Process Practice for End B Control of Steel 25MnB Steelmaking by 50 t EBT EAF-LF(VD)-CC Flow Sheet

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Process Practice for End B Control of Steel 25MnB Steelmaking by 50 t EBT EAF-LF(VD)-CC Flow Sheet

更新时间：2026-01-21

- Process Practice for End B Control of Steel 25MnB Steelmaking by 50 t EBT EAF-LF(VD)-CC Flow Sheet
- Special Steel Vol. 35, Issue 2, Pages: 37-39(2014)
- 作者机构：
  
  南通宝钢钢铁有限公司,南通,226002
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：11 October 2013，
  
  Online First：09 September 2022，
  
  Published：09 September 2014
- 稿件说明：
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杨钢铁. Process Practice for End B Control of Steel 25MnB Steelmaking by 50 t EBT EAF-LF(VD)-CC Flow Sheet[J]. Special Steel, 2014, 35(2): 37-39.
DOI：

杨钢铁. Process Practice for End B Control of Steel 25MnB Steelmaking by 50 t EBT EAF-LF(VD)-CC Flow Sheet[J]. Special Steel, 2014, 35(2): 37-39. DOI：

摘要

通过电弧炉配加25~36 t/炉铁水

出钢加100 kg铝铁预脱氧

LF精炼过程精炼渣碱度≥4

喂Al线(目标0.015%Al)后加钛铁(目标0.04%Ti)

VD后加硼铁

软吹氩5~10 min

连铸全程保护浇铸等工艺措施

25炉25MnB钢(/%:0.23~0.28C，0.15~0.35Si，1.00~1.30Mn，0.0005~0.0030B，≤0.065Ti)Φ180 mm圆坯的O含量为8×10

-6

~13×10

-6

N含量为30×10

-6

~49×10

-6

B含量0.0015%~0.0024%

B的回收率可达90%

有效地改善了B的控制精度和25MnB钢成品B的命中率。

Abstract

With the process measures including EAF charging hot metal 25-36 t/heat

during tapping adding 100 kg ferroaluminium to pre-deoxidizing

controlling refining slag basicity ≥ 4 during LF refining

after feeding Al wire ( aim 0.015% Al) adding ferrotitanium (aim 0.04%Ti)

after VD adding ferroboron and soft argon blowing for 5-10 min

and whole process shielding casting

the 25 heats production results show that in Φ180 mm round billet of steel 25MnB (/% : 0.23 ~0.28C

0.15-0.35Si

1.00-1.30Mr

0.0005-0.0030B，≤0.065Ti) the oxygen content is 8 x 10

-6

-13 x 10

-6

the nitrogen content is 30 x 10

-6

-49 x 10

-6

and the boron content is 0.0015% -0.0024%

and the yield of boron is up to 90%

it is available to improve the control extent of boron content and the hitting accur

acy of B in finishing steel 25MnB.

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