Abstract: Based on research of main composition alloying principle for hot working die steel,the studied new precision casting hot working die steel was melted by a 250 kg medium frequency induction furnace and the wearing test on test steels at 400 ℃ was carried by MG2000 high temperature friction-wear testing machine. The research results showed that according  to      the principle of V/C-3.0,C_res-0. 1%～0.2%,Cr/(Cr+Mo)-0.68~0.85,Cr/C_res->16.6,Mo/C_res->16,a  designed new precision  casting hot working  die  steel-0.32C,3.54Cr,2.41Mo,1.02V had higher high-temperature wear resistance,of which the high-temperature wear rate at 400 ℃ was 30% that of 0.45C- 5.3Cr-  1.4Mo-0.83V hot working die steel H13 and was 20%～25% that of 0.37C-2.48Cr-7.82W-0.41V die steel 3Cr2W8V.

Key words: Cr-Mo-V New Hot Working Die Steel, Precision Casting,Wear Resistance at High Temperature

摘要： 在研究热作模具钢主要成分合金化原理的基础上,用250 kg中频感应炉熔炼研究新型精铸热作模具钢,并采用MG2000高温摩擦磨损试验机对试验钢进行400℃磨损试验。研究结果表明,根据V/C 3.0,C_余0.1%~0.2%,Cr/(Cr+Mo)0.68~0.85,Cr/C_余>16.6,Mo/C_余>16原则,设计的新型精铸热作模具钢(%:0.32C,3.54Cr,2.41Mo,1.02V)具有高的高温耐磨性,其400℃高温磨损率为H13钢(%:0.45C,5.3Cr,1.4Mo,0.83V)的30%,3Cr2W8V钢(%:0.37C,2.48Cr,7.82W,0.41V)的20%~25%。

关键词: Cr-Mo-V新型热作模具钢, 精铸, 高温耐磨性