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 ›› 2013, Vol. 34 ›› Issue (5): 25-27.

• 工艺技术 • 上一篇    下一篇

50 t EAF-LF(VD)-CC流程开发4130钢Φ350 mm连铸圆坯的生产实践

李法兴   

  1. 山东钢铁股份有限公司莱芜分公司特钢事业部,莱芜 271104
  • 收稿日期:2013-03-25 出版日期:2013-10-01 发布日期:2022-09-19
  • 作者简介:李法兴(1978-),男,硕士,工程师,2007年西安建筑科技大学毕业,特殊钢新产品开发和工艺技术研究

Practice of Pilot Production on Φ350 mm Cast Round Bloom of Steel 4130 by 50 t EAF-LF (VD)-CC Flow Sheet

Li Faxing   

  1. Special Steel Division, Laiwi Branch, Shandong Iron and Steel Co Ltd, Laiwu 271104
  • Received:2013-03-25 Published:2013-10-01 Online:2022-09-19

摘要: 采用50 t EAF-LF(VD)-CC-缓冷工艺,通过控制电弧炉终点[C]0.12%~0.25%,终点[P]≤0.015%,出钢预脱氧和合金化,LF精炼时采用CaO-Al2O3系无氟预熔精炼渣,以及连铸综合铸坯控制技术包括钢水深度≥800 mm 19 t中间包,控制拉速0.35~0.45 m/min,钢水过热度15~25℃,优化二冷制度和末端电磁搅拌参数(350 A/8 Hz)等工艺措施,所生产的4130钢(/%:0.29~0.31C、0.25~0.28Si、0.51~0.54Mn、0.96~0.98Cr、0.19~0.20Mo、0.016~0.025A1)Φ350 mm连铸圆坯的[O]、[N]分别为(12~14)×10-6、(55~70)×10-6,低倍组织≤1.0级,锻件的非金属夹杂物A、B≤1.0级、C、D≤0.5级,锻件超声波探伤级别、尺寸公差及表面质量等质量指标均满足用户要求。

关键词: 50tEAF-LF(VD)-CC流程, 4130钢, 圆坯, 生产实践

Abstract: With using 50 t EAF-LF(VD)-CC-slow cooling pross, controlling EAF end [C] 0.12%-0.25% and end [P]≤ 0.015%, pre-deoxidizing and alloying in tapping, using CaO-Al2O3 free fluorine pre-melting refining slag, and integrate casting control technology including 19 t tundish with liquid depth ≥ 800 mm, casting speed 0.35-0.45 m/min, liquid overheating extend 15-25 T , optimum secondary cooling schedule and F-EMS parameter (350 A/8 Hz) etc. for steel 4130 (/% : 0.29-0.31C, 0.25-0.28Si, 0.51-0.54Mn, 0.96-0.98Cr, 0.19-0.20Mo,0.016-0.025A1) Φ350 mm casting round bloom the [O] and [N] are respectively (12-16) x 10-6 and (55-70) X 10-6, the rating of macrostructure ≤ 1.0, and in forged bar the rating of nonmetallic inclusion A and B ≤ 1.0, C and D ≤ 0.5 , the rating of ultrasonic detection, dimension tolerance and surface quality of forgings all meet the requirement of user.

Key words: 50 t EAF-LF (VD) -CC Flow Sheet, Steel 4130, Round Bloom, Production Practice