Influence of normalizing treatment on lamellar tearing resistance of super thick H-section steel for building structure

doi:10.13251/j.issn.0254-6051.2023.01.030

Abstract

Abstract: Ultra-thick hot-rolled H-section steel for building structure was normalized at 920 ℃, the microstructure of hot-rolled and normalized H-section steel was observed by using optical microscope and scanning electron microscope, and the difference of lamellar tearing resistance (Z-direction performance) and its relationship with microstructure were compared and analyzed.The results show that after normalizing,fine ferrite+ultrafine pearlite structure is obtained,the microstructure uniformity is significantly improved, and the grain refinement is obviously. Comparing with the hot-rolled steel, the tensile strength of the normalized steel increases by about 12 MPa, and the percentage reduction of area increases by about 13%. The refinement of matrix structure and spheroidization of inclusions after normalizing have a greater improvement on Z-direction mechanical property of the H-section steel.

Key words: H-section steel, normalizing treatment, microstructure, inclusion, lamellar tearing resistance

CLC Number:

TG142.7

Zhao Peilin, Yang Dong, Wu Huiliang, Liu Chao, Li Chao, Li Chunchuan, Zheng Li. Influence of normalizing treatment on lamellar tearing resistance of super thick H-section steel for building structure[J]. Heat Treatment of Metals, 2023, 48(1): 175-180.

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