Austenitic stainless steel with good oxidation resistance
AssigneeSandvik AB
InventorJohan Linden
Life of this patent
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Abstract
A new austenitic stainless steel alloy is provided (in wt. %) according to the following analysis: C: less than 0.12%; Si: less than 1.0%; Cr: 16-22%; Mn: less than 2.0%; Ni: 8-14%; Mo: less than 1.0%; S: less than 0.03%; O: less than 0.03%; N: less than 0.05%; La: between 0.02% and 0.11%; and one of the following: (i) Ti in an amount at least 4 times the amount of carbon and 0.80% or less, or (ii) Nb in an amount at least 8 times the amount of carbon and 1.0% or less; the remainder Fe and normally occurring impurities. The new steel is particularly suitable as a super heater steel and a heat exchanger steel.
Claims10
An austenitic stainless steel comprising in weight percent:
- C:
- less than 0.12%;
- Si:
- less 1.0%;
- Cr:
- 16-22%;
- Mn:
- less than 2.0%;
- Ni:
- 8-14%;
- Mo:
- less than 1.0%;
- S:
- less than 0.03%;
- O:
- less than 0.03%;
- N:
- less than 0.05%;
- La:
- between 0.02% and 0.11%;
- and
- one of the following:
- (i) Ti in an amount at least 4 times the amount of carbon and 0.80% or less, or
- (ii) Nb in an amount at least 8 times the amount of carbon and 1.0% or less;
- the remainder Fe and normally occurring impurities.
Dependencies are inferred from the claim text.