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GB/T 30583-2026: Specifications for post weld heat treatment of pressure equipment
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GB/T 30583-2026: Specifications for post weld heat treatment of pressure equipment

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ICS 25.200 CCSJ36 National Standards of the People's Republic of China Replaces GB/T 30583-2014 Post-weld heat treatment procedure for pressure equipment Published on 2026-01-28 Implemented on August 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III Introduction V 1.Scope 1 2 Normative References 1 3.Terms and Definitions, Symbols 1 4.Basic Processes 5.Equipment, instruments and temperature measuring instruments 11 6.Technical Preparation 13 7 Heating and temperature control 14 8.Temperature measurement 15 9.Insulation 17 10 Post-weld heat treatment report 18 11 Evaluation of heat treatment effect 18 Appendix A (Informative) Post-weld heat treatment thickness (δPWHT) Schematic diagram 20 Appendix B (Informative) Post-weld heat treatment for single-heat localized areas 26 Appendix C (Informative) Post-weld heat treatment of main and auxiliary heating areas 28 Appendix D (Normative) Method for Determining the Effective Heating Zone of a Heat Treatment Furnace 30 Appendix E (Informative) Record of Post-Weld Heat Treatment for Pressure Equipment Outside the Furnace (Table 33) Appendix F (Informative) Thermal Calculations for Localized Post-Weld Heat Treatment in the Field 36 Appendix G (Informative) Test methods for evaluating the effect of post-weld heat treatment 37 Appendix H (Informative) Post-weld heat treatment effect evaluation report (example) 44 References 46

