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GB/T 39077-2024: Test methods for detecting detrimental phase in austenitic-ferritic(duplex) stainless steels
Status: Valid GB/T 39077: Evolution and historical versions
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| GB/T 39077-2024 | English | 679 |
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Test methods for detecting detrimental phase in austenitic-ferritic(duplex) stainless steels
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GB/T 39077-2024
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| GB/T 39077-2020 | English | 355 |
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Test methods for detecting detrimental phase in lean duplex austenitic-ferritic stainless steels
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GB/T 39077-2020
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Basic data | Standard ID | GB/T 39077-2024 (GB/T39077-2024) | | Description (Translated English) | Test methods for detecting detrimental phase in austenitic-ferritic(duplex) stainless steels | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H40 | | Classification of International Standard | 75.180.01 | | Word Count Estimation | 34,361 | | Date of Issue | 2024-07-24 | | Date of Implementation | 2025-02-01 | | Older Standard (superseded by this standard) | GB/T 39077-2020 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 39077-2024: Test methods for detecting detrimental phase in austenitic-ferritic(duplex) stainless steels
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GB/T 39077-2024 English version. Test methods for detecting detrimental phase in austenitic-ferritic(duplex) stainless steels
ICS 75.180.01
CCSH40
National Standard of the People's Republic of China
Replace GB/T 39077-2020
Harmful phases in austenite-ferrite (duplex) stainless steel
Detection Methods
(duplex)stainless steels
Released on 2024-07-24
2025-02-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 39077-2020 "Detection method for harmful phases in economical austenitic-ferritic duplex stainless steel" and
Compared with GB/T 39077-2020, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The terms and definitions have been changed (see Chapter 3, Chapter 3 of the 2020 edition);
b) Added sampling requirements for large-section products, flanges, and welded joints (see Chapter 4);
c) Added “electrolytic etching reagents and electrolytic parameters” in the microstructure examination method (see 5.2.3);
d) Added the corrosion solution in the ferric chloride corrosion test method (see 5.4.3.2.2);
e) Added the inspection and result determination methods for harmful phases in 22Cr duplex, 25r duplex and 27Cr duplex stainless steels (see
5.2.4, 5.2.5.2, 5.3.2, 5.3.3, 5.4.4, 5.4.6).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Technical Committee on Steel Standardization (SAC/TC183).
This document was drafted by. China National Petroleum Corporation Engineering Materials Research Institute Co., Ltd., Institute of Metal Research, Chinese Academy of Sciences, Huzhou Yongxing Special
Stainless Steel Co., Ltd., Jiangsu Special Equipment Safety Supervision and Inspection Institute, China National Petroleum Corporation Southwest Oil and Gas Field Branch
Safety, Environmental Protection and Technical Supervision Research Institute, Shaanxi Special Equipment Inspection and Testing Institute, Jiangsu Rongda Material Corrosion Inspection Co., Ltd., Zhejiang
Jiangsu Special Equipment Science Research Institute, Changqing Petroleum Exploration Bureau Co., Ltd., Zhejiang Dewei Stainless Steel Pipe Co., Ltd., Ma'anshan Zunma
Technology Co., Ltd., Metallurgical Industry Information Standards Research Institute, Sinopec Engineering Construction Co., Ltd., Tianjin Steel Pipe Manufacturing Co., Ltd., Shanghai Bao
Shiwei Petroleum Steel Pipe Manufacturing Co., Ltd.
The main drafters of this document are. Tong Ke, Gai Xiuying, Cong Shen, Sun Zikai, Wu Minghua, Shen Jun, Qu Tingting, Wang Zhinan, Wang Quansheng, Ma Qiang, Huang Guogen,
Guo Siqi, Wang Jianpo, Wang Xinhe, Feng Huiwei, Yu Jiayin, Wang Jinguang, Lü Chuantao, Xu Hongzhuang, Li Yingcun, Wang Yu, Yuan Meng, Zhao Bing, Zhang Chongyuan,
Zhang Yufeng, Shi Weiqing, Jiang Limei, Zhang Chuanyou, Yan Chengming.
The previous versions of this document and the documents it replaces are as follows.
---First published in 2020 as GB/T 39077-2020;
---This is the first revision.
Harmful phases in austenite-ferrite (duplex) stainless steel
Detection Methods
1 Scope
This document specifies the test conditions, test methods and acceptance requirements for the detection of harmful phases in austenitic-ferritic (duplex) stainless steel.
The methods include microstructure inspection, Charpy impact test and ferric chloride corrosion test.
This document applies to austenitic-ferritic (duplex) stainless steel during production, manufacturing process (such as heat treatment or welding) or long-term exposure to a certain temperature.
Use the test of precipitation of harmful phases under low temperatures.
This document does not apply to conditions where the toughness and corrosion resistance of austenitic-ferritic (duplex) stainless steels are reduced due to other reasons.
Note. For the product brands that this document is mainly applicable to, please refer to Appendix A.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 229 Charpy pendulum impact test method for metallic materials (GB/T 229-2020, ISO 148-1.2016, MOD)
GB/T 2650 Destructive tests on welds of metallic materials - Impact tests (GB/T 2650-2022, ISO 9016.2022, MOD)
GB/T 13298 Metal microstructure inspection methods
GB/T 17897-2016 Corrosion of metals and alloys - Test method for pitting corrosion of stainless steel with ferric chloride
GB/T 30067 Metallographic Terminology
3 Terms and definitions
The terms and definitions defined in GB/T 30067 and the following apply to this document.
3.1 Stainless steel
3.1.1
Austenitic-ferritic (duplex) stainless steel
The matrix consists of two phases of austenite and ferrite (the content of the lesser phase is at least 25%), which can be strengthened by cold working.
Stainless steel.
Note. For the convenience of inspection, this document divides austenitic-ferritic (duplex) stainless steel into. 20Cr duplex stainless steel,...
Phase type group A (3.1.2), 20Cr duplex type group B (3.1.3), 22Cr duplex type (3.1.4), 25r duplex type (3.1.5), 27Cr duplex type (3.1.6), etc.
3.1.2
20Cr duplex group A
Austenitic-ferritic (duplex) stainless steel with a pitting resistance equivalent (3.2.1) between 24.0 and 28.0.
3.1.3
20Cr duplex group B type20CrduplexgroupB
Austenitic-ferritic (duplex) stainless steel with a pitting resistance equivalent (3.2.1) between 28.0 and 30.0.
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