Aging and annealing process of X80 pipeline steel after uniform plastic deformation

doi:10.13251/j.issn.0254-6051.2021.08.031

Abstract

Abstract: Uniform plastic deformation before necking of the X80 pipe steel was simulated by setting different extent of pre-strains, and the effect of different heat treatment method (strain aging and annealing) on properties of the pipeline steel with such uniform plastic pre-deformation was studied. The results show that tensile curves of the X80 pipeline steel without heat treatment have the feature of continuous yield without obvious yield platform. After pre-tension in the stage of uniform plastic deformation, the pipe has obvious work hardening, and the maximum increment of yield strength reaches 148 MPa. The elongation and strain hardening index of the pipe reduce with the increase of pre-strain. After aging at 260 ℃, the tensile curves of the pre-strain pipe show a yield platform, the yield strength continues to rise, but the elongation continues to decrease, and the strain hardening performance has no obvious change. After annealing at 660 ℃, the tensile curves of the pre-strain pipe show an obvious yield platform, the yield strength is lower than that of the original pipe, and the performance parameters, such as yield ratio, elongation and strain hardening index, are significantly improved.

Key words: pipeline steel, uniform plastic deformation, aging, annealing, strain hardening performance

CLC Number:

TG113.25

Xu Yan, Liu Yinglai, Li Liang, Nie Xianghui, Feng Zhenjun, Guo Lei, Liu Zhipeng. Aging and annealing process of X80 pipeline steel after uniform plastic deformation[J]. Heat Treatment of Metals, 2021, 46(8): 170-173.

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