| 摘要 |
<p>HIGH TEMPERATURE CAST AUSTENITIC EXHAUST VALVE 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 to 0.95, manganese 2.5 to 4.0, chromium 16.0 to 19.0, nickel 10.0 to 12.0, molybdenum 6.0 to 9.0, 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.</p> |
