Importance

Loading Importance Indicators...

Abstract

Disclosed is a martensitic stainless steel material for a hydrogen gas environment, having a composition consisting of: 0.03 mass %≤C≤1.20 mass %, Si≤1.00 mass %, Mn≤1.50 mass %, P≤0.060 mass %, S≤0.250 mass %, Cu≤0.50 mass %, 8.0 mass %≤Cr≤22.0 mass %, Ni≤1.00 mass %, and N≤0.40 mass %, and optionally at least one selected from the group consisting of: Mo≤3.00 mass %, V≤1.50 mass %, Nb≤1.00 mass %, Pb≤0.30 mass %, and B≤0.0500 mass %, with the balance being Fe and inevitable impurities; having: a content of a precipitate of 1.50 mass % or more, a crystal grain size number of prior austenite grains of 2.0 or more, a metal structure including a martensite structure, a tensile strength of 1,800 MPa or less, and satisfying D_H2(0.7)/D_air≥0.8.

Loading the Abstract Image...

First Claim