Effect of Carbon Macro-Segregation of Casting Bloom on Banded Structure of Rolled Bar of Gear Steel 20CrMnTiH

Special Steel ›› 2012, Vol. 33 ›› Issue (5): 51-53.

Previous Articles Next Articles

Effect of Carbon Macro-Segregation of Casting Bloom on Banded Structure of Rolled Bar of Gear Steel 20CrMnTiH

Liu Jian¹ , Yan Huicheng², Tang Wei¹ , Zhu Wenbing¹ , Xu Weiyang² , Tang Guangbo²

1 Xiangtan Iron and Steel Co Ltd, Hunan Valin, Xiangtan 411101 ；
2 National Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081

Received:2012-03-25 Online:2012-10-01 Published:2022-10-10

20CrMnTiH齿轮钢铸坯宏观碳偏析对轧材带状组织的影响

刘建¹, 颜慧成², 唐薇¹, 朱文彬¹, 许伟阳², 唐广波²

1 湖南华菱湘潭钢铁有限公司，湘潭411101；
2 钢铁研究总院国家连铸技术工程研究中心，北京100081

作者简介:刘建(1974-),男,工程师,2000年湘潭大学毕业,轧钢工艺和金属热处理研究。

Abstract

Abstract: Production flow sheet for Φ130 mm round bar of steel 20CrMnTiH is 120 t BOF-LF-VD-300 mm x430 mm bloom casting-continuous rolling. Carbon macro-segregation of rolled bar and casting bloom produced by different continuous casting process (liquid supper-heating extent 15 ~30℃ , electromagnetic stirring with 0-400 A) show that higher supper- heating extent and stronger mold electromagnetic stirring aggravate the carbon macro-segregation of bloom and rolled bar of steel 20CrMnTiH, and the serious carbon macro-segregation intensifies dendritic crystal segregation increases rating of banded structure of steel, and enhances hardness value of positive carbon segregation region of annealed steel products.

Key words: Gear Steel 20CrMnTiH, Carbon Macro-Segregation, Banded Structure, Hardness

摘要： 20CrMnTiH钢Φ130 mm圆钢的生产工艺流程为120 t BOF-LF-VD-300 mm×430 mm坯连铸-连轧。不同连铸工艺(过热度15～30℃,电磁搅拌0～400 A)生产的连铸坯和轧材的宏观碳偏析表明,较高的过热度和过强的结晶器电磁搅拌会加重20CrMnTiH钢连铸坯和轧材的宏观碳偏析;严重的宏观碳偏析,加剧晶枝偏析,提高钢的带状组织级别并提高退火钢材正偏析区的硬度值。

Liu Jian , Yan Huicheng, Tang Wei , Zhu Wenbing , Xu Weiyang, Tang Guangbo. Effect of Carbon Macro-Segregation of Casting Bloom on Banded Structure of Rolled Bar of Gear Steel 20CrMnTiH[J]. Special Steel, 2012, 33(5): 51-53.

刘建, 颜慧成, 唐薇, 朱文彬, 许伟阳, 唐广波. 20CrMnTiH齿轮钢铸坯宏观碳偏析对轧材带状组织的影响[J]. 特殊钢, 2012, 33(5): 51-53.

[1]	Wang Min, Guo Zhiqiang. Pilot Production of Gear Steel 20CrMnTiH to Control Oxygen Content and Inclusions in Steel [J]. Special Steel, 2020, 41(2): 18-20.
[2]	Du Dongfii, Zhao Xiqing, Zhang Jianyuan, Tian Jinglin, Jia Wenjun. Process Practice on Improving Metallurgical Quality of Gear Steel 20CrMnTiH [J]. Special Steel, 2018, 39(2): 34-37.
[3]	Liu Nianfu. Development of Gear Steel 20CrMnTiH with Narrow Hardenability Band [J]. Special Steel, 2018, 39(1): 41-43.
[4]	Bai Ruijuan, Wang Changjie, Dong Zhaili, Zhu Zhenguo, Wang Qingbo , Han Huaibin. Effect of Warm-Forging and Isothermal Normalizing on Austenite Grain Size of Carburized and Quenched Gear Steel 20CrMnTiH3 [J]. Special Steel, 2016, 37(3): 61-63.
[5]	Gao Ju , Ding Zhijun , Li Hui. Analysis on Influence Factors of Control of Inclusions in Gear Steel 20CrMnTiH (TS) and Process Optimization [J]. Special Steel, 2015, 36(5): 39-42.
[6]	Li Ququan, Yan Huicheng, Zeng Fanzheng , Liu Jian, Tang Guangbo. Effect of Metal Rheology of Gear Steel 20CrMnTiH in Rolling Process on Carbon Segregation of Casting Bloom [J]. Special Steel, 2015, 36(1): 14-16.
[7]	Shen Jingxia, Zheng Yan, Zhang Haixia, Zhu Rong. Effect of Sulphide on Cutting Characteristics of Sulphur Bearing Gear Steel 20CrMnTiH [J]. Special Steel, 2012, 33(3): 47-49.
[8]	Liu Zonghui , Qin Fengting , Wang Hongwei. Process Practice of Production for Gear Steel 20CrMnTiH by 60 t BOF-LF-VD-CC Flow Sheet [J]. Special Steel, 2011, 32(4): 36-38.
[9]	Lin Ping, Liu Liu , Wang Fuli, He Qing. A Study on Thermodynamics and Control Technology of Calcium Treatment for Gear Steel 20CrMnTiHl Containing Sulfur [J]. Special Steel, 2010, 31(2): 1-4.
[10]	Liu Shihong, Wu Shoufang , Li Hong, Wang Gongliang, Liang Mei , Wang Xinhua. A Study on Heat Simulation of Surface Longitudinal Crack of Gear Steel 20CrMnTiH Concasting Billet [J]. Special Steel, 2007, 28(6): 1-3.
[11]	Tao Jianjun , Zhu Huigang , Wu Xiaolin. Effect of Carbon Segregation and Residual B on Hardenability of Gear Steel 20CrMnTiH1 [J]. Special Steel, 2007, 28(5): 58-59.
[12]	Pu Xuekun, Ke Xiaotao, Deng Tongwu. Pilot Production of Narrow Hardenability Band Gear Steel 20CrMnTiH by 120 t Converter-LF+RH Process at Panzhihua Steel [J]. Special Steel, 2007, 28(4): 50-51.

Effect of Carbon Macro-Segregation of Casting Bloom on Banded Structure of Rolled Bar of Gear Steel 20CrMnTiH

20CrMnTiH齿轮钢铸坯宏观碳偏析对轧材带状组织的影响

PDF

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 12

Recommended Articles

Metrics

Comments