Abstract: The free cutting 22CrMoHS gear steel (/% ：0.19 〜0.25 C,0.80~1.00 Mn, W0.025 P,0. 040 ~0. 060 S,l. 00 〜1.40 Cr,0. 35 -0.45 Mo) is developed by Suzhou Steel Group. The range of sulfur content in steel is 0.040% ~ 0. 060%. With controlling end point carbon of electric furnace 0.05% ~ 0.12% , beginning refining slag basicity R 4 ~ 5 and (Al₂0₃ ) 25% ~35% ,end of refining slag basicity R 3 ~4 and ( Al₂0₃) 25% ~35% at LF, after VD feeding calcium wire to control the calcium content in steel 0.0015% 〜0.0025% ,secondary cooling water 0. 81 1/Kg,and casting speed 0.75 ~0. 80 m/min, the sulfide in the steel is mainly spherical, and the spheroidization ratio of sulfide inclusions is up to 90% to greatly improve the cutting performance of steel.

摘要： 苏钢开发了一种新的易切削齿轮钢22CrMoHS （/%:0.19～0.25 C,0.80～1.00 Mn,≤0.025 P,0.040～0.060 S,1.00～1.40 Cr,0.35～0.45 Mo）,S控制在0.040%～0.060%;通过控制电弧炉终点[C]在0.05%～0.12%;LF精炼初期渣的碱度（R）和Al2O3含量分别为4～5和25%～35%,在精炼后期渣碱度（R）和Al₂O₃含量分别为3～4和25%～35%;VD后钙处理,使钢中[Ca]在0.0015%～0.0025%;连铸二冷比水量0.81 L/kg,控制拉速0.75～0.80 m/min等工艺,钢中硫化物形态主要为球形,球化率达95%以上,材料的切削性能得到明显改善。

关键词: 易切削齿轮钢22CrMoHS, S含量, 硫化物形态