GB/T 12770: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 12770-2025 | English | 439 |
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Welded stainless steel tubes for mechanical structures
| Valid |
GB/T 12770-2025
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| GB/T 12770-2012 | English | 329 |
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Welded stainless steel tubes for mechanical structures
| Valid |
GB/T 12770-2012
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| GB/T 12770-2002 | English | 519 |
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Mechanical structure stainless steel welded pipe
| Obsolete |
GB/T 12770-2002
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| GB/T 12770-1991 | English | 439 |
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Welded stainless steel tubes for machine structure
| Obsolete |
GB/T 12770-1991
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Basic data | Standard ID | GB/T 12770-2025 (GB/T12770-2025) | | Description (Translated English) | Welded stainless steel tubes for mechanical structures | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H48 | | Classification of International Standard | 77.140.75 | | Word Count Estimation | 22,279 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 12770-2012 | | Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China | GB/T 12770-2025: Welded stainless steel tubes for mechanical structures---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/GBT12770-2025
ICS 77.140.75
CCSH48
National Standards of the People's Republic of China
Replaces GB/T 12770-2012
Stainless steel welded pipes for mechanical structures
Published on 2025-08-29
Implemented on 2026-03-01
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of Contents
Preface III
1.Scope 1
2 Normative References 1
3.Terms and Definitions 2
4.Classification and Codes 2
5.Order Details 2
6 Manufacturing process 3
7 Technical Requirements 4
8.Test Methods 13
9.Inspection Rule 14
10 Packaging, labeling, and quality certificate 14
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 replaces GB/T 12770-2012 "Stainless Steel Welded Pipes for Mechanical Structures". Compared with GB/T 12770-2012, except for the structural...
Aside from structural adjustments and editorial changes, the main technical changes are as follows.
a) The classification and code have been changed (see Chapter 4, Chapter 3 of the.2012 edition);
b) The order details have been changed (see Chapter 5, Chapter 4 in the.2012 edition);
c) The steelmaking method has been changed (see 6.1, 6.2.1 of the.2012 edition);
d) The manufacturing method of the steel pipes has been changed (see 6.2, 6.2.2 of the.2012 edition);
e) The delivery status requirements have been changed (see 6.3,.2012 version of 6.3);
f) The following grades were added. 12Cr17Mn8Ni2N, 05Cr19Mn6Ni5Cu2N, 08Cr19Mn6Ni3Cu2N, and 05Cr20Ni7Mn4N.
022Cr25Ni7Mo4WCuN, 019Cr23Mo2Ti, 019Cr23MoTi, 10Cr16Mn9Ni2Cu2N, 12Cr15Mn10Ni2N and
The relevant requirements are shown in Tables 1, 2, 3, and 6.
g) Surface condition requirements have been added (see 6.4);
h) Impact testing requirements for welded joints have been added (see 7.2.2);
i) The flattening test requirements have been changed (see 7.3.1.1, 6.5.1 in the.2012 version);
j) Added non-destructive testing requirements (see 7.4);
k) The permissible deviations for outer diameter and wall thickness have been changed (see Table 5, Tables 1 and 2 in the.2012 edition);
l) The permissible deviation for fixed length has been changed (see 7.7.2.2, 5.2.2 in the.2012 version);
m) The out-of-roundness requirements for thin-walled steel pipes have been changed (see 7.7.3, 5.3 in the.2012 edition);
n) The curvature requirements have been changed (see 7.7.4, 5.4 in the.2012 version);
o) The sampling quantity, sampling method, and test method have been changed (see Table 7, Table 8 in the.2012 edition);
p) The batching rules have been changed (see 9.2, 8.2 in the.2012 version).
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. Shanxi Taigang Stainless Steel Pipe Co., Ltd., Zhejiang Jiuli Metal Materials Research Institute Co., Ltd., and Zhejiang Jinzhou Pipe.
Dao Technology Co., Ltd., Zhejiang Dewei Stainless Steel Pipe Co., Ltd., Fujian Qingtuo Special Steel Technology Research Co., Ltd., ZTE Energy
Equipment Co., Ltd., Taiyuan University of Science and Technology, Guangzhou Yongda Stainless Steel Co., Ltd., Shandong Jinrunde New Material Technology Co., Ltd., Metallurgical Industry
Industry Information Standards Research Institute and Jiangsu Lanyue Stainless Steel Co., Ltd.
The main drafters of this document are. Wang Bowen, Wang Zhiyong, Su Cheng, Yang Weifang, Shen Chenxia, Jiang Laizhu, Qiu Yunlong, Chu Zhibing, and Cao Junjie.
Li Jiaquan, Li Qi, Dong Yabiao, Liu Mingzhou, Qian Guoqiang, Hu Senqiang, Ren Yong, Zhu Weifei, Tuo Leifeng, Yang Yungang, Niu Bo, Chen Xi, Guo Bicheng
Wang Tiantian and Ji Youhai.
This document was first published in.1991, revised for the first time in.2002, revised for the second time in.2012, and this is the third revision.
Stainless steel welded pipes for mechanical structures
1.Scope
This document specifies the classification and designation, ordering details, manufacturing process, technical requirements, and testing methods for stainless steel welded pipes used in mechanical structures.
Laws, inspection rules, packaging, marking and quality certificates.
This document applies to stainless steel welded pipes used in machinery, automobiles, rail vehicles, marine engineering, oil and gas engineering, and other structural applications (hereinafter referred to as...).
