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本文介绍了稀土高铝耐热球墨铸铁的生产实践、化学成分、稀土用量及其控制、稀土和铝加入方式以及冷却速度对金相组织的影响。铸造工艺、铸件缺陷及分析、耐热性能及使用效果。试验和使用证明:稀土高铝耐热球墨铸铁在105O~1100℃长时间工作不起氧化皮,热强度800℃时,14~19kg/mm2,900℃时≥13.3kg/mm2,室温强度近于HT30-54,αk≈2~6kgM/cm2,锤击铸件或浇冒口,很难碎裂,并能机械加工。可以认为是以我国富产资源为原料,能用各种炉子熔炼、耐热和综合机械性能(特别是韧性)均较高硅、中硅中铝球铁、高铝片墨铸铁为高的一种耐热铸铁,也是镍铬系耐热材料较好的替代品。
This paper introduces the production practice, chemical composition, rare earth content and its control, rare earth and aluminum addition mode and cooling rate on the microstructure of rare earth high aluminum heat-resistant ductile iron. Casting process, casting defects and analysis, heat resistance and the use of results. Tests and Proofs of Use: Rare-earth high-alumina heat-resistant ductile iron can not work at 105O ~ 1100 ℃ for a long time and can not afford oxide scale. When the hot strength is 800 ℃, 14 ~ 19kg / mm2, ≥13.3kg / HT30-54, αk ≈2 ~ 6kgM / cm2, hammer casting or riser, it is difficult to crack, and can be machined. Can be considered to be rich resources in China as raw material, can use a variety of furnace melting, heat and comprehensive mechanical properties (especially toughness) are high silicon, aluminum in the aluminum ductile iron, high-alumina ductile iron as a high The kind of heat-resistant cast iron, but also a better substitute for nickel-chromium heat-resistant materials.