关键词: 易切削齿轮钢22CrMoHS, S含量, 硫化物形态

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.