Patent ID: 7662246

Claim:
A component or part, wherein the component or part comprises a material for use in high-pressure components comprising an alloy which comprises, in percent by weight: C from about 0.22 to about 0.29 Cr from about 1.1 to about 1.5 Mo from about 0.3 to about 0.6 Ni from about 3.3 to about 3.7 V from 0 to about 0.15 Mn from about 0.15 to about 0.5 (Co + Cu + W) up to about 0.31 S up to about 0.003 P up to about 0.005 (S + P) up to about 0.006 O up to about 0.0038 Si from about 0.1 to about 0.25 Al from about 0.005 to about 0.02 Ca from about 0.0001 to about 0.0008 Mg from about 0.0001 to about 0.0006 (Ti + Nb + Ta + Zr + Hf) up to about 0.01 (As + Bi + Sb + Sn + Zn + B) up to about 0.015 (N + H) up to about 0.01, a balance comprising iron; and wherein the component or part is heat treated to a tensile strength Rm of the material at room temperature of greater than about 1100 N/mm 2 , has a 0.2% yield point Rp 0.2 at room temperature of greater than about 1000 N/mm 2 and a 0.2% yield point Rp 0.2 at 320° C. of greater than about 880 N/mm 2 , and shows mechanical properties measured in longitudinal direction/transverse direction of: Elongation at break A5 >about 16%/>about 14% Elongation at break A4 >about 18%/>about 16% Reduction in area Z >about 55%/>about 45% Notch toughness KV (RT) >about 80 J/>about 60 J Notch toughness KV (−40° C.) >about 50 J/>about 40 J.