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GB/T 37605-2025: Welded corrosion resistant alloy pipes and tubes
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GB/T 37605: Evolution and historical versions
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| GB/T 37605-2025 | English | 279 |
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Welded corrosion resistant alloy pipes and tubes
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Basic data
| Standard ID | GB/T 37605-2025 (GB/T37605-2025) |
| Description (Translated English) | Welded corrosion resistant alloy pipes and tubes |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | H48 |
| Classification of International Standard | 77.140.75 |
| Word Count Estimation | 14,172 |
| Date of Issue | 2025-08-29 |
| Date of Implementation | 2026-03-01 |
| Older Standard (superseded by this standard) | GB/T 37605-2019, GB/T 37792-2019, GB/T 38682-2020 |
| Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China |
GB/T 37605-2025: Welded corrosion resistant alloy pipes and tubes
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT37605-2025
ICS 77.140.75
CCSH48
National Standards of the People's Republic of China
Replace GB/T 37605-2019, GB/T 37792-2019, GB/T 38682-2020
Corrosion-resistant alloy welded pipe
Published on 2025-08-29
Implemented on 2026-03-01
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
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 37605-2019 "Corrosion-resistant Alloy Welded Pipes" and GB/T 37792-2019 "General Technical Specifications for Corrosion-resistant Alloy Welded Pipes".
This document is based on GB/T 37605 and integrates the relevant standards, including GB/T 38682-2020 "Nickel-Iron-Chromium Alloy Welded Pipes for Fluid Transportation".
Compared with GB/T 37605-2019, the contents of GB/T 37792-2019 and GB/T 38682-2020 have undergone structural adjustments and editorial changes.
Aside from the changes, the main technical changes are as follows.
a) Two new designations, NS3308 and NS3313, and their related technical requirements have been added (see 6.1 and 6.2);
b) Added requirements for non-destructive testing of welded pipes with a nominal outer diameter of less than 168.3 mm (see 6.6.3).
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 by the China Iron and Steel Association.
This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This document was drafted by. Zhejiang Jiuli Special Materials Technology Co., Ltd., Shanxi Taigang Stainless Steel Pipe Co., Ltd., and Jiangsu Wujin Stainless Steel Co., Ltd.
Joint-stock company, Metallurgical Industry Information and Standardization Research Institute, Hunan Xiangtou Jintian New Materials Co., Ltd., Zhejiang Yongshang Special Materials Co., Ltd., Jiangsu
Saint-Per New Materials Technology Co., Ltd.
The main drafters of this document are. Liu Mingzhou, Luo Xia, Fang Dewei, Wang Bowen, Liu Yiming, Zhou Weiguo, Zeng Xianshan, Zhu Mingjun, Wang Lin, and Shen Yiying.
Shao Yu, Yan Chengming, Liu Tao, Yang Fan, He Yan, Peng Shengjun.
The release history of this document and the document it replaces is as follows.
---First published in.2019 as GB/T 37605-2019;
---This is the first revision, incorporating the content of GB/T 37792-2019 and GB/T 38682-2020.
Corrosion-resistant alloy welded pipe
1.Scope
This document specifies the ordering details, manufacturing process, technical requirements, inspection rules, packaging, marking, and quality certification for corrosion-resistant alloy welded pipes.
The book describes the corresponding experimental methods.
This document applies to corrosion-resistant alloy welded pipes (hereinafter referred to as welded pipes) with a nominal outer diameter not exceeding 1016 mm.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions 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 222-2025 Permissible Deviations in Chemical Composition of Steel and Alloy Finished Products
GB/T 223 (all parts) Chemical Analysis Methods for Iron and Steel and Alloys
GB/T 228.1 Metallic materials – Tensile testing – Part 1.Test method at room temperature
GB/T 228.2 Metallic materials – Tensile testing – Part 2.High temperature test method
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1.Test method
GB/T 231.1 Metallic materials – Brinell hardness test – Part 1.Test method
GB/T 241 Hydraulic test method for metal tubes
GB/T 242 Test method for flaring of metal pipes
GB/T 246 Test method for flattening of metallic tubes
GB/T 2102 Acceptance, Packaging, Marking and Quality Certificate of Steel Pipes
GB/T 2651 Tensile testing method for welded joints
GB/T 2653 Test method for bending of welded joints
GB/T 2975 Sampling Location and Specimen Preparation for Mechanical Property Testing of Steel and Steel Products
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1.Test method
GB/T 6394 Method for Determination of Average Grain Size of Metals
GB/T 5777-2019 Automatic circumferential ultrasonic testing of longitudinal and/or transverse defects in seamless and welded (excluding submerged arc welded) steel pipes
GB/T 7735-2016 Automatic eddy current testing for defects in seamless and welded (excluding submerged arc welded) steel pipes
GB/T 15260-2016 Corrosion of Metals and Alloys - Test Method for Intergranular Corrosion of Nickel Alloys
GB/T 17395 Dimensions, shape, weight and permissible deviations of steel pipes
GB/T 20066 Sampling and Sample Preparation Methods for the Determination of Chemical Composition of Steel and Iron
GB/T 20123 Determination of Total Carbon and Sulfur Content in Iron and Steel - Infrared Absorption Method After Combustion in a High-Frequency Induction Furnace (Conventional Method)
GB/T 30062 Steel Pipe Terminology
GB/T 37791 Corrosion-resistant alloy welding strips and wires
GB/T 38939 Determination of Multi-Element Content in Nickel-Based Alloys by Spark Discharge Atomic Emission Spectrometry (Conventional Method)
NB/T 47013.2-2015 Non-destructive testing of pressure equipment - Part 2.Radiographic testing
NB/T 47013.5-2015 Non-destructive testing of pressure equipment - Part 5.Penetrant testing
NB/T 47013.11-2015 Non-destructive testing of pressure equipment - Part 11.X-ray digital imaging inspection
3.Terms and Definitions
The terms and definitions defined in GB/T 30062 apply to this document.
