Effect of Mechanical Reduction Process of 22MnB5 Steel Slab

Cao Kun; Qu Shuo; Liu Zhen; Gong Yukun; Lin Yuwen

doi:10.20057/j.1003-8620.2025-00173

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Effect of Mechanical Reduction Process of 22MnB5 Steel Slab

Smelting and Solidification | 更新时间：2026-03-03

- Effect of Mechanical Reduction Process of 22MnB5 Steel Slab
- Special Steel Vol. 47, Issue 2, Pages: 100-107(2026)
- 作者机构：
  
  1.唐山惠唐新事业股份有限公司，唐山 063000
  2.河钢集团唐钢公司，唐山 063000
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2025-00173
  CLC： TF777
- Received：24 July 2025，
  
  Published：30 March 2026
- 稿件说明：
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曹堃,曲硕,刘震等.机械压下工艺对22MnB5钢板坯质量的影响[J].特殊钢,2026,47(02):100-107.

Cao Kun,Qu Shuo,Liu Zhen,et al.Effect of Mechanical Reduction Process of 22MnB5 Steel Slab[J].Special Steel,2026,47(02):100-107.
曹堃,曲硕,刘震等.机械压下工艺对22MnB5钢板坯质量的影响[J].特殊钢,2026,47(02):100-107. DOI： 10.20057/j.1003-8620.2025-00173.

Cao Kun,Qu Shuo,Liu Zhen,et al.Effect of Mechanical Reduction Process of 22MnB5 Steel Slab[J].Special Steel,2026,47(02):100-107. DOI： 10.20057/j.1003-8620.2025-00173.

摘要

针对1 400 mm×300 mm厚度的22MnB5钢板坯内部质量问题，构建了板坯凝固过程的动网格机械压下模型，该模型综合考虑了流动、传热、凝固和溶质等多物理场因素，分析了压下量和压下区间对铸坯内部质量的影响。研究表明，施加机械压下可以有效改善铸坯中心偏析，且压下量越大，改善效果越明显。特别是当施加10 mm压下时，铸坯中心偏析显著减轻，偏析比降低。此外，压下位置的选择也至关重要，在拉速1.0 m/min、过热度20 ℃条件下，当压下位置位于距结晶器弯月面14~18 m区间、固相率为0.05~0.45时，偏析现象加剧；而当压下位置位于距结晶器弯月面16~20 m区间、固相率为0.2~0.95时，压下操作能够有效促进溶质迁移，从而改善铸坯的偏析问题。

Abstract

To address the internal quality issues of 1 400 mm × 300 mm thick 22MnB5 steel slabs， a dynamic mesh mechanical soft-reduction model for slab solidification was developed. This model integrates multiple physical fields， including fluid flow， heat transfer， solidification， and solute transport， to analyze the effects of reduction amount and reduction zone on slab internal quality. The results show that mechanical soft reduction can effectively mitigate centerline segregation， and the improvement becomes more pronounced with increasing reduction amount. In particular， when a 10 mm reduction is applied， centerline segregation is significantly alleviated， with a notable decrease in the segregation ratio. Furthermore， the selection of reduction position is critical. Under a casting speed of 1.0 m/min and a superheat of 20 °C， applying reduction in the region 14 m-18 m below the mold meniscus， where the solid fraction is 0.05-0.45， exacerbates segregation. Conversely， when reduction is applied in the region 16-20 m below the meniscus， corresponding to a solid fraction of 0.20-0.95， solute transport is promoted， thereby improving segregation in the slabs.

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references

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