Effect of Ti microalloying on microstructure and properties of fire-resistant construction steel

doi:10.13251/j.issn.0254-6051.2022.02.002

Abstract

Abstract: Three kinds of tested steels were designed with low Mo and Ti multi-microalloying, and reasonable thermo-mechanical control process(TMCP) was explored. The low cost 460 MPa grade fire-resistant steel was successfully developed. Through the test of mechanical properties and microstructure analysis, the results show that the ideal microstructure of fire-resistant steel is obtained, which is granular bainite and M/A island. With the increase of Ti content, the average grain size of the tested steel decreases. The room temperature yield strength of the three tested steels are all higher than 460 MPa, and the yield strength at high temperature of 600 ℃ for 3 h is higher than 307 MPa, which indicates that the three tested steels all have excellent mechanical properties at high temperature. Under the combined action of phase transformation strengthening, precipitation strengthening, fine grain strengthening and dislocation strengthening, the tested steels with different Ti contents obtain good high temperature mechanical properties. Among them, the YS value (600 ℃ yield strength/room temperature yield strength) of the tested steel with 0.07% Ti is 0.68, which fully meets the using standard of fire-resistant steel.

Key words: fire-resistant steel, Ti microalloying, TMCP, microstructure, mechanical properties

CLC Number:

TG142

Zhang Pengcheng, Wu Huibin. Effect of Ti microalloying on microstructure and properties of fire-resistant construction steel[J]. Heat Treatment of Metals, 2022, 47(2): 9-13.

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