Effect of self-tempering temperature on microstructure and properties of high strength fire-resistant and weathering construction steel with low yield ratio

doi:10.13251/j.issn.0254-6051.2020.06.008

Abstract

Abstract: Microstructure and properties of high strength fire-resistant and weathering construction steel with low yield ratio at different self-tempering temperatures were studied by OM, SEM and TEM. The results show that when the self-tempering temperature of the steel plate after water cooling is decreased from 550 ℃ to 350 ℃, the microstructure of the tested steel gradually changes from ferrite and a small amount of bainite to multiphase structure consisting of lath bainite and dispersed fine M-A islands. The size of bainite lath is further refined, the yield strength and yield ratio of the steel plate increase obviously, the tensile strength does not change much, and the percentage elongation after fracture decreases. When the self-tempering temperature is within the range of 450-500 ℃, the tested steel has lower yield ratio and better strength-toughness matching.

Key words: high strength fire-resistant and weathering construction steel, self-tempering temperature, microstructure, properties, low yield ratio

CLC Number:

TG142.1

Lin Tianzi, Hou Huaxing, Yang Ying, Zhang Tao, Zhang Zhe, Ji Wenbo. Effect of self-tempering temperature on microstructure and properties of high strength fire-resistant and weathering construction steel with low yield ratio[J]. Heat Treatment of Metals, 2020, 45(6): 39-42.

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