Welding and heat treatment process of 12Cr2Mo1VR/20MnMoNb dissimilar steel joint in auxiliary equipment of power plant

doi:10.13251/j.issn.0254-6051.2021.10.027

Abstract

Abstract: For the 12Cr2Mo1VR/20MnMoNb dissimilar steel joints in the auxiliary equipment of the power station, the transition method of the ferrite surfacing layer was designed by studying the joint characteristics, high temperature allowable stress of the materials (including welding materials), heat treatment temperature, chemical composition and mechanical properties at room temperature, so to solve the problem that the directly connected dissimilar steel joints could not be heat treated. The welding and heat treatment processes of 12Cr2Mo1VR/20MnMoNb dissimilar steel weld are proposed as follows based on experimental analysis: First, the F62P0-EB2R-B2R transition layer is surfacing on the 12Cr2Mo1VR groove surface, and the surfacing layer is heat-treated at (690±10) ℃, then the surfacing layer and the 20MnMoNb steel are butted with F69P0-H10Mn2NiMoA welding material and treated at (660±10) ℃. Or both sides of the butt weld are treated at different temperatures: the surfacing layer side is treated at (660±10) ℃(or (665±15) ℃) and the tube sheet side is treated at (620±10) ℃(or (620±15) ℃).

Key words: auxiliary equipment of power plant, 12Cr2Mo1VR steel, 20MnMoNb steel, dissimilar steel joint, welding process, heat treatment process

CLC Number:

TG406

Yin Runbang, Lin Baosen, Mo Qipeng, Li Zhiwei, Zheng Zhou, Tan Hong, Chen Jianbin, Wang Jiongming. Welding and heat treatment process of 12Cr2Mo1VR/20MnMoNb dissimilar steel joint in auxiliary equipment of power plant[J]. Heat Treatment of Metals, 2021, 46(10): 155-162.

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