Patent ID: 8900380

Claim:
A low-chromium stainless steel characterized in that it comprises, in mass %, C: 0.015 to 0.025%, N: 0.008 to 0.014%, C+N: 0.023 to 0.039%, Si: 0.2 to 1.0%, Mn: 1.0 to 1.5%, P: 0.04% or less, S: 0.03% or less, Cr: 10 to 13%, Ni: 0.2 to 1.5%, and Al: 0.005 to 0.1% or less; and further comprises Ti: 6×(C %+N %) or greater and 0.25% or less, the balance being Fe and unavoidable impurities; and that the contents of the elements satisfy Expression (A) and Expression (B): γ p (%)=420×C %+470×N %+23×Ni %+9×Cu %+7×Mn %−11.5×Cr %−11.5×Si %−12×Mo %−23×V %−47×Nb %−49×Ti %−52×Al %+189≧80% (A) Ti %×N %<0.003 (B).