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| Effect of coiling temperature on microstructure and properties of 800 MPa-level high hole expansion steel |
| LIU Yang, LU Qianqian, GU Hairong, MA Cong, CHEN Zhong, TIAN Zhijun |
| Technology Center, Maanshan Iron and Steel Co., Ltd., Ma′anshan 243000, China |
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Abstract The microstructure, mechanical property and hole expansion property of 800 MPa-level hot-rolled acid-pickled hole expansion steel at different coiling temperatures were analyzed by optical microscope, scanning electron microscope, tensile tester and hole punching expansion tester. The results showed that the microstructure was mainly composed of ferrite + bainite when the coiling temperature was 450-600 ℃. With the increase of coiling temperature, the ferrite grains increased, while the volume fraction of bainite decreased gradually. The yield strength and tensile strength of the material were improved, the elongation had no significant change, and the hole expansion rate was reduced obviously. With overall consideration, when the coiling temperature was 450-500 ℃, the tensile strength was higher than 780 MPa, and the hole expansion rate was above 50%.
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Received: 11 May 2023
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2024, Vol. 42 
