稀土球化剂的喷射冶金特性

Injecting Metallurgical Properties of Rare Earth Nodualizers

摘要: 比较了镁和稀土的球化能力及效果。当稀土残留量与镁残留量之比为3:1时,两种球化剂的球化能力相等。原铁水成份为C ≥ 40%,C·E ≥ 57%,稀土处理后,铁水中S ≤ 0.01%,RE ≥ 0.1%时,白口倾向与镁处理结果没有差别。
在100kg铁水包内进行稀土喷射冶金的结果表明,稀土处理脱硫速度快,效率高,脱硫限度接近热力学平衡常数。所得铁水中终硫含量都在0.01%以下,有利于获得良好的球化效果。将硅铁粉与稀土混合喷入可使脱硫、球化和孕育3个过程一次完成,这也是传统方法不具备的特点。

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