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 ›› 2016, Vol. 37 ›› Issue (2): 39-40.

• 工艺技术 • 上一篇    下一篇

100t DC EAF-LF-VD-CC流程硫易切削钢SAE1144的生产实践

黄周华,阙宗华,董军   

  1. 苏州苏信特钢有限公司技术中心,苏州 215153
  • 收稿日期:2015-10-26 出版日期:2016-04-01 发布日期:2022-08-08
  • 作者简介:黄周华(1976-),男,工程师,1999年武汉科技大学(本科)毕业,炼钢-连铸工艺技术研究。

Production Practice of Sulphur Free-Cutting Steel SAE1144 by 100t DC EAF-LF-VD-CC Flowsheet

Huang Zhouhua , Que Zonghua , Dong Jun   

  1. Technology Center, Suzhou Suxin Special Steel Co Ltd, Suzhou 215153
  • Received:2015-10-26 Published:2016-04-01 Online:2022-08-08

摘要: 中碳硫系易切削钢SAE1144(/%:0.42~0.47C,0.15~0.30Si,1.45~1.65Mn,0.24~0.30S,≤0.025P)采用100t DC EAF-LF-VD-280 mm×320 mm坯连铸工艺流程生产。通过控制出钢钢包温度≥1000℃,出钢时加入200 kg硅铁,钢包底吹氩搅拌;LF采用专用精炼渣系(/%:45~55CaO,15~25Al2O3,15~25SiO2),喂硫线,≥15 min VD处理后控制钢水过热度20~35℃,二冷比水量0.18 L/kg,拉速0.45~0.55 m/min等工艺措施,可稳定控制钢水硫含量和钢水的可浇性,铸坯中心疏松和缩孔级别≤1.5;[O]为14×10-6~15×10-6,[H]1.3×10-6~1.5×10-6,非金属夹杂物满足质量要求。

关键词: 硫易切削钢, SAE1144, 100t DC EAF-LF-VD-CC流程, 工艺实践

Abstract: Medium carbon sulphur free-cutting steel SAE1144 (/%: 0.42-0.47C, 0.15-0.30Si, 1.45-1.65Mn, 0.24-0.30S, ≤0.025P) is produced by 100t DC EAF-LF-VD-280 mm x320 mm bloom casting process. With process measures including controlling tapping ladle temperature m 1 000 , adding 200 kg ferrosilicon during tapping, ladle bottom argon blowing stirring, using LF special refining slag series (/% : 45-55CaO,15-25Al2O3, 15-25SiO2), feeding sulphur wire, controlling liquid overheating extent 20-35 °C after VD treatment for ≥15 min, controlling secondary cooling water rate 0. 18 L/kg and casting rate 0.45-0.55 m/min, the sulphur content in liquid and castability of liquid are stably controlled, and the rating of central porosity and shrinkage cavity is ≤1.5, [O] is 14 x 10-6-15 x 10-6 and [H] is 1.3x10-6 1.5 x 10-6 to meet the requirement for nonmetallic inclusions and quality.

Key words: Sulphur Free-Cutting Steel, SAE1144, 100t DC EAF-LF-VD-CC Flowsheet, Process Practice