HIGH-STRENGTH STAINLESS STEEL, CONTAINER AND HARDWARE MADE OF SUCH STEEL

摘要

A high-strength stainless steel having excellent mechanical properties and corrosion resistance in high-pressure hydrogen gas environments is disclosed . A container for high-pressure hydrogen gas made of such a stainless steel is also disclosed. The stainless steel has a chemical composition comprising, i n mass %, C: not more than 0.04%, Si: not more than 1.0%, Mn: 7-30%, Cr: 15-22 %, Ni: 5-20%, V: 0.001-1.0%, N: 0.20-0.50%, Al: not more than 0.10%, and the balance: Fe and unavoidable impurities including not more than 0.030% of P, not more than 0.005% of S, and respectively not more than 0.01% of Ti, Zr an d Hf. The contents of Cr, Mn and N satisfy the following relation: 2.5Cr + 3.4 Mn <= 300N. A welded joint of a container for high-pressure hydrogen gas or a hardware which is made of this stainless steel is characterized in that the welded metal satisfies the following relation: -11 <= Nieq -1.1 .times. C req <= -8.