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

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

更新时间：2026-01-21

- Practice of Pilot Production on Φ350 mm Cast Round Bloom of Steel 4130 by 50 t EAF-LF (VD)-CC Flow Sheet
- Special Steel Vol. 34, Issue 5, Pages: 25-27(2013)
- 作者机构：
  
  山东钢铁股份有限公司莱芜分公司特钢事业部,莱芜,271104
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：25 March 2013，
  
  Online First：19 September 2022，
  
  Published：19 September 2013
- 稿件说明：
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李法兴. Practice of Pilot Production on Φ350 mm Cast Round Bloom of Steel 4130 by 50 t EAF-LF (VD)-CC Flow Sheet[J]. Special Steel, 2013, 34(5): 25-27.
DOI：

李法兴. Practice of Pilot Production on Φ350 mm Cast Round Bloom of Steel 4130 by 50 t EAF-LF (VD)-CC Flow Sheet[J]. Special Steel, 2013, 34(5): 25-27. DOI：

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-Al

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。

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-Al

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

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.

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