Patent ID: 8999080
Filing Date: 2015-04-07
Classification: C22C,C22F,F02F

Abstract:
1. A cylinder head for an internal combustion engine, wherein the cylinder head comprises an aluminum alloy casting, wherein the aluminum alloy comprises: in terms of mass ratios, 4.0 to 6.0% of Si, 0.5 to 1.3% of Cu, 0.25 to 0.5% of Mg, no more than 0.5% of Fe, no more than 0.07% of Mn, 0.002 to 0.02% of Sr; and Al and inevitable impurities, which are residues, wherein the cylinder head has a high cycle fatigue strength of 100 MPa or more, an elongation of 10.0% or more, and a hardness of 50 HRB or more in a vicinity of a surface of a combustion chamber; and wherein the Mn is present as an intentional addition.