High temperature cast austenitic exhaust valve

Details High temperature cast austenitic exhaust valve High temperature cast austenitic exhaust valve

1974-12-23

1976-08-24

Lovell, C.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75125, 75128C, 75128W, 75128B, C22C 3822, C22C 3838

Patent

active

039764761

ABSTRACT:
A new high temperature as-cast austenitic stainless steel is disclosed which is particularly suited for exhaust valve applications in automotive engines. The austenitic steel has improved creep strength, fatigue resistance, ductility, hardness and tensile strength at a temperature level of at least 1700.degree.F. The new steel has a composition, by weight percentage, within the following limits: carbon 0.35-0.95, manganese 2.5-4.0, chromium 16.0-19.0, nickel 10.0-12.0, molybdenum 7.0-8.0, silicon 2.5 max., copper 1.0 max., cobalt 3.0 max., other elements each no greater than 0.2 max. and all other elements as a total no greater than 3.5 max., the remainder being iron.

REFERENCES:
patent: 2225730 (1940-12-01), Armstrong
patent: 3152934 (1964-10-01), Lula et al.
patent: 3853545 (1974-12-01), Kusaka et al.
patent: 3859083 (1975-01-01), Kusaka et al.

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