Title: High temperature cast austenitic exhaust valve

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.

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Inventors: Mrdjenovich, Robert (Trenton, MI, US)

Application Number: 535925
Filing Date: 1974-12-23
Publication_date: 1976-08-24
Assignee:
Primary Class(es): 420/38 420/46
Other Classes:
US Patent Ref:

2225730	Dec, 1940	Armstrong	75/128.
3152934	Oct, 1964	Lula et al.	75/128.
3853545	Dec, 1974	Kusaka et al.	75/128.
3859083	Jan, 1975	Kusaka et al.	75/128.

Other Refs:
Primary Examiner: Lovell, C.
Assistant Examiner: Steiner, Arthur J.
Attorney: