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| GB/T 12459-2025 | English | 1479 |
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Steel buttwelding piping fittings - Types and parameters
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| GB/T 12459-2017 | English | 819 |
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Steel buttwelding pipe fittings -- Types and parameter
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| GB/T 12459-2005 | English | 135 |
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Steel butt-welding seamless pipe fittings
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| GB/T 12459-1990 | English | RFQ |
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Steel butt-welding seamless pipe fittings
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Basic data | Standard ID | GB/T 12459-2025 (GB/T12459-2025) | | Description (Translated English) | Steel buttwelding piping fittings - Types and parameters | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J15 | | Classification of International Standard | 23.040.60 | | Word Count Estimation | 74,776 | | Date of Issue | 2025-10-31 | | Date of Implementation | 2026-05-01 | | Older Standard (superseded by this standard) | GB/T 12459-2017 | | Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China | GB/T 12459-2025: Steel buttwelding piping fittings - Types and parameters---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 23.040.60
CCSJ15
National Standards of the People's Republic of China
Replaces GB/T 12459-2017
Types and parameters of steel butt-welded pipe fittings
Published on 2025-10-31
Implemented on May 1, 2026
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 1
4.Types and Codes 1
5.Pressure design of pipe fittings 2
6.Pipe fitting dimensions 2
7 Surface profile 31
8 End bevel 31
9 Tolerance 32
10 Mark 35
11 Product Quality Certificate 36
Appendix A (Normative) Design Verification Test 37
Appendix B (Normative) Pipe Fitting Design Calculation 41
References 68
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 12459-2017 "Types and Parameters of Forged Butt-Welded Pipe Fittings". Compared with GB/T 12459-2017, except for the following.
Aside from the logical changes, the main technical changes are as follows.
a) Added descriptions of key parts of the pipe fittings (see 5.2.2);
b) Added instructions on adopting GB/T 28708 (see 6.1.2);
c) The standard sizes have been revised, and sizes for some varieties have been added (see 6.1, 5.1 in the.2017 edition);
d) Specific requirements for the flow area of pipe fittings have been added (see 6.2.1);
e) The content on wall thickness tolerance and the tolerance of newly added specifications have been added, and the geometric tolerances are listed in a separate table (see Chapter 9);
f) The content of the exception flag has been changed (see 10.4, 9.4 in the.2017 version);
g) The content of the design verification test has been changed, adding requirements for key components and for different basic shapes, different manufacturing methods, and...
Test specifications for pipe fittings of different material categories (see Appendix A, Appendix A of the.2017 edition);
h) The design calculations for pipe fittings have been revised, and the minimum wall thickness for the shoulder of reducing tees and crosses has been added (see Appendix B,.2017).
Appendix B of the edition).
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 Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Standardization of Pipeline Fittings (SAC/TC237).
This document was drafted by. Wuxi Xinfeng Pipe Industry Co., Ltd., Jiangyin Nanfang Pipe Fittings Manufacturing Co., Ltd., and China Machinery Productivity Promotion Center.
Limited Liability Company, CNPC East China Design Institute Co., Ltd., China Tianchen Engineering Co., Ltd., Yangzhou Pipe Fittings Factory Co., Ltd., Hebei Canghai Nuclear Equipment Co., Ltd.
Bei Technology Co., Ltd., Changzhou Wujin Power Pipe Fittings Co., Ltd., Zhejiang Jiuli Special Materials Technology Co., Ltd., Suzhou Yuli Pipe Industry
Limited Liability Company, Sinopec Shanghai Engineering Co., Ltd., China Huanqiu Engineering Co., Ltd. Beijing Branch, Jiangsu Zhide Pipe Industry Co., Ltd., Hebei
Huizhong Pipeline Equipment Co., Ltd., Hefei Shihua Pipe Fittings Co., Ltd., Hebei Hengtong Pipe Fittings Group Co., Ltd., Jiangsu Xingyang Pipe Industry Co., Ltd.
