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US 5,512,237 AGranted
Precipitation hardenable martensitic stainless steel
AssigneeSandvik AB
InventorAnna H. Stigenberg
Life of this patent
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Abstract
Precipitation hardenable martensitic stainless steel of high strength combined with high ductility. The Iron-based steel comprises of about 10 to 14% chromium, about 7 to 11% nickel, about 0.5 to 6% molybdenum, up to 9% cobalt, about 0.5% to 4% copper, about 0.4 to 1.4% titanium, about 0.05 to 0.6% aluminium, carbon and nitrogen not exceeding 0.05% with iron as the remainder and all other elements of the periodic table not exceeding 0.5%.
Claims20
A precipitation hardenable martensitic stainless steel alloy consisting essentially of, in per cent by weight;
- about 10% to 14% chromium,
- about 7% to 10% nickel,
- about 0.5% to 6% molybdenum,
- up to about 9% cobalt,
- about 0.5% to 4% copper,
- about 0.05% to 0.5% aluminium,
- about 0.4% to 1.4% titanium,
- not exceeding 0.03% carbon and nitrogen,
- the content of tantalum, niobium, vanadium and tungsten being at most 0.1%,
- with iron as the remainder and the total content, consisting essentially of silicon, manganese and any other element of the periodic table, not exceeding 0.3%.
7 more elements
Dependencies are inferred from the claim text.