The macro surface wear and micro structure of a 38CrMoAlA failure screw in injection molding machine were analyzed,the existing defects in the heat-treatment were pointed out,and finally a reasonable isothermal nitriding procedure was provided.

对保温补贴材料——漂珠的物理性能、保温性能、高温强度等方面进行研究,并且浇铸了几个试件进行分析,试验结果表明:漂珠保温补贴具有一定的保温性能和高温强度,可应用于铸钢件生产,具有一定的经济效益.