Cr-based stainless steel having excellent hydrogen embrittlement resistance

Abstract

A Cr-based stainless steel sheet includes: 0.020 mass % or less of C; 1.00 mass % or less of Si; 1.00 mass % or less of Mn; 0.040 mass % or less of P; 0.0030 mass % or less of S; 10.0 to 18.0 mass % of Cr; 0.020 mass % or less of N; 0.10 mass % or less of Al; and one or both of 0.5 mass % or less of Nb and 0.5 mass % or less of Ti; in which a texture in a sheet surface satisfies (i) and (ii) below. (i) In the sheet surface, an area ratio of crystal grains ({211}±10-degree-oriented grains) whose orientation difference between a normal direction of the surface and a {211}-plane orientation is 10 degrees or less is less than 30%. (ii) For the {211}±10-degree-oriented grains, a length in a rolling direction and a length in a sheet width direction are each less than 0.15 mm on average.

Description

TECHNICAL FIELD[0001]The present invention relates to a Cr-based stainless steel sheet with excellent hydrogen embrittlement resistance, specifically to a Cr-based stainless steel sheet suitable for metals for high pressure hydrogen gaseous equipment.BACKGROUND ART[0002]In recent years, it has been strongly desired to reduce generation of greenhouse gases mainly including carbon dioxide in order to cope with extreme weather that is partly due to global warming. As part of this move, development of automobiles and transport equipment that use a fuel cell as a power source has been in progress. The fuel cell, which generates electric power by using hydrogen as fuel, does not generate carbon dioxide and achieves high energy conversion efficiency, thereby being regarded as a promising power source.[0003]In the fuel cell using hydrogen as fuel and equipment such as a hydrogen station supplying hydrogen thereto, components are exposed to a hydrogen gaseous environment. In metals exposed t...

AI Technical Summary

Benefits of technology

This invention provides a stainless steel sheet made of Cr-based material that has good strength at low temperatures and can withstand high levels of hydrogen gas. This sheet material is ideal for use in high-pressure hydrogen gas equipment.

Problems solved by technology

In addition, the Cr-based stainless steel disclosed in Non-Patent Literature 1 is prone to hydrogen embrittlement and thus does not have hydrogen embrittlement resistance for use in the high pressure hydrogen gas.

The Cr-based stainless steel also has a problem of the low-temperature embrittlement.