Limited Liability Company, Zhengzhou Wanda Heavy Industry Co., Ltd., Jiangyin Jintong Petrochemical Equipment Co., Ltd., Jiangsu Haida Pipe Fittings Group Co., Ltd., Shanghai
Feiting Pipe Manufacturing Co., Ltd., Jiangsu Fujit Pipe Industry Co., Ltd., Jiangyin Donglian High Pressure Pipe Fittings Co., Ltd., Beijing Guodian Futong Technology Development Co., Ltd.
Exhibition Limited Liability Company, Tianjin Jinding Pipeline Co., Ltd., Xuancheng Yugang Steel Industry Co., Ltd., Jiangsu Longshan Pipe Fittings Co., Ltd., CNPC Pipeline Machinery
Machinery Manufacturing Co., Ltd., Hebei Provincial Special Equipment Supervision and Inspection Institute, Jiangsu Provincial Special Equipment Safety Supervision and Inspection Institute, Yanqi Lake
Basic Manufacturing Technology Research Institute (Beijing) Co., Ltd., Hebei Xinsheng Nuclear Equipment Technology Co., Ltd., Jiangyin Longteng Pipe Fittings Co., Ltd., Cangzhou
Taichang Pipeline Equipment Co., Ltd., and Henan Xinkaiyuan Petrochemical Pipeline Co., Ltd.
This document was drafted by. Guo Shunxian, Zhang Xiujie, Liu Hongfu, Liu Jianxin, Ying Daoyan, Feng Feng, Zhu Xiaofeng, Lu Hengping, Chen Qingbiao, and Meng Qingyun.
Zang Zhiwei, Pang Dong, Zhang Xinbao, Meng Jiantao, Xu Yunfeng, Wang Liang, Chen Linyu, He Qing, Yao Minghua, Li Jian, Xu Hui, Li Naiming, Ma Yang, Cong Xiangzhou
Xin He, Zhang Xinyue, Huang Qiang, Yan Lijun, Sun Zhanyuan, Ding Chunxiong, Chen Lisu, Wang Xiaojuan, Sun Qingxuan, Yang Tao, Yang Changsheng, Song Zeyu.
This document was first published in.1990, revised for the first time in.2005, revised for the second time in.2017, and this is the third revision.
Types and parameters of steel butt-welded pipe fittings
1 Scope
This document specifies the types and codes of steel butt-welded pipe fittings ranging from DN8 to DN3400 (NPS1/4 to NPS136), as well as the pressure rating of the fittings.
Requirements for pipe dimensions, surface profile, end bevels, tolerances, markings, and product quality certificates.
This document applies to steel butt-welded seamless and welded pipe fittings. Butt-welded pipe fittings made of other metal materials can be used as a reference.
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 9124.2 Steel pipe flanges - Part 2.Class series
GB/T 13401 Technical Specification for Steel Butt-Welded Pipe Fittings
GB/T 28708 Specifications for the Selection of Dimensions of Seamless and Welded Steel Pipes for Piping Engineering
3 Terms and Definitions
This document does not contain any terms or definitions that need to be defined.
4.Types and Codes
The types and codes of steel butt-welded pipe fittings (hereinafter referred to as fittings) are shown in Table 1.
Table 1 Types and Codes of Pipe Fittings
Variety type
code name
Seamless pipe fittings and welded pipe fittings
45° elbow
Long radius 45EL W45EL
3D 45E3D W45E3D
90° elbow
Long radius 90EL W90EL
Long radius differential 90ELR W90ELR
Short radius 90ES W90ES
3D 90E3D W90E3D
180° elbow
Long radius 180EL W180EL
Short radius 180ES W180ES
Reducer (reducer)
Tongxin RC WRC
Eccentric RE WRE
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GB/T 12459-2025: Steel buttwelding piping fittings - Types and parameters
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