Stainless steel

Details Stainless steel Stainless steel

1997-05-30

1999-03-30

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

420 63, 148326, 148327, 148325, C22C 3844

Patent

active

058884491

ABSTRACT:
Precipitation hardening (PH) stainless steels heat treatable to yield strength levels in the range of 200 ksi with exceptionally high fracture toughness are achieved in alloys consisting essentially of 12.25-13.25% chromium, 7.5-8.5% nickel, 2.0-2.5% molybdenum, 0.8-1.35% aluminum, not over 0.05% carbon, not over 0.10% silicon, not over 0.10% manganese, not over 0.010% phosphorus and with especially critical amounts of not over 0.0020% (20 ppm) nitrogen, not over 0.0020% (20 ppm) sulfur, not over 0.0026% (26 ppm) nitrogen plus sulfur; not over 0.04% titanium, and remainder essentially Fe.

REFERENCES:
patent: 3556776 (1971-01-01), Clark, Jr. et al.
patent: 4814141 (1989-03-01), Imai et al.

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