Production process of Q960E high strength and high toughness steel

doi:10.13251/j.issn.0254-6051.2021.07.035

Abstract

Abstract: Microstructure and mechanical properties of the Q960E steel plate after quenching and different tempering processes were studied in detail through the determination of phase transformation point and static CCT curve by using the design idea of low and medium carbon,multi-alloyed by Nb, V, Cr, Mo, Cu, Ni and other trace elements alloying composition. The results show that when the cooling rate is 0.1-1 ℃/s, the microstructure is mainly ferrite + granular bainite. With the increase of cooling rate, the transformation of ferrite is restrained and gradually transforms to bainite and martensite. When cooling rate is greater than 10 ℃/s, microstructure is all martensite. After tempering at 150 ℃, 180 ℃ and 210 ℃,respectively, the strength of quenched steel plate increases with the tempering temperature, strength decreases continuously, the plasticity increases, the toughness increases first and then decreases. The comprehensive performance of the steel plate tempered at 180 ℃ is the best match, with yield strength of 1050 MPa, tensile strength of 1140 MPa, elongation after fracture of 11.0%, and KV₂ at -40 ℃ above 60 J.

Key words: Q960E steel, high strength steel, high toughness steel

CLC Number:

TG156.1

Li Canming. Production process of Q960E high strength and high toughness steel[J]. Heat Treatment of Metals, 2021, 46(7): 182-186.

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