Injecting Metallurgical Properties of Rare Earth Nodualizers
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摘要: 比較了鎂和稀土的球化能力及效果。當稀土殘留量與鎂殘留量之比為3:1時,兩種球化劑的球化能力相等。原鐵水成份為C ≥ 40%,C·E ≥ 57%,稀土處理后,鐵水中S ≤ 0.01%,RE ≥ 0.1%時,白口傾向與鎂處理結果沒有差別。
在100kg鐵水包內進行稀土噴射冶金的結果表明,稀土處理脫硫速度快,效率高,脫硫限度接近熱力學平衡常數。所得鐵水中終硫含量都在0.01%以下,有利于獲得良好的球化效果。將硅鐵粉與稀土混合噴入可使脫硫、球化和孕育3個過程一次完成,這也是傳統方法不具備的特點。Abstract: The nodualization effect of cast iron treated by rare earth alloys was compared with ones treated by magnesium alloys. As the ratio of residual rare earth content to residual Mg in cast iron is 3:1, the same nodu-alization effect will be obtained. A proper composition for rare earth sphe-ro idual graphite cast iron is as C ≤ 4.0%, E.C ≥ 5.0%, S<0.01%, RE ≥ 0.1%. and there is no defference in chilling tendency between RE-SG and Mg-SG.By means of injecting rare earth powder, the speed of reaction of desulphurization is higher, and the limit of dcsulphurization is close to the thermodynamic equilibrium. If the amount of RE to be added into liquid iron is properly controlled, desulphurization,nodualization and inoculation can be finished at a time-
Key words:
- rare earth /
- spheroidual graphite cast iron /
- injecting powder metallurgy
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