Heat treatment process and weldability of 100 mm thick S420 high strength steel

doi:10.13251/j.issn.0254-6051.2021.06.022

Abstract

Abstract: A 100 mm thick S420 high strength steel was designed with the concept of low C, low Si and Ni+Cr+Mo+Cu composite strengthening. Microstructure observation, mechanical property test and crack tip opening displacement CTOD test were performed before and after welding. The test results show that after quenching at 900 ℃ and tempering at 580 ℃, the comprehensive properties of the steel plate reach the best. The yield strength is 478 MPa, the tensile strength is 581 MPa, and the elongation is 28.4%. After welding, the steel plate has excellent impact property at －40 ℃. From the welded seam to the fusion line +5 mm in the transition zone, the core impact absorbed energy is stable at more than 100 J. The CTOD performance test results show that the CTOD value is as high as 1.59 mm even in the coarse grained heated-affected zone (CGHAZ) with the weakest performance.

Key words: high strength steel S420, heat treatment, weldability, crack-tip opening displacement(CTOD)

CLC Number:

TG161

Xiao Daheng, Zhang Yajing, He Hang, Tuo Chengde, Yuan Rui, Wu Huibin. Heat treatment process and weldability of 100 mm thick S420 high strength steel[J]. Heat Treatment of Metals, 2021, 46(6): 107-110.

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