Superaustenitic stainless steel and method of making and use thereof
AssigneeL.E. Jones Company
InventorsCong Yue Qiao, Todd Trudeau
Life of this patent
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Abstract
A superaustenitic stainless steel comprises in weight %, 0.15 to 0.9% C, 0.2 to 1.3% Si, 0 to 0.45% Mn, 32.5 to 37.5% Cr, 13.5 to 17.5% Ni, 3.2 to 5.5% Mo, 0 to 2% Nb, 0 to 0.5% B, 0 to 2% Zr and 30 to 51% Fe. In a preferred embodiment, the superaustenitic stainless steel consists essentially of, in weight %, 0.5 to 0.9% C, 0.2 to 0.5% Si, 0.2 to 0.4% Mn, 33.0 to 35.0% Cr, 15.5 to 17.5% Ni, 4.0 to 4.5% Mo, 0.7 to 0.9% Nb, 0.07 to 0.13% B, 0 to 0.05% Zr and 40 to 46% Fe. The superaustenitic stainless steel is useful for valve seat inserts for internal combustion engines such as diesel or natural gas engines.
Claims22
A superaustenitic stainless steel comprising, in weight %:
- 0.15 to 0.9% C;
- 0.2 to 1.3% Si;
- 0 to 0.45% Mn;
- 32.5 to 37.5% Cr;
- 13.5 to 17.5% Ni;
- 3.2 to 5.5% Mo;
- 0 to 2% Nb;
- 0 to 0.5% B;
- 0 to 2% Zr;
- and
- 30 to 51% Fe.
A valve seat insert comprising in weight %:
- 0.15 to 0.9% C;
- 0.2 to 1.3% Si;
- 0 to 0.45% Mn;
- 32.5 to 37.5% Cr;
- 13.5 to 17.5% Ni;
- 3.2 to 5.5% Mo;
- 0 to 2% Nb;
- 0 to 0.5% B;
- 0 to 2% Zr;
- and
- 30 to 51% Fe.
A method of making a superaustenitic stainless steel, comprising in weight %:
- 0.15 to 0.9% C;
- 0.2 to 1.3% Si;
- 0 to 0.45% Mn;
- 32.5 to 37.5% Cr;
- 13.5 to 17.5% Ni;
- 3.2 to 5.5% Mo;
- 0 to 2% Nb;
- 0 to 0.5% B;
- 0 to 2% Zr;
- and
- 30 to 51% Fe;
- wherein:
- (a) the superaustenitic stainless steel is cast into a shaped component from a melt at a temperature from about 2800° F. to about 3000° F.;
- or
- (b) a powder of the superaustenitic stainless steel is pressed into a shaped component and sintered at a temperature from about 1950° F. to about 2300° F. in a reducing atmosphere, wherein the reducing atmosphere is hydrogen or a mixture of dissociated ammonia and nitrogen.
Dependencies are inferred from the claim text.