High toughness, ultra-high strength steel having an excellent st

Details High toughness, ultra-high strength steel having an excellent st High toughness, ultra-high strength steel having an excellent st

1987-04-22

1989-03-21

Yee, Deborah

Alloys or metallic compositions

Ferrous

Chromium containing, but less than 9 percent

420 96, 420 97, C22C 3846

Patent

active

048141410

ABSTRACT:
A high toughness, ultra high-strength steel having an excellent stress corrosion cracking resistance with a yield stress of not less than 110 kgf/mm.sup.2, which comprises 0.06-0.20 wt % of C, not more than 0.35 wt % of Si, 0.05-1.0 wt % of Mn, 8-11 wt % of Ni, 0.2-2.5 wt % of Cr, 0.7-2.5 wt % of Mo, 0.05-0.2 wt % of V, 0.01-0.08 wt % of Al, not more than 0.005 wt % of N, not more than 0.003 wt % of O, provided that the value of Al (%).times.N (%).times.10.sup.4 is not more than 1.5, and the balance being substantially Fe and inevitable impurities.

REFERENCES:
patent: 3620717 (1971-11-01), Sekino et al.
patent: 4152148 (1979-05-01), Machmeier

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