在稀土合金对坯材质量影响的研究中,从钢水包连续浇注各种碳素合金钢(15、45、y8及9Xφ)时,向钢水内加入稀土合金。所用的铈铁合金、硅混合稀土金属的合金及硅镧合金的量为0.02—0.10%,并且稀土回收率达70国—90%。稀土合金的作用为:可减小偏析及轴向气孔率、使定向结晶带变狭窄、使等轴品带变宽、并且使树枝状晶体的厚度从1.5减小到0.5毫 In the study of the influence of rare earth alloy on the quality of billet, rare earth alloy was added into the molten steel from the continuous casting of various carbon alloy steel (15, 45, y8 and 9Xφ). The amount of the cerium iron alloy, the silicon mixed rare earth metal alloy and the silicon lanthanum alloy is 0.02-0.10%, and the recovery rate of rare earth is 70-70%. The role of rare earth alloy: can reduce the segregation and axial porosity, the narrowing of the directional crystallization zone, the equiaxed zone widens, and the dendrite thickness from 1.5 to 0.5 milliseconds