关键词: 真空脱气, 易切削不锈钢 1.4104, Bi-Ce, 硫化物球化, 切削性能

Abstract: Quality stainless steel 1. 4104 ( /% ：0. 16C,1. 23Mn,16. 40Cr,0. 41Ni,0. 43Mo,0. 023Ca ) for electro-hydraulic controller has been first melted at Daye Special Steel Co Ltd by 20 t electronic arc furnace and refined in ladle furnace and vacuum degassing unit, cast 1. 2 t ingot and forged into products. The transverse mechanical properties and machinability have been enhanced significantly by feeding bismuth cored wire（Bi：0. 036% ) and adding rare earth nodulizer (Ce： 0.054% ). Comparing with that of the free Bi-Ce steel, the total number of inclusion of the containing Bi-Ce steel decreases by 84. 4% and the number of MnS inclusion decreases by 85. 5% , average size of inclusion increases from 4. 5 μm to 13. 7 μm and cut force lower by 70～80 N with thicker and more easily broken chips, the transverse reduction of area increases from 3% to 17% .