AUSTENITIC STAINLESS STEEL AND MANUFACTURING METHOD THEREFOR

Title:

AUSTENITIC STAINLESS STEEL AND MANUFACTURING METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2016/068009

Kind Code:

A1

Abstract:

Provided is a high strength austenitic stainless steel with favorable hydrogen embrittlement resistance and hydrogen fatigue resistance. For the austenitic stainless steel, the chemical composition contains, in mass%, at least one of C: not more than 0.10%, Si: not more than 1.0%, Mn: at least 3.0% and less than 7.0%, Cr: 15-30%, Ni: at least 12.0% and less than 17.0%, Al: not more than 0.10%, N: 0.10-0.50%, P: not more than 0.050%, S: not more than 0.050%, V: 0.01-1.0%, Nb: 0.01-0.50%, etc. with the remainder being Fe and impurities. The ratio of the minor axis to the major axis of the austenite crystal particles is greater than 0.1. The crystal grain size number of the austenite crystal particles is at least 8.0. Tensile strength is at least 1000 MPa.

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Inventors:

NAKAMURA JUN (JP)
OMURA TOMOHIKO (JP)
HIRATA HIROYUKI (JP)
JOTOKU KANA (JP)
OSUKI TAKAHIRO (JP)

Application Number:

PCT/JP2015/079800

Publication Date:

May 06, 2016

Filing Date:

October 22, 2015

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

C22C38/00; C21D8/00; C22C38/58

Domestic Patent References:

WO2004111285A1

2004-12-23

Foreign References:

JP5131794B2	2013-01-30
JPH0711389A	1995-01-13

Other References: