| 摘要 |
An austenitic steel not susceptible to relaxation cracking, with composition comprising, in percentages by weight: 0.019% ≦̸C ≦̸0.030%, 0.5% ≦̸Mn ≦̸2%, 0.1% ≦̸Si ≦̸0.75%, Al >0.25%, 18% ≦̸Cr ≦̸25%, 12% ≦̸Ni ≦̸20%, 1.5% ≦̸Mo ≦̸3%, 0.001 % <B ≦̸0.008%, 0.25% ≦̸V ≦̸0.35%, 0.23% ≦̸N ≦̸0.27%, the balance being iron and unavoidable impurities wherein: Ni(eq.) ≧1.11 Cr(eq.) −8.24, wherein: Cr(eq)=Cr+Mo+1.5 Si+5V+3AI+0.02, Ni(eq)=Ni+30C+x(N−0.045)+0.87 wherein: x=30 for N≦̸0.2, x=22 for 0.2<N≦̸0.25, x=20 for 0.25<N≦̸0.35. |
