Analysis on Effect of Als、N and Superheat on 40Mn2 Steel Φ50 ～60 mm Bar Crack and Technology Improvement

Guo Zhiqiang

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Analysis on Effect of Als、N and Superheat on 40Mn2 Steel Φ50 ～60 mm Bar Crack and Technology Improvement

更新时间：2025-10-28

- Analysis on Effect of Als、N and Superheat on 40Mn2 Steel Φ50 ～60 mm Bar Crack and Technology Improvement
- Special Steel Vol. 43, Issue 1, Pages: 62-65(2022)
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- Received：26 May 2021，
  
  Online First：18 March 2022，
  
  Published：18 March 2022
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Guo Zhiqiang. Analysis on Effect of Als、N and Superheat on 40Mn2 Steel Φ50 ～60 mm Bar Crack and Technology Improvement[J]. Special Steel, 2022, 43(1): 62-65.
DOI：

Guo Zhiqiang. Analysis on Effect of Als、N and Superheat on 40Mn2 Steel Φ50 ～60 mm Bar Crack and Technology Improvement[J]. Special Steel, 2022, 43(1): 62-65. DOI：

摘要

通过使用ARL8820直读光谱仪

LECO氧氮氢气体分析仪和铂铑热电偶等方法

研究了40Mn2圆钢中的Als、N和连铸钢液过热度对钢材裂纹的影响。结果表明:Als、N和连铸钢液的过热度分别为0.021%～0.035%

0.0065%～0.0083%和32～46℃的炉次Φ50～60 mm轧材表面出现了裂纹。工艺改进后

控制钢中的Als 0.015%～0.025%

[N]≤0.0060%

连铸钢液过热度18～30℃

连铸坯表面未出现裂纹

保证了轧材表面质量。

Abstract

The effect of Als、N in 40Mn2 round steel and superheat of molten steel on the steel bar crack is studied by using ARL8820 Direct-reading spectrometer

LECO oxygen-nitrogen-hydrogen gas analyzer

platinum rhodium thermocouple etc. The results show that of heats respectively with 0.021% ~ 0.035% Als

0. 0065% ~ 0. 0083% N and cast liquid superheat 32 ~ 46 ℃ the Φ50 ~60 mm rolled bar surface occurs crack. After technology improvement

with controlling 0. 015% ~ 0. 025% Als

≤0. 0060%[ N ] and the superheat of molten steel 18 ~30 ℃，the cracks on the surface of continuous casting billet non-occur and the surface quality of the products is guaranteed.

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