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 (1): 34-36.

• 工艺技术 • 上一篇    下一篇

100 t EAF-LF-VD-CC流程生产SK5弹簧钢的工艺实践

吴辉强1, 顾超2, 林路2, 包燕平2   

  1. 1杭州钢铁集团公司技术质量处,杭州310022;
    2北京科技大学钢铁冶金新技术国家重点实验室,北京100083
  • 收稿日期:2015-08-13 出版日期:2016-02-01 发布日期:2022-08-24
  • 作者简介:吴辉强(1982-),男,工程师,2006年东北大学(本科)毕业,洁净钢冶炼工艺研究。

Practice of Process for Spring Steel SK5 Produced by 100 t EAF-LF-VD-CC Flowsheet

Wu Huiqiang1, Gu Chao2, Lin Lu2 ,  Bao Yanping2   

  1. 1 Department of Technology and Quality, Hangzhou Iron and Steel Group Co, Hangzhou 310022 ;
    2 State Key Laboratory of Advanced Metallurgy, University of Science and Technology, Beijing 100083 
  • Received:2015-08-13 Published:2016-02-01 Online:2022-08-24

摘要: SK5 弹簧钢(/% :0. 75 ~0. 84C, ≤0. 35Si, ≤0. 40Mn, ≤0. 035P,≤0.030S)经 100 t EAF-LF-VD-CC 流程生产。通过EAF出钢加硅镒合金和铝铁进行预脱氧,LF精炼过程添加80~150 kg铝镁钙和少量硅锭合金进行复合铝脱氧,精炼渣碱度11.13,(CaO)/(Al2O3) =4. 98等工艺措施,脱氧效果较明显,铸坯中平均全氧含量达到 11 x 10-6项,铸坯中氮含量达到35 x 10-6。冶炼过程夹杂物种类按纯Al2O3>硫化物一'MgO - A12O3 - CaO—MgO •Al2O3 • CaO • SiO2变化,铸坯中夹杂物主要为CaO-A12O3 • SiO2 - MgO系,其塑性化程度可通过调整精炼渣成分、降低精炼渣熔点实现进一步优化。

关键词: SK5弹簧钢, 100 t EAF-LF-VD-CC流程, , 洁净度

Abstract: The spring steel SK5 (/% : 0.75 ~0. 84C,≤ 0. 35Si, ≤0.40Mn, ≤0. 035P, ≤0.030S) is produced by 100 t EAF-LF-VD-CC flow sheet. With using the process measures including pre-deoxidizing at EAF tapping by adding silicon-manganese and ferroaluminium, compound-deoxi dizing during LF refining process by adding 80 ~ 150 kg aluminium- manganese-calcium alloy and small amount silicon manganese alloy with refining slag basicity 11.13 and ( CaO) / ( Al2 03) =4. 98, the deoxidizing effect is obvious, the average total oxygen content is 11 X 10-6 in casting billet and the nitrogen content in billet is 35 x 10 -6. During steelmaking process the change sequence of inclusions in steel is pure A12O3- sulfide- MgO  •A12O3 • CaO- MgO • A12O3 • CaO • SiO2, and the main inclusions in billet is CaO • Al2 O3・ SiO2 ・ MgO series, its plasticization level could be optimized future by adjusting refining ingredient and reducing melting point of refining slag.

Key words: Spring Steel SK5, 100 t EAF-LF-VD-CG Flowsheet, , Cleanliness