25MnCrNiMoA钢Φ120mm轧材表面裂纹分析与工艺改进

吕安明; 李猛; 刁峰; 张庆

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25MnCrNiMoA钢Φ120mm轧材表面裂纹分析与工艺改进

工艺技术 | 更新时间：2026-01-21

- 25MnCrNiMoA钢Φ120mm轧材表面裂纹分析与工艺改进
- An Analysis on Surface Cracks of Φ120mm Rolled Products of Steel 25MnCrNiMoA and Process Improvement
- 特殊钢 2018年39卷第2期页码：38-40
- 作者机构：
  
  山钢股份莱芜分公司特钢事业部,莱芜,271104
- 作者简介：
  
  [ "吕安明(1986-),男，工程师,2009年内蒙古科技大学(本科)毕业，炼钢、连铸工艺技术管理。" ]
- 基金信息：
- DOI：
  中图分类号：
- 收稿：2017-11-15，
  
  网络首发：2022-06-30，
  
  纸质出版：2018-06-30
- 稿件说明：
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吕安明, 李猛, 刁峰, 等. 25MnCrNiMoA钢Φ120mm轧材表面裂纹分析与工艺改进[J]. 特殊钢, 2018,39(2):38-40.

吕安明, 李猛, 刁峰, et al. An Analysis on Surface Cracks of Φ120mm Rolled Products of Steel 25MnCrNiMoA and Process Improvement[J]. Special Steel, 2018, 39(2): 38-40.
吕安明, 李猛, 刁峰, 等. 25MnCrNiMoA钢Φ120mm轧材表面裂纹分析与工艺改进[J]. 特殊钢, 2018,39(2):38-40. DOI：

吕安明, 李猛, 刁峰, et al. An Analysis on Surface Cracks of Φ120mm Rolled Products of Steel 25MnCrNiMoA and Process Improvement[J]. Special Steel, 2018, 39(2): 38-40. DOI：

摘要

25MnCrNiMoA 钢(/%：0.25~0.26C

0.22~0.25Si

1.25~1.30Mn

0.008~0.011P

0.002~0.004S

0.45~0.50Cr

0.36~0.38Ni

0.24~0.26Mo

0.04~0.08Cu

0.025~0.031Alt)的生产流程为100t UHP EAF-LF-VD-Φ650mm坯连铸-轧制Φ120mm材。试制过程热轧材出现批量表面裂纹。通过对轧材表面裂纹缺陷部位组织观察和分析，发现裂纹附近组织存在明显的脱碳及夹杂物

并且裂纹末端存在多条铁素体条带，表明连铸坯质量缺陷是25MnCrNiMoA圆钢产生表面裂纹的主要原因。通过控制[S]≤0.003%

连铸时液面波动≤2mm

拉速0.26 m/min

过热度20~30℃

降低二冷水量，矫直温度≥950°C，优化保护渣组成等工艺措施，避免了25MnCrNiMoA钢热轧材表面裂纹的形成。

Abstract

The production flowsheet of steel 25MnCrNiMoA (/%: 0.25~0.26C

0.22~0.25Si

1.25~1.30Mn

0.008~0.011P

0.002~0.004S

0.45~0.50Cr

0.36~0. 38Ni

0.24~0.26Mo

0.04~0.08Cu

0.025~0.031Alt) is 100t UHP EAF-LF-VD-Φ650mm bloom casting-rolling to Φ120mm products. By observing and analysis on structure at crack area

it is found that there is obvious decarburization and inclusions in structure near the cracks

and multi-ferrite strips exist at end of cracks

it shows that the quality defects of casting bloom are main reason to form surface cracks of round bar of steel 25MnCrNiMoA. With the process measures including controlling [S]≤0.003%

liquid surface fluctuation ≤2mm during casting

casting speed 0.26m/min

overheating extent of liquid 20~30°C，decreasing secondary water rate

straightening temperature of bloom ≥950°C and optimizing ingredient of shielding slag

the surface cracks of hot-rolled products of steel 25MnCrNiMoA are avoided.

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