摘要
武钢条材总厂采用铁水脱硫-120 t BOF-LF-200 mm×200 mm方坯连铸-热轧工艺生产窄淬透性带20CrMnTi齿轮钢。生产结果表明,通过转炉高拉碳工艺,控制终点[C]≥0.08%,出钢时加0.8 kg/t铝块预脱氧、钢包吹氩喂氩喂铝线150 m,LF精炼时喂0.4 kg/t铝线和控制精炼渣碱度3.0~4.0,并采用精确调整合金成分,氩封长水口连铸等工艺措施,生产122炉20CrMnTi齿轮钢成分为(%):0.19~0.21C,0.22~0.31Si,0.85~1.04Mn,1.01~1.19Cr,0.04~0.09Ti,0.02~0.06Cu;≤24×10^(-6)[O],≤55×10^(-6)[N];疏松和偏析级别均≤1.0,晶粒度级别≥9.0;淬透性带宽△HRC≤5.9,满足标准要求。
The gear steel 20CrMnTi with narrow hardenability band is produced by hot metal desulphurizing-120 t BOF-LF-200 mm × 200 mm billet casting-hot rolling process at Long Products General Plant, Wuhan Iron and Steel. Pro- duction results show that with the process measures including using BOF catch carbon practice to control end [ C ] ≥ 0. 08%, adding 0. 8 kg/t aluminium during tapping for pre-deoxidizing, than argon blowing and feeding aluminium wire 150 m in ladle, during LF refining feeding 0. 4 kg/t aluminium wire and controlling refining slag basicity 3.0 ~ 4. O, micro- adjusting alloying element content and argon shielding long nozzle casting process, the results of analysis of 122 heats gear steel20CrMnTiare （/%） 0.19 --0.21C, 0.22 ～0.31Si, 0.85 -1.04Mn, 1.01 -1.19Cr, 0. 04 - 0. 09Ti, 0.02 -0. 06Cu, ≤24 × 10-6[ O] and ≤55 × 10-6[ N] ; the rating of porosity and segregation≤1.0 and the rating of grain size ≥9.0; and the width of hardenability band A HRC of products ≤5.9 to meet the requirement of standard. Material Index Gear Steel 20CrMnTi, Melting Analysis, Narrow Hardenability Band, Grain Size
出处
《特殊钢》
北大核心
2014年第2期40-42,共3页
Special Steel
