Influence of coiling temperature on properties of hot-rolled high strength steel used for mixing tank
WANG Yue-yao1,2, HE Qing1,2, ZHAO Zheng-zhi1,2, ZHANG Ming-bo3, BAO Kuo3, HUANG Yao4
1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; 2. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, Beijing 100083, China; 3. Chengde Branch, Hebei Iron and Steel Co., Ltd., Chengde 067102, Hebei, China; 4. China Electric Power Research Institute, Beijing 100192, China
Abstract：The effects of different coiling temperatures on the microstructure and properties of C-Si-Mn-Al hot-rolled high strength steel used for mixing tank were studied in the laboratory. And the structure and mechanical properties of the tested steels at different coiling temperatures were analyzed and studied by several techniques such as laser scanning confocal microscope (LSCM), scanning electron microscope (SEM), and electron backscatter diffraction (EBSD). The experimental results showed that ferrite and pearlite were obtained by coiling at 580 and 550 ℃. Ferrite and bainite were obtained at 400 ℃. Ferrite, bainite and martensite were obtained at 300 ℃. And Ferrite and martensite were obtained at 150 ℃. As the coiling temperature decreased, the tensile strength and hardness of the tested steel gradually increased, and the elongation gradually decreased. The tensile strength of the tested steel coiled at 300 ℃ was 1 029 MPa and the Vickers hardness was 342.6. The tensile strength coiled at the 150 ℃ was as high as 1 265 MPa, the Vickers hardness reached 360.7, and the yield ratio reached the lowest, only 0.58.
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2020, Vol. 30 
