Development of 800 MPa grade microalloyed steel for high toughness longitudinal welded pipe

doi:10.13251/j.issn.0254-6051.2023.03.037

Abstract

Abstract: 800 MPa high-toughness microalloyed steel longitudinal welded pipe was produced by ultra-fast cooling after hot rolling. Microstructure and properties of different regions of the tested steel were studied by means of OM, SEM, TEM and tensile testing. The results show that the hot-rolled structure of the tested steel is mainly granular bainite+a small amount of lath bainite, the amount of granular bainite in the welding heat affected zone reduces to 32.7%, and the lath bainite increases to 30.5%, acicular ferrite and a small amount of martensite appear in the microstructure. The hot rolling zone of the tested steel is mainly composed of Ti for composite microalloying, and the comprehensive application of solution strengthening, fine grain strengthening, dislocation strengthening and precipitation strengthening, the yield strength, tensile strength, and elongation are 804 MPa, 852 MPa and 21.5%, and shows high strong toughness.

Key words: microalloying, high toughness, longitudinal welded pipe, precipitation strengthening

CLC Number:

TG113.1

Xiong Weiliang, Yan Lixin, Liang Liang, Wu Teng, Wu Run, Su Changzhu. Development of 800 MPa grade microalloyed steel for high toughness longitudinal welded pipe[J]. Heat Treatment of Metals, 2023, 48(3): 226-229.

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