Analysis on Formation of Surface Longitudinal Crack of Steel Q235B and Q345B Medium-Heavy Plate and Process Optimization

陈振业; 张阔斌; 王云阁; 尹绍江; 李建新; 刘铁力

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Analysis on Formation of Surface Longitudinal Crack of Steel Q235B and Q345B Medium-Heavy Plate and Process Optimization

更新时间：2026-01-21

- Analysis on Formation of Surface Longitudinal Crack of Steel Q235B and Q345B Medium-Heavy Plate and Process Optimization
- Special Steel Vol. 36, Issue 6, Pages: 30-32(2015)
- 作者机构：
  
  1. 河北钢铁技术研究总院,石家庄,052165
  2. 唐山中厚板材有限公司,唐山,063000
  3. 河北钢铁集团唐山钢铁有限责任公司技术中心,唐山,063000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：15 June 2015，
  
  Online First：12 August 2022，
  
  Published：12 August 2015
- 稿件说明：
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陈振业, 张阔斌, 王云阁, et al. Analysis on Formation of Surface Longitudinal Crack of Steel Q235B and Q345B Medium-Heavy Plate and Process Optimization[J]. Special Steel, 2015, 36(6): 30-32.
DOI：

陈振业, 张阔斌, 王云阁, et al. Analysis on Formation of Surface Longitudinal Crack of Steel Q235B and Q345B Medium-Heavy Plate and Process Optimization[J]. Special Steel, 2015, 36(6): 30-32. DOI：

摘要

Q235B钢（/%:0.14~0.17C

0.30~0.60Mn

0.010~0.040Als）和Q345B钢（/%:0.15~0.18C

1.30~1.60Mn

0.010~0.040Als）100 mm厚板的生产流程为铁水预处理-120 t转炉-LF-200 mm板坯连铸-轧制工艺。通过分析得出中厚板表面纵裂纹源于铸坯裂纹。通过保护渣碱度由1.16提高至1.26

1300℃黏度由0.80Pa·s提高至0.97 Pa·s

软搅拌时间不低于10 min

拉速控制在1.0 m/min左右

液面上下波动≤5 mm

保持结晶器锥度9.0 mm

钢水过热度20~25℃

二冷水为0.662 L/kg等工艺措施

使Q235B和Q345B钢中厚板纵裂率由2.17%下降至1.08%

板材综合合格率由原94.78%提高到98.16%。

Abstract

The flowsheet of 100 mm heavy plate of steel 235B (/% : 0.14 ~0.17C

0. 30 ~ 0.60Mn

0.010 ~ 0. 040Als) and steel Q345B (/% : 0. 15 ~0.18C

1. 30 ~1. 60Mn

0. 010 ~ 0. 040Als) is hot metal pretreatment-120 t converter-LF-220 mm slab casting- rolling process. By analysis it is obtained that the surface cracks of medium-heavy plate originate from cracks of casting slab. With using the process measures including increasing basicity of mold shielding slag from 1.16 to 1. 26

increasing its viscosity at 1 300 °C from 0. 80 Pa·s to 0. 97 Pa·s

soft stirring time no-less than 10 min

controlling casting speed about 1. 0 m/min； liquid surface up and down ≤5 mm； maintaining mold cone 9. 0 mm； liquid superheat extent 20 ~25 °C and secondary water rate 0. 662 L/kg

the ratio of longitudinal cracks of steel Q235B and Q345B medium-heavy plate decreases from original 2.17% to 1. 08%

and the comprehensive qualified ratio of plate products increases to 98. 16% from original 94. 78%.

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