Microstructure and Performance Analysis of Nb Microalloy Steel

Dou Weixue; Guo Dong; Feng Jie; Guo Zhihong; Zhu Miaoyong; Wang Xiaoli

doi:10.7513/j.issn.1004-7638.2019.01.026

Volume 40 Issue 1

Feb. 2019

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Dou Weixue, Guo Dong, Feng Jie, Guo Zhihong, Zhu Miaoyong, Wang Xiaoli. Microstructure and Performance Analysis of Nb Microalloy Steel[J]. IRON STEEL VANADIUM TITANIUM, 2019, 40(1): 148-152. doi: 10.7513/j.issn.1004-7638.2019.01.026

Citation:

Dou Weixue, Guo Dong, Feng Jie, Guo Zhihong, Zhu Miaoyong, Wang Xiaoli. Microstructure and Performance Analysis of Nb Microalloy Steel[J]. IRON STEEL VANADIUM TITANIUM, 2019, 40(1): 148-152. doi: 10.7513/j.issn.1004-7638.2019.01.026

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Microstructure and Performance Analysis of Nb Microalloy Steel

doi: 10.7513/j.issn.1004-7638.2019.01.026

1. School of Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China;
2. Technique Department, Jingye Iron and Steel Co., Ltd., Pingshan 040500, Hebei, China;
3. School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China;
4. Department of Academic Affairs, Baotou Iron & Steel Vocational Technical College, Baotou 014010, Inner Mongolia, China

Received Date: 2018-08-28

Abstract

Abstract

With the development of high speed and heavy load transportation in modern railway,higher demanding requirements have been put forward for performance of high speed rail steel.At present,domestic hot-rolled 980 MPa (U75V) rail cannot meet the requirements. Nb microalloying steel was produced in laboratory in order to develop ultra-high hardness and strength steel for speed rail.When Nb content is 0.028%,mechanical properties of high speed rail test steel reach the maximum value,ie,its tensile strength is 1 229 MPa,yield strength is 716 MPa,hardness is HB343 and elongation rate is 11%. And the microstructure performance of Nb test steel reaches the best state.Space between pearlite lamellar is 0.26 μm,and its grain size grade is ASTM No.8 to 8.5.
- high speed rail steel,
- Nb microalloying,
- mechanical properties,
- microstructure