Defect Characteristics and Process Optimization for Carbide Control in Continuous Casting of Cr12MoV Die Steel

Zhou Weiji; Wu Siyuan; Li Wanming; Li Xuyang; Sun Jiuhong; Lu Hui; Cao Jingdi

doi:10.20057/j.1003-8620.N260071

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Defect Characteristics and Process Optimization for Carbide Control in Continuous Casting of Cr12MoV Die Steel

Smelting and Solidification | 更新时间：2026-10-13

- Defect Characteristics and Process Optimization for Carbide Control in Continuous Casting of Cr12MoV Die Steel
- Special Steel Vol. 47, Issue 5, Pages: 48-54(2026)
- 作者机构：
  
  1.东北特殊钢集团股份有限公司，大连 116105
  2.辽宁科技大学，鞍山 114051
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N260071
  CLC： TF03
- Received：19 May 2026，
  
  Revised：2026-06-12，
  
  Accepted：16 June 2026，
  
  Published：30 September 2026
- 稿件说明：
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周伟基,伍思源,李万明等.Cr12MoV模具钢连铸缺陷特征及碳化物控制工艺优化[J].特殊钢,2026,47(05):48-54.

Zhou Weiji,Wu Siyuan,Li Wanming,et al.Defect Characteristics and Process Optimization for Carbide Control in Continuous Casting of Cr12MoV Die Steel[J].Special Steel,2026,47(05):48-54.
周伟基,伍思源,李万明等.Cr12MoV模具钢连铸缺陷特征及碳化物控制工艺优化[J].特殊钢,2026,47(05):48-54. DOI：10.20057/j.1003-8620.N260071.

Zhou Weiji,Wu Siyuan,Li Wanming,et al.Defect Characteristics and Process Optimization for Carbide Control in Continuous Casting of Cr12MoV Die Steel[J].Special Steel,2026,47(05):48-54. DOI：10.20057/j.1003-8620.N260071.

摘要

Cr12MoV模具钢是一种典型的高碳高铬冷作模具钢，由于钢中C、Cr含量较高，连铸过程中易出现凝固末期偏析及富Cr共晶碳化物聚集，从而导致表面裂纹和局部断裂等缺陷。以Cr12MoV模具钢连铸生产为背景，结合现场宏观缺陷特征、裂纹区域显微组织及共晶碳化物分布情况，分析了连铸坯裂纹与碳化物富集之间的关系，并确定最佳工艺参数：保护渣碱度0.85、1 300 ℃黏度0.05 Pa·s、熔点990 ℃；结晶器宽面水流量115 m

/h、窄面水流

量20 m

/h，冷却水水温差2.2~2.4 ℃，据此对保护渣及结晶器冷却制度进行了优化。已有工业验证结果表明，优化后连铸产品探伤合格率达到95%～97%，中心疏松级别控制在1.0～2.0级，共晶碳化物级别为2.0～3.5级，整体质量已接近同规格模铸产品水平。研究结果可为高碳高铬模具钢连铸裂纹控制及碳化物调控提供参考。

Abstract

Cr12MoV die steel is a typical high-carbon， high-chromium cold-work die steel. Due to its high carbon and chromium content， segregation during the late stages of solidification and the aggregation of eutectic chromium carbides are prone to occur during continuous casting， leading to defects such as surface cracks and localized fractures. Against the backdrop of Cr12MoV Die Stee continuous casting production， and based on the macroscopic defect characteristics observed on-site， the microstructure of the crack zones， and the distribution of eutectic carbides， the relationship between cracks in continuous casting billets and carbide enrichment was analyzed. Optimal process parameters were determined as follows： mold flux basicity of 0.85， viscosity of 0.05 Pa·s at 1 300 ℃， and melting point of 990 ℃； water flow rate of the mold wide face at 115 m³/h， water flow rate of the narrow face at 20 m³/h， and a cooling water temperature difference of 2.2-2.4 ℃. Based on these findings， the mold flux and mold cooling regimes were optimized. Existing industrial validation results indicate that， following optimization， the non-destructive testing pass rate for continuous casting products reached 95%-97%， with the center porosity grade controlled at 1.0-2.0 and the eutectic carbide grade at 2.0-3.5. Overall quality has approached the level of mold-cast products of the same specification. These research findings provide a reference for crack control and carbide regulation in the continuous casting of high-carbon， high-chromium die steels.

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references

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