Application practice of medium frequency induction heat treatment for welded joint of thick-wall P92 steel pipe

doi:10.13251/j.issn.0254-6051.2023.03.015

Abstract

Abstract: In view of the high technical requirements of post-weld heat treatment for main steam thick-wall (especially for that with wall thickness greater than 100 mm) P92 steel pipe welded joint of 1000 MW unit in thermal power plant, post-weld heat treatment of the pipe specimen was carried out for the main steam P92 steel pipe welded joint with 118 mm wall thickness of a 1000 MW secondary reheat unit by medium frequency induction heating. The results show that after the post-weld heat treatment, the microstructures of the weld and the base material are normal, and the hardness of the weld meets the standard requirements, and after further optimization of the heat treatment by appropriately reducing the heating rate and constant temperature and increasing the width of heat preservation, 121 heat-treated welded joints of the same type are one-time all qualified in the pipeline construction process. The successful application of medium frequency induction heat treatment scheme for welded joints of thick-wall P92 steel pipe can provide reference for the subsequent post-weld heat treatment of the same type of parts.

Key words: P92 steel, thick-wall pipe, quality control, medium frequency induction, post-weld heat treatment

CLC Number:

TG441.8

Zhang Jie, Zhong Yuan, Wen Zuowei, Shi Weidong, Guo Tong, Zhang Xiaowen, Luo Liangfei. Application practice of medium frequency induction heat treatment for welded joint of thick-wall P92 steel pipe[J]. Heat Treatment of Metals, 2023, 48(3): 91-95.

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