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 ›› 2015, Vol. 36 ›› Issue (5): 39-42.

所属专题: 齿轮钢

• 工艺技术 • 上一篇    下一篇

影响20CrMnTiH(TS)齿轮钢夹杂物控制因素的分析和工艺优化

高菊1,丁志军2,李辉2   

  1. 1. 华北理工大学迁安学院,迁安 064400;
    2. 河北钢铁石钢公司,石家庄 050031;
  • 收稿日期:2015-05-18 出版日期:2015-10-01 发布日期:2022-08-16
  • 作者简介:高菊(1980-),女,硕士(2009年河北理工大学),讲师,2003年河北理工大学(本科)毕业,凝固理论与钢质量控制研究

Analysis on Influence Factors of Control of Inclusions in Gear Steel 20CrMnTiH (TS) and Process Optimization

Gao Ju1 , Ding Zhijun2 , Li Hui2   

  1. 1. School of Qian'an, North China University of Science and Technology, Qian'an 064400 ;
    2. Shijiazhuang Steel Co, Hebei Iron and Steel Co, Shijiazhuang 050031
  • Received:2015-05-18 Published:2015-10-01 Online:2022-08-16

摘要: 20CrMnTiH(TS)钢冶金流程为60 t 顶底复吹转炉-LF-VD-150 mm×150 mm方坯连铸。钢厂20CrMnTiH(TS)钢夹杂物一次检验不合格率达2.0%,主要为B类(复合钙铝酸盐+镁铝尖晶石,以及部分三氧化二铝)和D类夹杂(钙铝酸盐,部分为复合钙铝酸盐+镁铝尖晶石+氮化钛),尺寸>20μm。通过采用低磷铁水和优质废钢,转炉终点[C]≥0.09%,转炉出钢加40 kg硅钙和40 kg钢芯铝替代原只加80 kg钢芯铝预脱氧,LF精炼采用SiC70替代SiC45进行扩散脱氧,VD后喂Ti线,保证精炼终渣碱度为3.0,控制连铸时钢包余钢量>2 t 等工艺措施使T[O]从12×10-6降至8×10-6,一次夹杂物检验不合格率下降至0.5%。

关键词: 20CrMnTiH(TS)齿轮钢, T[O], B类和D类夹杂物, 工艺优化

Abstract: The metallurgical flow sheet for steel 20CrMnTiH (TS) is 60 t top and bottom combined blowing converter- LF- VD- 150 mm X 150 mm billet casting. The unqualified rate of inclusions in steel 20CrMnTi H(TS) at first examination at steelworks is up to 2% main inclusions are B series ( compound calcium aluminate + magnesia-alumina spinel, and partial alumina) and D series ( calcium aluminate, and partial compound calcium aluminate + magnesia-alumina + titanium nitride) ,that size is more than 20 μm. With the process measures including using low phosphorus hot metal and high quality scrap, converter end [C] ≥0, 09% , adding 40 kg silicon-calcium and 40 kg aluminium cladding steel to replace original only adding 80 kg aluminium cladding steel for pre-deoxidation in converter tapping , using SiC70 to replace SiC45 to diffusion-deoxidize in LF refining, feeding Ti wire after VD, insuring refining end slag basicity 3. 0, and controlling heel liquid more than 2 t, the T[O] decreases from original 12 X 10-6 to 8 x 10-6 and the unqualified rate of inclusions in steel at first examination decreases to 0.5%,

Key words: Gear Steel 20CrMnTiH (TS), T [O], B Series and D series Inclusions, Process Optimization