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我厂每年用ZG2Cr13、ZG3Cr13及ZG4Cr13不锈钢生产的精铸件品种多、产量大(80t/年)铸件重量一般为0.15～4.6kg。众所周知,含13％铬的不锈钢是一种马氏体不锈钢,该钢种收缩率较大,导热性及塑性差,铸造应力也大,在熔模精密铸造生产中经常产生裂纹。其中ZG4Cr13尤为严重,在潜水泵转子轴套的试生产中,裂纹率达75.82％。 ZG4Cr13轴套的裂纹,在毛坯时不容易发现,精加工后就暴露出来,裂纹沿轴向分布通过低倍分析,裂纹两侧可见到氧化脱碳组织及氧化物。
I plant each year with ZG2Cr13, ZG3Cr13 and ZG4Cr13 stainless steel production of refined castings and more varieties, large output (80t / year) casting weight is generally 0.15 ~ 4.6kg. As we all know, 13% chromium stainless steel is a martensitic stainless steel, the steel shrinkage, thermal conductivity and poor plasticity, casting stress is also large, often in the investment casting production cracks. ZG4Cr13 which is particularly serious, in the trial production of submersible pump rotor bushing, the crack rate of 75.82%. ZG4Cr13 sleeve of the crack, not easy to find in the rough, after finishing exposed, the crack distribution along the axial analysis by low frequency, cracks can be seen on both sides of the oxide decarbonization organizations and oxides.