Patent ID: 6139660
Filing Date: 2000-10-31
Classification: C22C,C22F,F01L

Abstract:
A method for producing a diesel engine valve comprising the steps of:forging a raw material of the high corrosion resisting alloy into a valve shape of the diesel engine, wherein said high corrosion resisting alloy consists by weight percentage of not more than 0.1% of C, not more than 1.0% of Si, not more than 1.0% of Mn, more than 25% and not more than 32% of Cr, more than 2.0% and not more than 3.0% of Ti, 1.0 to 2.0% of Al, and the balance being Ni plus incidental impurities;subjecting the obtained valve shaped forging to aging treatment; andpartially enhancing hardness of the valve by subjecting at least part of the aging treated forging to cold working.