How to improve the tensile strength of gray iron investment castings?

*To improve the tensile strength of gray iron investment castings,the carbon content shoule be low.Mostly the carbon content of gray iron investment castings is 2.6%~3.6%.And the content of silicon is 1.2%~33.0%.

*According to the situation of casting wall thickness,we should as far as possible to take the lower limit and improve the content of manganese properly.Normally the manganese content of gray iron castings is 0.4%~1.2%.

*Also can adopt alloying method to improve the tensile strength of casting and properly add alloy elements such as chromium,molybdenum,tin,etc.