High strength austenitic stainless steel having excellent resistance to hydrogen embrittlement, method for manufacturing the same, and hydrogen equipment used for high-pressure hydrogen gas and liquid hydrogen environment

Patent metadata

Field	Value
Publication number	US-11603573-B2
Application number	US-202117466575-A
Country	US
Kind code	B2
Filing date	Sep 3, 2021
Priority date	Mar 26, 2015
Publication date	Mar 14, 2023
Grant date	Mar 14, 2023

Abstract

This high strength austenitic stainless steel having excellent resistance to hydrogen embrittlement includes, in terms of mass %, C: 0.2% or less, Si: 0.2% to 1.5%, Mn: 0.5% to 2.5%, P: 0.06% or less, S: 0.008% or less, Ni: 10.0% to 20.0%, Cr: 16.0% to 25.0%, Mo: 3.5% or less, Cu: 3.5% or less, N: 0.01% to 0.50%; and O: 0.015% or less, with the balance being Fe and unavoidable impurities, in which an average size of precipitates is 100 nm or less and an amount of the precipitates is 0.001% to 1.0% in terms of mass %.

First claim

The invention claimed is:

1. A hydrogen equipment for a hydrogen gas and liquid hydrogen environment, comprising an austenitic stainless steel having resistance to hydrogen embrittlement,
wherein the austenitic stainless steel having resistance to hydrogen embrittlement comprises, in terms of mass %:
C: 0.2% or less;
Si: 0.2% to 1.5%;
Mn: 0.5% to 2.5%;
P: 0.042% or less;
S: 0.008% or less;
Ni: 10.0% to 20.0%;
Cr: 16.0% to 19.1%;
Mo: 3.5% or less;
Cu: 1.52% or less;
N: 0.01% to 0.50%; and
O: 0.015% or less,
with a balance being Fe and unavoidable impurities,
wherein an average size of precipitates is 100 nm or less and an amount of the precipitates is 0.001% to 1.0% in terms of mass %.

2. The hydrogen equipment for a hydrogen gas and liquid hydrogen environment according to claim 1 , wherein the austenitic stainless steel having resistance to hydrogen embrittlement further comprises one or more of, in terms of mass %,
Al: 0.3% or less,
Mg: 0.01% or less,
Ca: 0.01% or less,
REM: 0.10% or less, and
B: 0.008% or less.

3. The hydrogen equipment for a hydrogen gas and liquid hydrogen environment according to claim 1 , wherein the austenitic stainless steel having resistance to hydrogen embrittlement further comprises one or more of, in terms of mass %,
Ti: 0.5% or less,
Nb: 0.5% or less, and
V: 0.5% or less.

4. The hydrogen equipment for a hydrogen gas and liquid hydrogen environment according to claim 2 , wherein the austenitic stainless steel having resistance to hydrogen embrittlement further comprises one or more of, in terms of mass %,
Ti: 0.5% or less,
Nb: 0.5% or less, and
V: 0.5% or less.

Assignees

• Nippon Steel Stainless Steel Corp

Inventors

• Matsumoto Kazuhisa
• Hatano Masaharu

Classifications

• C21D8/00

  Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) · CPC title

• F17C2203/0643

  Stainless steels · CPC title

• C21D9/0068 Primary

  for particular articles not mentioned below · CPC title

• C22C38/54

  with boron · CPC title

• C22C38/005

  containing rare earths, i.e. Sc, Y, Lanthanides · CPC title