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Nonmetallic Inclusion Control of 350 km/h High Speed Rail Steel |
ZHAO Ke-wen1,2,ZENG Jian-hua2,WANG Xin-hua1 |
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2. Panzhihua Iron and Steel Group Co, Panzhihua 617067, Sichuan, China |
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Abstract Inclusion has an important effect on quality of high speed rail steel. In consideration of the lower acceptance percentage of the inclusion and its constraint against the requirement for large scale production of 350 km/h high speed rail steel in Panzhihua Iron and Steel (Group) Co, the technology of nonmetallic inclusion control for 350 km/h high speed rail steel was studied. An optimized model of the argon-blowing in ladle furnace (LF), the control of the components of the ladle slag, and the technique of calcium treatment for the molten steel was brought forward. Using the researched technology, the removal ratio of the inclusion was increased and the components, distribution, and shape of the inclusion in the rail steel were changed, which resulted in a reduction in the average total oxygen content to 10. 17×10-6 and an increase in the comprehensive acceptance percentage of the nonmetallic inclusion from 48. 21% to 98. 1%. Test has shown that this metallurgical technology can meet the requirement for large scale production of 350 km/h high speed steel in Panzhihua Iron and Steel (Group) Co.
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[1] |
Hai-yan Tang*,Yong Wang,Guang-hui Wu,Peng Lan,Jia-quan Zhang. Inclusion evolution in 50CrVA spring steel by optimization of refining slag[J]. Chinese Journal of Iron and Steel, 2017, 24(9): 879-887. |
[2] |
Hao Li,Yan-chong Yu,,Xiang Ren,Shao-hua Zhang,She-bin Wang,,*. Evolution of Al2O3 inclusions by cerium treatment in low carbon high manganese steel[J]. Chinese Journal of Iron and Steel, 2017, 24(9): 925-934. |
[3] |
Liang Yang,,Bryan A. Webler,Guo-guang Cheng. Precipitation behavior of titanium nitride on a primary inclusion particle during solidification of bearing steel[J]. Chinese Journal of Iron and Steel, 2017, 24(7): 685-690. |
[4] |
Rui Wang,Yan-ping Bao,*,Yi-hong Li,Tai-quan Li,Di Chen. Effect of slag composition on steel cleanliness in interstitial-free steel[J]. Chinese Journal of Iron and Steel, 2017, 24(6): 579-585. |
[5] |
Ze-an Lv,,Hong-wei Ni,,*,Hua Zhang,,Cheng-song Liu,,**. Evolution of MnS inclusions in Ti-bearing X80 pipeline steel[J]. Chinese Journal of Iron and Steel, 2017, 24(6): 654-660. |
[6] |
Cheng-song Liu,Xiao-qin Liu,*,Hong-wei Ni,Shu-feng Yang,Jing-she Li,Fei Ye. Effect of vanadium on modification of inclusions in Mn- and Si-deoxidized steel during heat treatment at 1473 K[J]. Chinese Journal of Iron and Steel, 2017, 24(5): 520-528. |
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