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US 5,395,583 AGranted
Stainless steel composition
AssigneeMintek
InventorsJohannes H. Potgieter, Peter T. Wedepohl
Life of this patent
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Abstract
High chromium stainless steels having enhanced corrosion resistance are provided in which the steels have 25% to 35% by weight chromium; 0.1 to 5% by weight molybdenum; 0.1 to 6% by weight nickel; 0.0 to 4% by weight copper; 0.0 to 1% by weight titanium and/or niobium and/or vanadium; and, 0.02 to 5% by weight of a platinum group metal. The steels are particularly resistant to sulphuric and phosphoric acids.
Claims9
A high chromium stainless steel comprising:
- ______________________________________ chromium 28% to 30% by weight;
- molybdenum 3.5% to 4.2% by weight;
- nickel 2.0% to 2.5% by weight;
- copper 0.0 to 4% by weight;
- platinum group metal 0.02 to 5% by weight;
- titanium and/or niobium 0.0 to 1% by weight;
- and,;
- and/or vanadium the balance - other than minor iron constituents and impurities. ______________________________________
5 more elements
Dependencies are inferred from the claim text.