Cause Analysis on Surface Crack of Drill Steel 55SiMnMo Rolling Product and Process Improvement

赵景存; 朱叶

doi:10.20057/j.1003-8620.2022-00100

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Cause Analysis on Surface Crack of Drill Steel 55SiMnMo Rolling Product and Process Improvement

更新时间：2026-01-21

- Cause Analysis on Surface Crack of Drill Steel 55SiMnMo Rolling Product and Process Improvement
- Special Steel Vol. 44, Issue 1, Pages: 45-48(2023)
- 作者机构：
  
  (石钢京诚装备技术有限公司，),营口,115000
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2022-00100
  CLC：
- Online First：30 January 2023，
  
  Published：30 January 2023
- 稿件说明：
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赵景存, 朱叶. Cause Analysis on Surface Crack of Drill Steel 55SiMnMo Rolling Product and Process Improvement[J]. Special Steel, 2023, 44(1): 45-48.
DOI：

赵景存, 朱叶. Cause Analysis on Surface Crack of Drill Steel 55SiMnMo Rolling Product and Process Improvement[J]. Special Steel, 2023, 44(1): 45-48. DOI： 10.20057/j.1003-8620.2022-00100.

摘要

针对100 t BOF-LF-VD-Φ450 mm连铸坯-Φ200 mm轧材流程生产的钎具钢55SiMnMo轧材表面易产生裂纹缺陷，分析对比了过热度、二次冷却、拉速、成分(Ti.B)等对缺陷的影响。通过工艺改进；控制钢水过热度20～30℃

控制B含量≤0.0008%

加Ti 0.015%～0.025%

拉速0.41 m/min

二冷比水量0.17 L/kg

使裂纹的缺陷率由原来的12.2%降低到1.6%。

Abstract

The surface of rolled products of drill steel 55SiMnMo produced by 100 t BOF-LF-VD-4450 mm CC bloom- φ200 mm rolling bar production process is prone to surface crack.The effect of superheat

secondary cooling

casting speed and composition(Ti.B)on defects are analyzed and compared. Through process improvement which is obtained that by controlling superheat 20-30 ℃

B content controlled≤0.0008%

Ti content 0.015%-0.025%

drawing speed 0.41 m/min

and secondary cooling ratio 0.17 L/kg

the crack defect rate decreases from 12.2% to1.6%.

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