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| Effect of rolling process on microstructure and properties of high strength anti-seismic fire resistant steel plates |
| ZHAN Fang1, LIN Tian-zi2, YIN Shu-biao3, CAO Jian-chun1, GAO Peng1, LU Chun-xiang1 |
1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China;
2. Iron and Steel Research Institute, Anshan Iron and Steel Group, Anshan 114009, Liaoning, China;
3. Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China |
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Abstract In order to improve the yield strength of construction steel,optimize the rolling process and reduce production costs. Laboratory steel rolling experiments are combined with room temperature and high temperature tensile tests,as well as scanning and transmission electron microscopy observations. The microstructure and mechanical properties of high-strength anti-seismic refractory steel plates under four different rolling processes were studied. The results show that the microstructure of the steel plates are mainly composed of ferrite and granular bainite. When the rough rolling temperature is higher,the yield strength of room temperature and high temperature of the steel plates are higher,and the volume fraction of granular bainite is also large. When the rolling and cooling temperatures are high,the yield strength of the high temperature can meet the mechanical performance requirements of the construction fire-resistant steel plate. With the increase of the opening temperature,the yield strength of the test steel plate is further improved,but the ferrite in the structure is large and the toughness is poor. According to the results of the impact test,it can be found that as the impact temperature decreases,the fracture absorption work of the test steel plate decreases more. The analysis results of the precipitated phase show that the precipitated phases are mainly (Nb,Ti)C and (Ti,Nb,Mo)C,and the size of the precipitated phase is larger.
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Received: 02 December 2019
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2020, Vol. 55 
