Applicability of Heated Band Width Recommended by Post Weld Heat Treatment Standards for New 9%Cr Steel Pipes

doi:10.11930/j.issn.1004-9649.201703014

Abstract

Abstract: Four domestic and aboard post weld heat treatment (PWHT) standards for 9% Cr steel pipes are compared and the applicability of these standards is investigated based on field trials of two typical specifications of power plant 9% Cr steel pipes. The results show that there are large differences in heated band width requirement under different standards. For thin-wall 9% Cr steel pipes, Chinese, EU and US standards are appropriate. However, guideline from Huaneng is too strict in this case. All four standards cannot meet stringent requirements of temperature difference for thick-wall 9% Cr steel pipes. It is necessary to improve existing PWHT standards to guide on-site installation of 9% Cr steel pipes.

Key words: thermal power unit, 9%Cr steel, post weld heat treatment, heated band width, temperature field

CLC Number:

TM621

CHEN Dongxu, HU Lei, WANG Xue, SUN Jianhua, SUN Songtao, GUO Meihua. Applicability of Heated Band Width Recommended by Post Weld Heat Treatment Standards for New 9%Cr Steel Pipes[J]. Electric Power, 2017, 50(11): 78-83.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201703014

https://www.electricpower.com.cn/EN/Y2017/V50/I11/78

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