("steel pipe").
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 Permissible Deviations in Chemical Composition of Steel and Alloy Finished Products
GB/T 223.4 Determination of manganese content in iron and steel and alloys by potentiometric or visual titration method
GB/T 223.9 Determination of Aluminum Content in Iron and Steel and Alloys - Chromium Blue S Spectrophotometric Method
GB/T 223.11 Determination of Chromium Content in Iron and Steel and Alloys - Visual Titration or Potentiometric Titration
GB/T 223.18 Chemical Analysis Methods for Iron and Steel Alloys - Determination of Copper by Sodium Thiosulfate Separation-Iodometric Method
GB/T 223.19 Chemical Analysis Methods for Iron and Steel Alloys - Determination of Copper Content by Neo-Copper-Chloroform Extraction Spectrophotometric Method
GB/T 223.23 Determination of Nickel Content in Iron and Steel and Alloys - Dimethylglyoxime Spectrophotometric Method
GB/T 223.25 Chemical Analysis Methods for Iron and Steel Alloys - Determination of Nickel Content by Gravimetric Method of Dimethylglyoxime
GB/T 223.26 Determination of molybdenum content in iron and steel and their alloys - Thiocyanate spectrophotometric method
GB/T 223.28 Chemical Analysis Methods for Iron and Steel Alloys - Determination of Molybdenum by α-Benzoxime Gravimetric Method
GB/T 223.36 Chemical Analysis Methods for Iron and Steel Alloys - Determination of Nitrogen Content by Distillation Separation-Neutralization Titration
GB/T 223.37 Determination of Nitrogen Content in Iron and Steel and Alloys - Distillation Separation of Indophenol Blue Spectrophotometric Method
GB/T 223.40 Determination of Niobium Content in Iron and Steel and Alloys - Chlorsulfonylphenol S Spectrophotometric Method
GB/T 223.59 Determination of phosphorus content in iron and steel and their alloys - Bismuth-phosphomolybdenum blue spectrophotometric method and antimony-phosphomolybdenum blue spectrophotometric method
GB/T 223.60 Determination of silicon content in iron and steel and alloys by gravimetric method
GB/T 223.63 Determination of Manganese Content in Iron and Steel and Alloys - Sodium (Potassium) Periodate Spectrophotometric Method
GB/T 223.84 Determination of Titanium Content in Iron and Steel and Alloys - Diantipyrine Methane Spectrophotometric Method
GB/T 223.85 Determination of sulfur content in iron and steel and their alloys by infrared absorption method after combustion in an induction furnace
GB/T 223.86 Determination of Total Carbon Content in Iron and Steel and Alloys by Infrared Absorption Method After Combustion in an Induction Furnace
GB/T 228.1 Metallic materials – Tensile testing – Part 1.Test method at room temperature
GB/T 242 Test method for flaring of metal pipes
GB/T 245 Test method for crimping of metallic tubes
GB/T 246 Test method for flattening of metallic tubes
GB/T 2102 Acceptance, Packaging, Marking and Quality Certificate of Steel Pipes
GB/T 2650 Destructive testing of welds in metallic materials - Impact test
GB/T 2651 Destructive testing of welds in metallic materials - Transverse tensile test
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 4334-2020 Corrosion of Metals and Alloys - Intergranular Corrosion Test for Austenitic and Ferritic-Austenitic (Duplex) Stainless Steel
method
GB/T 7735 Automatic eddy current testing for defects in seamless and welded (excluding submerged arc welded) steel pipes
GB/T 11170 Determination of Multi-Element Content in Stainless Steel by Spark Discharge Atomic Emission Spectrometry (Conventional Method)
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 20124 Determination of Nitrogen Content in Iron and Steel - Inert Gas Molten Thermal Conductivity Method (Conventional Method)
GB/T 30062 Steel Pipe Terminology
GB/T 40385 Non-destructive testing of steel pipes - Digital radiographic inspection of weld defects in welded steel pipes
GB/T 40791 Non-destructive testing of steel pipes - Radiographic inspection of weld defects in welded steel pipes
YB/T 4395 Determination of molybdenum, niobium and tungsten content in steel - Inductively coupled plasma atomic emission spectrometry
YB/T 4396 Determination of Multi-Element Content in Stainless Steel by Inductively Coupled Plasma Atomic Emission Spectrometry
3.Terms and Definitions
The terms and definitions defined in GB/T 30062 apply to this document.
4.Classification and Codes
4.1 Steel pipes are classified into three categories according to their delivery condition, and their categories and codes are as follows.
a) Welding condition WW;
b) Cold-drawn (rolled) state (WC);
c) Heat treatment state T.
4.2 Steel pipes are classified into 5 categories according to their surface condition, and their categories and codes are as follows.
a) Polished SP state;
b) Polished state SB;
c) Shot peening (sandblasting) state SS;
d) Pickled state (SA);
e) Unprocessed SNB (or no code).
4.3 Steel pipes are classified into two grades according to dimensional accuracy, and their categories and codes are as follows.
a) Standard PA;
b) Advanced PC.
5.Order details
Contracts or orders for steel pipes ordered in accordance with this document shall include the following.
a) This document number;
b) Product Name;
c) Steel grade or unified numerical designation;
d) Dimensions (nominal outer diameter × nominal wall thickness, in millimeters) and accuracy class;
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