铸态高强度高韧性QT600-10球墨铸铁控制技术

以铸态QT600-10材质生产技术为例,简要介绍了铸态高强度高韧性球墨铸铁件控制要点:根据铸件壁厚条件,碳(C)控制在3.6%~3.8%、硅(Si)2.5%~2.8%、锰(Mn)<0.3%,采用微合金化时,控制铜(Cu)0.20%~0.50%、锡(Sn)0.02~0.05%。熔炼时采用C高Si低,CE适中,Mn、S、P低,采用低稀土Si-Mg6-8RE1-5球化剂,采用常规75SiFe孕育剂或长效孕育剂,通过控制基体组织比例,达到高强度高韧性铸态QT600-10的要求。

Control Technology of Cast High Strength and Toughness QT600-10 Ductile Iron Casting

The production techniques of as-cast QT600-10 is discussed. The main points of as-cast ductile iron castings with high strength and toughness are briefly recommended. According to the wall thickness of castings,the main chemical constituents are as follows,C 3.6%~3.8%, Si 2.5%~2.8%、Mn<0.3%, the microalloying elements copper and tin are Cu0.20%~0.50% and Sn 0.02%~0.05%. The melt contains high carbon and low silicon, the carbon equivalent is moderate.Spheroidizing treatment with low RE Si-Mg6-8 RE1-5, Inoculation treatment with conventional 75 SiFe inoculant or long-acting inoculant. By controlling the ratio of ferrite to pearlite in matrix structure, high strength and toughness of as-cast QT600-10 can be obtained.