MARTENSITIC STAINLESS STEEL WITH EXCELLENT WELD CHARACTERISTICS, AND MARTENSITIC STAINLESS STEEL MATERIAL

摘要

This martensitic stainless steel contains, in terms of percent by mass: C:0.003%to 0.03%; Si: 0.01% to 1.0%; Mn: 3.0% to 6.0%; P: 0.05% or less; S: 0.003% orless; Ni:1.0% to 3.0%; Cr: 15.0% to 18.0%; Mo: 0% to 1.0%; Cu: 0% to 2.0%; Ti: 0% to0.05%;N: 0.05% or less; Al: 0.001% to 0.1%; and O: 0.005% or less, with a remainderbeing Feand inevitable impurities, wherein a total amount of C and N is in a range of0.060% orless, .gamma. max represented by the formula 1 is in a range of 80 or more,and .gamma. pot represented bythe formula 2 is in a range of 60 to 90..gamma. max = 420 × C% + 470 × N% + 23 × Ni% + 9 × Cu%+ 7 × Mn% - 11.5 ×Cr% - 11.5 × Si% - 52 × Al% + 189 .multidot. Formula 1.gamma. pot = 700 × C% + 800 × N% + 10 × (Mn% + Cu%) + 20× Ni% - 9.3 × Si% - 6.2× Cr% - 9.3 × Mo% - 74.4 × Ti% - 37.2 × Al% + 63.2.multidot. Formula 2Here, C%, N%, Ni%, Cu%, Mn%, Cr%, Si%, Al%, Mo%, and Ti% represent thecontents (mass%) of the respective elements.