Analysis on Causes of Delamination Defect at 148 mm Heavy Thickness Plate Tail of 2.25Cr-1Mo-0.25V Steel and Control Process

侯敬超; 赵国昌; 庞辉勇; 吴艳阳; 甄光楠; 赵燕青

doi:10.20057/j.1003-8620.2022-00105

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Analysis on Causes of Delamination Defect at 148 mm Heavy Thickness Plate Tail of 2.25Cr-1Mo-0.25V Steel and Control Process

更新时间：2026-01-21

- Analysis on Causes of Delamination Defect at 148 mm Heavy Thickness Plate Tail of 2.25Cr-1Mo-0.25V Steel and Control Process
- Special Steel Vol. 44, Issue 2, Pages: 43-47(2023)
- 作者机构：
  
  1. 河钢集团舞钢公司，舞钢,462500
  2. 河钢集团钢研总院,石家庄,050023
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2022-00105
  CLC：
- Received：20 August 2022，
  
  Online First：27 March 2023，
  
  Published：27 March 2023
- 稿件说明：
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侯敬超, 赵国昌, 庞辉勇, et al. Analysis on Causes of Delamination Defect at 148 mm Heavy Thickness Plate Tail of 2.25Cr-1Mo-0.25V Steel and Control Process[J]. Special Steel, 2023, 44(2): 43-47.
DOI：

侯敬超, 赵国昌, 庞辉勇, et al. Analysis on Causes of Delamination Defect at 148 mm Heavy Thickness Plate Tail of 2.25Cr-1Mo-0.25V Steel and Control Process[J]. Special Steel, 2023, 44(2): 43-47. DOI： 10.20057/j.1003-8620.2022-00105.

摘要

采用扫描电镜及电子探针对55t 钢锭成材148mm 厚2.25Cr-1Mo-0.25V钢板尾部分层缺陷进行观察分析，结果表明：分层缺陷是由于模铸保护渣卷入钢液造成的。为减少钢板尾部分层缺陷，对冶炼工艺进行优化，精炼过程中采用碳粉、电石及1.2～2.0kg/tAl 线复合脱氧工艺，真空后软吹12～14 min

采用高粘度、低熔点、高熔速及膨胀系数较大的模铸保护渣。优化工艺后，钢板尾部分层缺陷出现概率分别为11.3%、9.6%、6.9%

分层缺陷导致钢板废品率由原8.1%降至1.7%。

Abstract

The delamination defects at the tail of 148 mm thickness 2.25Cr-1Mo-0.25V steel plate made of 55 t ingot is observed and analyzed by scanning electron microscope and electron probe microanalysis. The results show that the delamination defects are caused by the involvement of mold flux in the molten steel. In order to reduce the delamination defects at the tail of steel plate the smelting process is optimized

i.e. in refining process

the composite deoxidation process of carbon powder

calcium carbide and 1.2-2.0 kg/t

steel

Al line is adopted. After vacuum

it is soft blown for 12-14 min. The mold casting protective slag with high viscosity

low melting point

high melting rate and large expansion coefficient is used. After optimizing the smelting process

the ratio of delamination defects at

the tail of steel plate is 11.3%

9.6% and 6.9% respectively

and the scrap rate of steel plate caused by delamination defects decreases from original 8.1% to 1.7%.

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