本文研究1~#稀土硅铁合金对ZG25铸钢的组织和性能的影响。经研究表明,在ZG25铸钢中加入0.2%～0.8%1~#稀土硅铁合金,可使铸态的一次晶细化;魏氏组织大部消除;铁素体沿晶界网状分布得以改善,非金属夹杂的形态及分布有较大改善;使σb提高7～10%,δ提高10%左右,ψ提高40%左右,ak提高26%以上:钢的铸造性能如流动性和抗热裂倾向都有很大提高。 In this paper, 1 ~ # rare earth ferrosilicon alloy ZG25 cast steel microstructure and properties. The study shows that adding 0.2% ~ 0.8% 1 ~ # rare-earth ferrosilicon alloy to ZG25 cast steel can refine the as-cast primary crystal, eliminate most of the Westem’s structure, and improve the distribution of ferrite along the grain boundary , Non-metallic inclusions have greatly improved the morphology and distribution; so that σb increased by 7 to 10%, δ increased by about 10%, ψ increased by 40%, ak increased by 26% or more: steel casting properties such as fluidity and thermal cracking Tendency has greatly improved.