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为了适应制造较高强度的耐热铸铁件的需要,对提高低铬耐热铸铁的机械性能问题,进行了较系统的试验研究。试验结果表明,合理控制化学成分,恰当进行孕育处理可获得均匀分布的细片状石墨与索氏体基体组织,大大减少莱氏体量,从而显著提高低铬铸铁的机械性能,能使之达到HT25—47或更高的水平,即较现行标准RTCr—0.8与RTCr—1.5高出约2个牌号。低铬孕育铸铁在600℃下的高温强度、抗氧化性、抗生长性能均符合要求。
In order to meet the needs of manufacturing high strength heat-resistant cast iron, to improve the mechanical properties of low-chromium heat-resistant cast iron, a more systematic experimental study. The test results show that the chemical composition can be controlled properly and the uniform distribution of fine flake graphite and sorbite matrix can be obtained by proper inoculation process, which can greatly reduce the amount of ledeburite, thereby significantly improving the mechanical properties of low chromium cast iron HT25-47 or higher level, which is about 2 grades higher than the current standard RTCr-0.8 and RTCr-1.5. Low-chromium inoculated cast iron at 600 ℃ high temperature strength, oxidation resistance, anti-growth performance are in line with requirements.