STAINLESS STEEL FOR HIGH PRESSURE HYDROGEN GAS, VESSEL AND EQUIPMENT COMPRISING THE STEEL

摘要

A high-strength stainless steel, having good mechanical properties and corrosion resistance in a high-pressure hydrogen gas environment, and excellent in stress corrosion cracking resistance, and a container or other device for high-pressure hydrogen gas, which is made of the said stainless steel, are provided. The stainless steel is <Bold>characterized in that</Bold> it consists of, by mass %, C: not more than 0.02%, Si: not more than 1.0%, Mn: 3 to 30%, Cr: more than 22% but not more than 30%, Ni: 17 to 30%, V: 0.001to 1.0%, N: 0.10 to 0.50% and Al: not more than 0.10%, and the balance Fe and impurities. Among the impurities, P is not more than 0.030%, S is not more than 0.005%, and Ti, Zr and Hf are not more than 0.01% respectively, and the contents of Cr, Mn and N satisfy the following relationship [1]:<MathDetails id="matha01" num="[1]"><MathText><![CDATA[ <math display="block"><mrow><mtext>5Cr + 3.4Mn ≤ 500N</mtext></mrow></math><img id="ia01" file="imga0001.tif" wi="40" he="3" img-content="math" img-format="tif" /> ]]></MathText></MathDetails> This stainless steel may further contain one or more of Mo, W, Nb, Ta, B, Cu, Co, Mg, Ca, Ce, Y, Sm, Pr and Nd.