austenitic stainless steel, in particular to austenitic stainless steel of different strength grades used for car bodies of train passenger cars, subway vehicles and the like and a manufacturing process thereof. Background technique [0002] The materials used for passenger cars and subway vehicles are mainly aluminum alloy and stainless steel. With the continuous enhancement of people's awareness of safety and environmental protection, stainless steel is becoming more and more popular as a car body material. Stainless steel used as car body material has the characteristics of high strength, high corrosion resistance, good plate shape flatness, excellent processing performance and fire prevention. At present, the materials used for stainless steel passenger cars and subway vehicles at home and abroad are mostly metastable austenitic stainless steel 00Cr17Ni7 type, the Japanese standard is SUS301L, and the European standard is ...

Claims

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Application Information

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IPC IPC(8): C22C38/42C21D8/02
Inventor 黄俊霞叶晓宁王如萌
Owner BAOSHAN IRON & STEEL CO LTD
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