Patent ID: 11884997
Assignee: ARCELORMITTAL
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  Y | IPC C

Claim 9:
10. A hot rolled plate or forging of an austenitic steel non-susceptible to relaxation cracking, with composition comprising, in percentages by weight:
0.019%≤C≤0.030%
0.5%≤Mn≤3%
0.1%≤Si≤0.75%
Al≤0.25%
18%≤Cr≤25%
14%≤Ni≤17%
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, and wherein:
Ni(eq.)≥1.11Cr(eq.)−8.24, wherein:
Cr(eq)=Cr+Mo+1.5Si+5V+3Al+0.02
Ni(eq)=Ni+30C+x(N−0.045)+0.87 wherein:
x=22 for 0.23%≤N≤0.25%
x=20 for 0.25%<N≤0.27%.