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首次获得了具有粒状碳化物的莱氏体型铸造模具钢，解决了Ｃｒ１２类钢精密成型模具强韧性低的问题。试验结果表明：该新型铸造模具钢基体组织是以位错马氏体为主，含少量李晶马氏体和残留奥氏体；其碳化物形态不同于传统莱氏体型铸造模具钢的网状碳化物，在不同截面尺寸下均呈粒状均匀分布；在硬度为ＨＲＣ６０～６２时，其冲击韧性明显高于传统莱氏体型铸造模具钢，已达到锻造Ｃｒ１２类钢的下限值；其断裂韧性和疲劳裂纹扩展抗力明显高于传统莱氏体型铸钢和锻造Ｃｒ１２类钢；具有高的耐磨性。并进行了现场应用试验。
For the first time, the ledeburite casting die steel with granular carbides has been solved, which solves the problem of low toughness of the precision forming die of Cr12 steel. The experimental results show that the matrix structure of the new foundry die steel is mainly dislocation martensite with a small amount of martensite and retained austenite. The carbide morphology is different from that of the traditional ledeburite die steel The carbides are uniformly distributed in the shape of particles under different cross-sectional dimensions. The impact toughness of HRC 60 ~ 62 is obviously higher than that of the traditional ledeburite cast die steels, which has reached the lower limit of forged Cr12 steel. The fracture toughness And fatigue crack growth resistance was significantly higher than the traditional ledeburite cast steel and forged Cr12 steel; with high wear resistance. And conducted field application test.