GB/T 13401-2025 Steel buttwelding piping fittings - Technical specification English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS 13.220.10
CCS H 57
National Standard of the People's Republic of China
GB/T 13401-2025
Replaces GB/T 13401-2017
Steel buttwelding piping fittings - Technical specification
钢制对焊管件 技术规范
Issue date: 2025-10-31 Implementation date: 2026-05-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Order content
5 Materials
6 Manufacturing
7 Heat treatment
8 Inspection and testing
9 Welding repair
10 Surface protection and packaging
11 Product quality certificate
Appendix A (Normative) Additional requirements
Appendix B (Informative) Common raw materials for pipe fittings
References
1 Scope
This document specifies the technical requirements for ordering content, materials, manufacturing, heat treatment, inspection and testing, welding repair, surface protection and packaging, and product quality certificate of steel butt-welding pipe fittings.
This document applies to the pipe fittings specified in GB/T 12459, while other pipeline accessories may be used by reference.
2 Normative references
The contents of the following documents, through normative references in this text, constitute indispensable clauses of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including all amendments) applies.
GB/T 222 - Permissible Tolerances for Product Chemical Composition of Steel
GB/T 223 (all parts) - Iron and Steel - Methods for Chemical Analysis
GB/T 228.1 - Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature
GB/T 228.2 - Metallic Materials - Tensile Testing - Part 2: Method of Test at Elevated Temperature
GB/T 229 - Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 231.1 - Metallic Materials - Brinell Hardness Test - Part 1: Test Method
GB/T 2975 - Steel and Steel Products - Location and Preparation of Samples and Specimens for Mechanical Testing
GB/T 4334 - Corrosion of Metals and Alloys - Test Method for Intergranular Corrosion of Austenitic and Ferritic-Austenitic (Duplex) Stainless Steel
GB/T 4336 - Carbon and Low-alloy Steel - Determination of Multi-element Contents - Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 6394 - Metal Average Grain Size Measurement Method
GB/T 9452 - Method for Determination of the Effective Heating Zone of Heat Treatment Furnaces
GB/T 10561 - Steel - Micrographic Determination of the Non-metallic Inclusion Content - Standard Diagrams
GB/T 11170 - Stainless Steel - Determination of Multi-element Contents - Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 12459 - Steel Butt-Welding Pipe Fittings - Types and Parameters
GB/T 13305 - Method for Determination of Alpha-phase Content in Stainless Steel
GB/T 14383 - Forged Steel Socket-Welding and Threaded Pipe Fittings
GB/T 17394.1 - Metallic Materials - Leeb Hardness Test - Part 1: Test Method
GB/T 18253-2018 - Steel and Steel Products - Types of Inspection Documents
GB/T 20123 - Steel and Iron - Determination of Total Carbon and Sulfur Content - High-frequency Induction Furnace Combustion-Infrared Absorption Method (Conventional Method)
GB/T 20124 - Steel and Iron - Determination of Nitrogen Content - Inert Gas Fusion-Thermal Conductivity Method (Conventional Method)
GB/T 20125 - Low-alloy Steel - Determination of Multi-elements - Inductively Coupled Plasma Atomic Emission Spectrometry
NB/T 47013.2 - Nondestructive Testing of Pressure Equipment - Part 2: Radiographic Testing
NB/T 47013.3 - Nondestructive Testing of Pressure Equipment - Part 3: Ultrasonic Testing
NB/T 47013.4 - Nondestructive Testing of Pressure Equipment - Part 4: Magnetic Particle Testing
NB/T 47013.5 - Nondestructive Testing of Pressure Equipment - Part 5: Penetrant Testing
NB/T 47014 - Welding Procedure Qualification for Pressure Equipment
NB/T 47015 - Welding Regulations for Pressure Vessels
3 Terms and definitions
There are no terms and definitions that need to be defined in this document.
4 Order content
The purchaser shall provide the following information required for purchasing steel butt-welding pipe fittings (hereinafter referred to as pipe fittings) in the order:
a) Variety, type or designation of pipe fittings;
b) Material grade of pipe fittings (see Chapter 5);
c) Nominal size and nominal wall thickness (when Series II of GB/T 12459 is selected, it shall be marked with "-II";
d) Structure, seamless or welded (if not specified, it will be chosen by the manufacturer from any available type;
e) Product standard number, GB/T 12459 and GB/T 13401 (including version number);
f) Number of pieces;
g) Required additional requirements (see Appendix A);
h) Other supplementary provisions.
5 Materials
5.1 The raw materials used for manufacturing pipe fittings should be seamless tubes, longitudinally electric resistance welded tubes, and plates. Their common chemical composition shall comply with the provisions of Table 1. When raw materials are bars and forgings, their chemical composition shall comply with the corresponding provisions of GB/T 14383. The manufacturer shall conduct chemical composition analysis of the raw materials used according to the heat number. The analysis method shall be carried out in accordance with the provisions of GB/T 223 (all parts) or the analytical methods specified in GB/T 4336, GB/T 11170, GB/T 20123, GB/T 20124 or GB/T 20125 for determining their chemical composition, and the permissible variations in the chemical composition of the raw materials used shall comply with the provisions of GB/T 222.
5.2 The meanings represented by the material grade designations for pipe fittings are as follows:
a) CF is the abbreviation for carbon steel fitting, with the following digits indicating the minimum tensile strength of the pipe fitting; the suffix letter K indicates that this grade requires impact test qualification at 20°C;
b) AF is the abbreviation for alloy steel fitting, with the following digits adopting characteristic numbers familiar within the industry; the suffix letter G indicates that this grade has higher tensle properties;
c) LF is the abbreviation for low temperature steel fitting, with the following digits indicating the minimum tensile strength of the pipe fitting; the suffix letters K1, K2, K3 and K4 respectively represent the minimum use temperatures of -20°C, -46°C, -104°C and -196°C;
d) SF is the abbreviation for stainless steel fitting, with the following digits adopting characteristic numbers familiar within the industry; the suffix letters L and H respectively represent lower and higher carbon content; the suffix chemical element symbol indicates that its content is restricted.