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document supersedes GB/T 30583-2014 "Post-weld heat treatment procedure for pressure equipment". Compared with GB/T 30583-2014, except for the structural... Aside from adjustments and editorial changes, the main technical changes are as follows. a) The description of the scope of application has been changed (see Chapter 1, Chapter 1 of the.2014 edition); b) The term "local post-weld heat treatment" and its definition were added, and the terms "gradient control zone," "uniform temperature zone," and "insulation temperature zone" were modified. Definitions of "temperature" and "heat preservation time" (see 3.1.3, 3.1.4, 3.1.6~3.1.8, and 3.3 and 3.5~3.7 of the.2014 edition); c) A "symbol" has been added (see 3.2); d) The requirements for adopting research findings and engineering practice experience have been changed (see 4.1.2,.2014 version of 4.1.2); e) Increased the general limits for post-weld heat treatment temperatures of non-alloy steels, low-alloy steels, austenitic stainless steels, duplex steels, and nickel-based alloys. Value requirements (see 4.1.3); f) The description of the post-weld heat treatment temperature limits has been revised (see 4.1.4, 4.1.3 in the.2014 version); g) The requirements for personnel performing post-weld heat treatment have been changed (see 4.1.5, 4.1.6, and 4.1.4 and 4.1.6 in the.2014 version); h) The requirements for welding procedure qualification and product welding test pieces have been removed (see 4.1.5 and 4.1.7 in the.2014 version); i) Requirements for the timing and method selection of post-weld heat treatment have been added (see 4.1.7 and 4.1.8); j) The specifications for post-weld heat treatment thickness have been changed, and related illustrations have been deleted [see 4.2.4d), g)~i), and 4.2.4d (2014 version). g), h), A.5, Figure A.9, A.8, Figure A.12]; k) The requirements for localized post-weld heat treatment have been changed (see 4.3.3.1~4.3.3.3, 4.3.3.5~4.3.3.7, Appendix B,.2014 edition). 4.3.3.1~4.3.3.5, Appendix B); l) Added requirements for post-weld heat treatment of the main and auxiliary heating areas (see 4.3.3.4, Appendix C); m) Added the requirement for temporary reinforcement (see 4.3.3.8); n) Requirements for post-weld heat treatment specifications for boiler products have been added (see Table 1); o) The parameters for post-weld heat treatment of pressure vessels have been changed (see Table 2, Table 1 in the.2014 edition); p) Requirements for Fe-9B type steel weldments have been added (see 4.4.4); q) Material grades exempt from post-weld heat treatment have been removed (see 4.4.1.3 in the.2014 edition); r) Added general requirements for welded joints exempt from post-weld heat treatment (see 4.4.11); s) Post-weld heat treatment requirements for Fe-10I weldments have been added (see 4.4.5, 4.4.17); t) Added descriptions of the Fe-5B-2 base material grade and revised the post-weld heat treatment requirements for Fe-5B-2 weldments (see 4.4.1, 4.4.6). 4.4.18 (4.4.1.5 in the.2014 version); u) The heat treatment temperature requirements for quenched and tempered steel and normalized and tempered weldments have been changed (see 4.4.9, 4.4.4 in the.2014 version); v) Added recommended post-weld heat treatment temperatures for welding dissimilar steels to boiler pressure components (see Table 4); w) Added requirements for post-weld heat treatment at lower temperatures for Fe-4 and Fe-5A used in boiler products (see 4.4.12); x) The general limits for in-furnace post-weld heat treatment process parameters have been changed (see 4.4.15, 4.4.9 in the.2014 version); y) The general limits for post-weld heat treatment process parameters have been changed (see 4.4.16, 4.4.10 in the.2014 version); z) Added general requirements for heating equipment (see 5.1.1, 5.1.2); aa) The requirements for heat treatment furnaces have been changed (see 5.1.3, 5.1 in the.2014 version); ab) Added requirements for heating methods such as internal combustion, far-infrared radiation, resistance, induction, and portable gas stoves (see 5.1.4~5.1.8); ac) The requirements for temperature measuring and control instruments and measurement systems have been changed (see 5.2, 5.3-5.6 of the.2014 edition); (ad) The requirements for determining the effective heating zone of the heat treatment furnace have been changed (see 5.3, Appendix D, 5.2, 7.2.1, 7.2.2, and Appendix D in the.2014 edition). C); ae) The main contents of the in-furnace post-weld heat treatment process specification have been changed (see 6.1); af) The main contents of the post-weld heat treatment process specification outside the furnace have been changed (see 6.2); (ag) Increased requirements for thermocouple compensating wires (see Table 6); (ah) The requirements for temperature measurement points and their placement have been changed (see 8.1, 8.2, and 8.1 in the.2014 version); (a) The requirements for temperature measurement and recording have been changed (see 8.4, 8.3 in the.2014 version); aj) Added technical requirements for thermal insulation materials (see 9.1~9.4); (ak) The requirements for the number of insulation layers have been changed (see 9.5, 9.2 in the.2014 version); al) Increased the requirements for the thickness of the insulation material (see 9.7); (am) Increased requirements for internal wall insulation (see 9.8); (a) A thermal calculation method for on-site localized post-weld heat treatment has been added (see Appendix F); (ao) Added requirements for evaluating the effect of post-weld heat treatment (see Chapter 11, Appendix G, Appendix H). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed and is under the jurisdiction of the National Technical Committee on Standardization of Boilers and Pressure Vessels (SAC/TC262). This document was drafted by. China Special Equipment Inspection and Research Institute, Erzhong (Deyang) Heavy Equipment Co., Ltd., and China Petrochemical Engineering Construction Co., Ltd. Limited Liability Company, Lanzhou Lanshi Heavy Equipment Co., Ltd., Jiangsu Provincial Special Equipment Safety Supervision and Inspection Institute, China University of Petroleum (East China) Hefei General Machinery Research Institute Co., Ltd., China First Heavy Industries Group Dalian Nuclear Power & Petrochemical Co., Ltd., Harbin Boiler Works Co., Ltd., Sinopec Guangzhou Engineering Co., Ltd., CNPC East China Design Institute Co., Ltd., Maoming Gravity Petrochemical Equipment Co., Ltd., Fushun Machinery Equipment Manufacturing Co., Ltd. The company, Qingdao Haiyue Electromechanical Technology Co., Ltd., Fushun Special Equipment Supervision and Inspection Institute, Ningbo Tianyi Petrochemical Heavy Equipment Manufacturing Co., Ltd. Sinopec (Tianjin) Petrochemical Co., Ltd., Dongfang Electric Group Dongfang Boiler Co., Ltd., Shanghai Boiler Works Co., Ltd., Shandong Hao Mai Machinery Manufacturing Co., Ltd., Sinopec Engineering Quality Monitoring Co., Ltd., Shanghai Fu's Heat Treatment Engineering Co., Ltd., Shandong Tongxin Testing Engineering Co., Ltd. Cheng Co., Ltd., Jiangsu Yongda Chemical Machinery Co., Ltd., Changchun Special Equipment Inspection and Research Institute (Changchun Special Equipment Safety Monitoring Center) center). The main drafters of this document are. Li Jun, Xu Tong, Jiang Wenchun, Wang Yingjun, Ma Rongzhong, Wang Jinguang, Wang Tianxian, Yuan Jijun, Guo Guangfei, and Huang Siluo. Wu Aibing, Li Qunsheng, Hu Xihai, Xie Yuhui, Li Peiyi, Li Chunshu, Zhu Jian, Wang Ping, Gu Wenbin, Tian Youliang, Ji Fang, Zheng Zhou, Jia Shangyi, Wang Jiongxiang, Chen Yong, Li Jin, Zhang Xuetao, Hu Haibo, Zhao Xiaonan, Fu Jiaren, Zhou Rongxiang, Li Bin, Ge Zhaowen, Li Shuhan, Guo Chuanjiang. This document was first published in.2014, and this is its first revision.

