关键词: 40%铁水-50 t EAF-LF-VD-CC流程, 齿轮钢16MnCr5, 氧含量, , 非金属夹杂物, 淬透性

Abstract: With the process measures including in LF refining process using 0. 004% Ti medium carbon manganese iron and 0. 012% Ti low titanium chromium iron for adjusting alloy content in steel and using amount of 0. 3%Ti silicon-car- bide ≤10 kg/heat, using high basicity refining slag (/% ) : 50 ~55CaO, 5 - 8SiO₂, 27 ~ 31 Al₂O₃, 7MgO, ≤ 0.8( FeO + MnO) and feeding sulfur wire, the chemical composition of 4 heats steel 16MnCr5 is stable i. e. /% : 0.17 ~ 0.19C, 0.12 ~0.16Si, 1.15 ~ 1.16Mn, 0.012 -0.016P, 0.026 〜0.030S, 0.93 ~0.96Cr, 0.007 ~ 0.008Ti, 0.0006 ~ 0.0008B, 0.026 ~0.030Alt, 0. 0013 ~0.0025O) , the rating of inclusions in steel is A thin series ≤2.0, A heavy series ≤1.5, other ≤l.0, the rating band structure in steel is ≤ 2.0 and the hardenability band width △ HRC scale ≤ 6 to meet the requirement of technical specification.

Key words: 40% Hot Metal-50 t EAF-LF-VD-CC Flowsheet, Gear Steel 16MnCr5, Oxygen Content, Non- metallic Inclusions, Hardenability ,