Effect of residual element Sb on mechanical properties of X80 pipeline steel

doi:10.13251/j.issn.0254-6051.2023.03.041

Abstract

Abstract: X80 pipeline steel with different Sb contents was smelted in vacuum induction furnace, the effect of Sb on microstructure of the X80 pipeline steel and its existing form in the steel were investigated. The effect of Sb content on mechanical properties of pipeline steel was also studied by means of Vickers hardness testing, room temperature tensile testing and Charpy impact testing at -20 ℃. The results show that the residual element Sb in pipeline steel is uniformly distributed in the steel matrix. With the increase of Sb content from 0.0006% to 0.0980% in pipeline steel, the average size of ferrite and pearlite first increases and then decreases, the Vickers hardness firstly increases and then tends to be constant. The impact absorbed energy gradually decreases, basically, while the tensile strength and yield strength firstly decrease and then increase, and then slightly decrease. The yield ratio decreases firstly and then increases, and the elongation slightly decreases. In order to ensure mechanical properties of the X80 pipeline steel, the content of residual element Sb in the steel should be reduced as far as possible.

Key words: residual element, stibium, X80 pipeline steel, mechanical properties

CLC Number:

TG142.3

Chen Zihong, Xue Zhengliang, Liu Mengke, Zhang Xiang, Zheng Dingli, Ma Guojun. Effect of residual element Sb on mechanical properties of X80 pipeline steel[J]. Heat Treatment of Metals, 2023, 48(3): 248-253.

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