4.Order details
Contracts or orders placed in accordance with this document should include the following.
a) This document number;
b) Product Name;
c) Trademark or Uniform Numerical Code;
d) Smelting methods;
e) Delivery status;
f) Quantity of goods delivered (total weight or total length);
g) Size specifications;
h) Special requirements (high temperature tensile testing, intergranular corrosion, etc.).
5.Manufacturing process
5.1 Smelting Method
The alloy should be smelted by ladle refining or electroslag remelting, or other smelting methods may be used. The smelting method should be specified in the quality certificate.
It is noted in the book.
5.2 Tube Manufacturing Method
5.2.1 Welded pipes shall be manufactured using the fusion welding method.
5.2.2 As agreed upon by both the supplier and the buyer, and specified in the contract, welded pipes with a nominal outer diameter of not less than 508mm are permitted to have double longitudinal seams or longitudinal welds.
Circumferential seam joints of the same quality.
5.2.3 Radiographic testing should be performed after the repair welding.
5.2.4 When it is necessary to add filler metal, the filler materials recommended in Table 1 should be used. Alternatively, filler materials with higher alloy content can be selected.
Materials shall comply with the provisions of GB/T 37791.
Table 1 Base Material and Filler Metal Materials
Serial Number
welded pipe base material
Unified Digital Code Trademark
Filler metal material
1 H08800 NS1101 HNS3106
2 H08810 NS1102
HNS3106
HNS3701a
3 H08811 NS1104
HNS3106
HNS3701a
4 H08825 NS1402 HNS3306
5 H08020 NS1403 HNS1403
Table 1.Base Material and Filler Metal Materials (continued)
Serial Number
welded pipe base material
Unified Digital Code Trademark
Filler metal material
6 H06600 NS3102 HNS3106
7 H10276 NS3304 HNS3304
8 H06625 NS3306 HNS3306
9 H06022 NS3308 HNS3308
10 H06230 NS3313 HNS3313
11 H04400 NS6400 HNS6060
The default operating temperature for the filler metal is 800°C. If the temperature exceeds 800°C, HNS3701 should be selected as needed.
5.3 Delivery Status
Welded pipes should be delivered in a heat-treated and pickled condition. Recommended heat treatment regimes are shown in Table 2.The pipes should be polished, ground, or heat-treated under a protective atmosphere.
The welded pipes do not require pickling. Alternatively, delivery in other conditions may be arranged upon mutual agreement between the supplier and the buyer.
Table 2 Recommended heat treatment regime
Unified Digital Codes. H08800 H08810 H08811 H08825 H08020 H06600 H10276
Grades NS1101 NS1102 NS1104 NS1402 NS1403 NS3102 NS3304
Recommended heat treatment regime
≥1040℃,
rapid cooling
≥1120℃,
rapid cooling
≥1150℃,
rapid cooling
930℃~
980℃
rapid cooling
930℃~
1010℃,
rapid cooling
980℃~
1010℃,
rapid cooling
≥1120℃,
rapid cooling
Unified Digital Codes. H06625 H06022 H06230 H04400
Grades NS3306, NS3308, NS3313, NS6400
Recommended heat treatment regime
Solution treatment.
≥1090℃,
rapid cooling
Annealing treatment.
≥870℃,
rapid cooling
≥1121℃,
rapid cooling
1180℃~
1250℃,
rapid cooling
Annealing treatment.
D≤127mm,
900℃~
930℃
rapid cooling
Annealing treatment.
D >127mm
900℃~
930℃
rapid cooling
Stress relief treatment.
540℃~
565℃
rapid cooling
6.Technical Requirements
6.1 Grade and Chemical Composition
6.1.1 The alloy grade and chemical composition shall conform to the specifications in Table 3.Upon request from the purchaser and consultation between the supplier and the purchaser, alloys other than those listed in Table 2 may be supplied.
No. 1 welded pipe.
6.1.2 The permissible deviation of the chemical composition of the finished welded pipe shall conform to the provisions of Table 4 in GB/T 222-2025.
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