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第一汽车制造厂热处理厂采用的精铸耐热钢夹具材料,现已全部由3Cr25Ni25Si2改为3Gr25Ni10SiNRE,其组成百分比如下表: 该材料属于铬镍氮系耐热钢。它是在3Cr24Ni7SiN耐热钢牌号的基础上发展起来的。适当提高铬、镍含量可有效地减少耐热钢铁素体的产生。加入N代替N_i,可大幅度降低耐热钢成本和提高抗热性。另外,加入稀土后,有效地提高了耐热钢的铸造性能,降低了铸造缺陷的产生,使铸件废品率由原60％降到接近零,同时提高了耐热钢夹具的使用寿命。
First Automobile Works heat treatment plant used cast heat-resistant steel fixture materials, has now been replaced by 3Cr25Ni25Si2 3Gr25Ni10SiNRE, the composition of the following table: The material is chrome-nickel nitrogen heat-resistant steel. It is in 3Cr24Ni7SiN heat-resistant steel grades developed on the basis of. Appropriate increase of chromium, nickel content can effectively reduce the heat-resistant ferrite production. Adding N instead of N_i can greatly reduce the cost of heat-resistant steel and improve the heat resistance. In addition, the addition of rare earth, effectively improve the casting performance of heat-resistant steel, reducing the casting defects, the casting scrap rate dropped from nearly 60% to nearly zero, while increasing the service life of heat-resistant steel fixture.