Introduction

Residual stresses, unavoidable during welding, can significantly impact the structural integrity and safe operation of pressure equipment. Post-weld... Heat treatment is an effective means of eliminating residual stress from welding and improving the microstructure and properties of welded joints. Its quality directly affects the overall performance of pressure equipment. Performance and service life. As pressure equipment develops towards larger sizes and higher parameters, and operates in extreme environments such as high temperature, high pressure, and corrosion, performance and service life become increasingly important. Post-weld heat treatment has placed higher demands on the industry. Improper heat treatment can easily induce stress corrosion cracking and significantly increase the risk of equipment failure during service. The risk of failure such as creep and fatigue. To improve the standardization and scientific nature of post-weld heat treatment processes for pressure equipment and ensure its long-term service life. To ensure the reliability and service life of welding equipment, GB/T 30583 has been revised. This document further adjusts and refines the welding procedures based on the.2014 version. Post-heat treatment parameters were specified; the requirements for the width of the heating band and the gradient control band width in the post-weld heat treatment of single-heat local welding were clarified; and the main and auxiliary heating areas were proposed. The post-weld heat treatment method solves the problem of difficulties in on-site implementation caused by the excessively large heating bandwidth of large equipment. This document also specifies the post-weld heat treatment method. The testing and evaluation methods for heat treatment effects provide a technical solution for the quality control of post-weld heat treatment. This document is one of the general technical standards for the construction of pressure equipment, and includes the technical requirements to be followed during the post-weld heat treatment of pressure equipment. This document does not cover all the technical details of heat treatment for pressure equipment within its scope. This document does not restrict the actual heat treatment process from using pre-treatment methods. Advanced technical methods are permitted, but engineers must assess their reliability before adopting them to ensure they meet the requirements of this document. Regulation. Post-weld heat treatment procedure for pressure equipment

1 Scope

This document specifies the basic processes, equipment, instruments and temperature measuring instruments, technical preparation, heating, temperature control, and temperature measurement for post-weld heat treatment of pressure equipment. Requirements for operations such as heat preservation. This document applies to post-weld heat treatment of boilers and pressure vessels (excluding gas cylinders). Other pressure-bearing equipment may refer to this document for implementation.

2 Normative references

The contents of the following documents, through normative reference, constitute essential clauses of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 3375 Welding Terminology GB/T 9452 Method for determining the effective heating zone of a heat treatment furnace GB/T 4989 Compensating wires for thermocouples GB/T 4990 Alloy wire for compensating leads of thermocouples NB/T 47014 Welding Procedure Qualification for Pressure Equipment 3.Terms and definitions, symbols 3.1 Terms and Definitions The terms and definitions defined in GB/T 3375 and GB/T 9452, as well as the following terms and definitions, apply to this document. 3.1.1 weldment Welded pressure equipment or its components. 3.1.2 To eliminate residual welding stress and improve the microstructure and properties of the welded joint, the workpiece is uniformly heated to a sufficiently high temperature and maintained at a certain temperature. The process involves time, followed by uniform cooling. 3.1.3 Due to limitations in size or special structure, or reasons such as needing to repair or modify the equipment, overall heat treatment cannot be performed, and instead, localized heating is used. Post-weld heat treatment. 3.1.4 Soakband;SB During localized post-weld heat treatment, the weld seam and the strip-shaped area on both sides of the weldment reach the specified temperature range. Note. The isothermal zone generally covers at least the weld zone, the heat-affected zone, and the adjacent base material. ...