ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2014, Vol. 35 ›› Issue (2): 40-42.

• 工艺技术 • 上一篇    下一篇

120 t BOF-LF-CC流程生产20CrMnTi齿轮钢的工艺实践

丁礼权1,2,范植金1,罗国华1,方德法2,龙莉1   

  1. 武汉钢铁公司1研究院;2条材总厂,武汉 430083
  • 收稿日期:2013-10-14 出版日期:2014-04-01 发布日期:2022-09-09
  • 作者简介:丁礼权(1981-),男,硕士研究生,工程师,2006年武汉科技大学(本科)毕业,精品棒材开发和质量控制。

Process Practice for Gear Steel 20CrMnTi Produced by 120 t BOF-LF-CC Flow Sheet

Ding Liquan1,2 , Fan Zhijin1 , Luo Guohua1 , Fang Defa2 , Long Li1   

  1. 1 Research and Development Institute, 2 Long Products General Plant, Wuhan Iron and Steel Co Ltd, Wuhan 430083
  • Received:2013-10-14 Published:2014-04-01 Online:2022-09-09

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。

关键词: 20CrMnTi齿轮钢, 冶炼成分, 窄淬透性带, 晶粒度

Abstract: The gear steel 20CrMnTi with narrow hardenability band is produced by hot metal desulphurizing-120 t BOF-LF-200 mm x 200 mm billet casting-hot rolling process at Long Products General Plant, Wuhan Iron and Steel. Production 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 3.0-4.0, microadjusting alloying element content and argon shielding long nozzle casting process, the results of analysis of 122 heats gear steel 20CrMnTi are (/% ) 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 X 10-6[O] and ≤ 55 x 10-6[N]; the rating of porosity and segregation ≤ l.0 and the rating of grain size ≥ 9.0; and the width of hardenability band △HRC of products ≤ 5.9 to meet the requirement of standard.

Key words: Gear Steel 20CrMnTi, Melting Analysis, Narrow Hardenability Band, Grain Size