Influence of Aluminum Content and Surface Quenching on Surface Cracking of Hot-Charging Casting Bloom of  Cold-Heading Steel SWRCH22A

李永超; 李宝秀; 郭明仪; 阎丽珍

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Influence of Aluminum Content and Surface Quenching on Surface Cracking of Hot-Charging Casting Bloom of Cold-Heading Steel SWRCH22A

更新时间：2026-01-21

- Influence of Aluminum Content and Surface Quenching on Surface Cracking of Hot-Charging Casting Bloom of Cold-Heading Steel SWRCH22A
- Special Steel Vol. 37, Issue 1, Pages: 40-42(2016)
- 作者机构：
  
  1. 邢台钢铁有限责任公司,邢台,054027
  2. 河北省线材工程技术研究中心,邢台,054027
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：10 August 2015，
  
  Online First：25 August 2022，
  
  Published：25 August 2016
- 稿件说明：
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李永超, 李宝秀, 郭明仪, et al. Influence of Aluminum Content and Surface Quenching on Surface Cracking of Hot-Charging Casting Bloom of Cold-Heading Steel SWRCH22A[J]. Special Steel, 2016, 37(1): 40-42.
DOI：

李永超, 李宝秀, 郭明仪, et al. Influence of Aluminum Content and Surface Quenching on Surface Cracking of Hot-Charging Casting Bloom of Cold-Heading Steel SWRCH22A[J]. Special Steel, 2016, 37(1): 40-42. DOI：

摘要

SWRCH22A钢炼钢工艺流程为80 t顶底复吹转炉-LF-280 mm×325 mm坯连铸。分析得出SWRCH22A钢热送铸坯表面开裂的原因主要是铸坯在冷却过程中

AlN在晶界析出

弱化了晶界

在热应力和组织应力的作用下导致开裂。通过将铸坯的Al含量从0.053%降低至0.042%

氮含量从0.005 5%降至0.0041%

以及铸坯加热前进行在线表面淬火

有效抑制AlN析出

使热送铸坯合格率由77.9%提高至100%。

Abstract

Steelmaking process flowsheet for steel SWRCH22A is 80 t top and bottom combined blown converter-LF- 280 mm x 325 mm bloom casting. It is obtained by analysis that main cause for surface crack of hot-charging casting bloom of steel SWRCH22A is AIN precipitated at grain boundary during cooling to weaken the boundary and lead to crack under action of thermal stress and structure stress. With decreasing the Al content in bloom from 0. 053% to 0. 042%

decreasing nitrogen content from 0.005 5% to 0. 004 1%

as well as in-line surface quenching bloom before heating

the AIN precipitation is effectively inhibited

and the qualified ratio of hot-charged casting bloom increases from 77. 9% to 100%.

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Hot Deformation Behavior and Dynamic Recrystallization of Cold Heading Steel SWRCH22A

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