Practice for Control of Longitudinal Surface Crack of Q235B and Q345B Steel Casting Slab Produced by CSP Process

成泽伟; 王永胜; 阮强; 成东全

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Practice for Control of Longitudinal Surface Crack of Q235B and Q345B Steel Casting Slab Produced by CSP Process

更新时间：2026-01-21

- Practice for Control of Longitudinal Surface Crack of Q235B and Q345B Steel Casting Slab Produced by CSP Process
- Special Steel Vol. 31, Issue 3, Pages: 24-26(2010)
- 作者机构：
  
  1. 北京科技大学冶金与生态工程学院,北京,100083
  2. 酒泉钢铁集团公司碳钢薄板厂,嘉峪关,735100
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：08 December 2009，
  
  Online First：07 November 2022，
  
  Published：07 November 2010
- 稿件说明：
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成泽伟, 王永胜, 阮强, et al. Practice for Control of Longitudinal Surface Crack of Q235B and Q345B Steel Casting Slab Produced by CSP Process[J]. Special Steel, 2010, 31(3): 24-26.
DOI：

成泽伟, 王永胜, 阮强, et al. Practice for Control of Longitudinal Surface Crack of Q235B and Q345B Steel Casting Slab Produced by CSP Process[J]. Special Steel, 2010, 31(3): 24-26. DOI：

摘要

酒钢Q235B(0.18%C)和Q345B(0.17%C)钢CSP工艺生产的68 mm×1 600 mm铸坯的纵裂纹主要出现在炉次间的第一块铸坯

裂纹宽0.01～0.30 mm、深0.10 mm、长度≥50 mm。纵裂纹影响因素的分析结果表明

当[S]≥0.008%、钢水过热度≥40°、结晶器锥度≤4 mm时

保护渣碱度和粘度较低

以及结晶器钢板厚度≤12mm时

铸坯裂纹指数明显增加。通过控制[S]≤0.008%

钢液过热度30±5℃

结晶器液面波动±3 mm

Q235B钢裂纹发生率由2%降至0.36%

Q345B钢由5%降至0.98%。

Abstract

The longitudinal surface crack of 68 mm x 1 600 mm casting slab of Q235B steel (0. 18% C) and Q345B sleel (0. 17%C) produced by CSP process at Jiuquan Steel mainly occurred at first slab between heats with width of crack 0. 01 -0. 30 mm

depth 0. 10 mm and length ≥50 mm. The results by analyzing the influence factors on longitudinal crack show that as [ S] ≥ 008%

overheating temperature of liquid steel 340°

mold taper ≤4 mm

lower basicity and viscosity of mold powder and thickness of mold copper plat ≤12 mm

the crack index of slab obviously increases. With controlling [S] ≤0. 008%

overheating temperature of liquid steel 30 ±5 ℃

fluctuation of liquid surface in mold + 3 mm

the occurred rate of crack for Q235B steel decreases to 0. 36% from original 2%

and for Q345B steel decreases to 0. 98% from original 5% .

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