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): 24-26.

所属专题: 汽车用微合金钢

• 工艺技术 • 上一篇    下一篇

非调质钢F45MnVS热顶锻裂纹分析和改进工艺措施

李泰   

  1. 山东钢铁股份有限公司莱芜分公司,莱芜 271104
  • 收稿日期:2015-04-10 出版日期:2015-10-01 发布日期:2022-08-15
  • 作者简介:李泰(1981-),男,硕士(2008年安徽工业大学),工程师, 2005年山西大学(本科)毕业,特殊钢品种开发与工艺技术 研究。

Analysis on Hot Heading Crack of Non-Quenched and Tempered Steel F45MnVS and Improved Measures of Process

Li Tai   

  1. Laiwu Branch, Shandong Iron and Steel Go Ltd, Laiwu 271104
  • Received:2015-04-10 Published:2015-10-01 Online:2022-08-15

摘要: 非调质钢F45MnVS的生产流程为50 t UHP EAF-LF-VD-260 mm×300 mm,180 mm×220 mm坯连铸-Φ20~Φ160 mm材轧制。根据显微组织分析,热顶锻裂纹由块状和片状MnS和附着的Al2O3-MnO-FeO复合氧化物引起,通过控制钢中Al 0.010%~0.030%,电弧炉终点[C]≥0.20%,终点[P]≤0.025%,[Mn]/[S]>20,LF精炼渣碱度≥3.0,VD后软吹氩时间≥12 min,保证钢中硫分布均匀;中间包钢水过热度20~30℃,控制连铸拉速防止MnS偏析;控制终轧温度850~1000℃,轧后冷速2~4℃/s等工艺措施,使钢中夹杂物主要为长条状MnS,热顶锻试验无裂纹和其他缺陷,全部合格。

关键词: 非调质钢F45MnVS, 热顶锻, 裂纹, 工艺改进

Abstract: The production flowsheet for non-quenched and tempered steel F45MnVS is 50 t UHP EAF-LF-VD-260 mm x300 mm and 180 mm x 220 mm billet casting-rolling to Φ20-Φ160 mm products. According to analysis on microstructure of steel, the hot heading crack is caused by block and lamella MnS and attached with Al2O3 -MnO-FeO compound oxide. With using the process measures including controlling Al content in steel 0.010%-0.030% , EAF end [C]≥0.20% and end [P]≤0.025% ,[Mn]/[S]>20, LF refining slag basicity ≥3.0, after VD soft argon blowing for ≥ 12 min, ensuring homogeneous distribution of sulfur in steel, superheating extent of liquid in tundish 20-30 °C, controlling casting speed to prevent MnS segregation, and controlling finishing rolling temperature 850-1000 °C and cooling rate after rolling 2-4℃/s, the main inclusions in steel is long lath MnS, the hot heading test is all qualified without crack and other defects.

Key words: Non-Quenched and Tempered Steel F45MnVS, Hot Heading, Crack, Improvement of Process