GB/T 13401-2025 PDF English
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GB/T 13401: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 13401-2025 | 560 | Add to Cart | Auto, 9 seconds. | Steel buttwelding piping fittings - Technical specification | Valid |
| GB/T 13401-2017 | 315 | Add to Cart | Auto, 9 seconds. | Steel buttwelding pipe fittings - Technical specification | Valid |
| GB/T 13401-2005 | 949 | Add to Cart | 6 days | Steel plate butt-welding pipe fittings | Valid |
| GB/T 13401-1992 | 839 | Add to Cart | 6 days | Steel plate butt-welding pipe fittings | Obsolete |
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GB/T 13401-2025: Steel buttwelding piping fittings - Technical specification
---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/GBT13401-2025GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.040.60 CCS J 15 Replacing GB/T 13401-2017 Steel Buttwelding Piping Fittings - Technical Specification Issued on: OCTOBER 31, 2025 Implemented on: MAY 1, 2026 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 6 4 Order Details... 6 5 Materials... 7 6 Manufacturing... 11 7 Heat Treatment... 13 8 Inspection and Testing... 15 9 Welding Repair... 23 10 Surface Protection and Packaging... 23 11 Product Quality Certificate... 24 Appendix A (normative) Additional Requirements... 25 Appendix B (informative) Commonly Used Raw Materials for Pipe Fittings... 27 Bibliography... 31 Steel Buttwelding Piping Fittings - Technical Specification1 Scope
This document specifies the technical requirements for steel buttwelding piping fittings, including order details, materials, manufacturing, heat treatment, inspection and testing, weld repair, surface protection, packaging and product quality certification, etc. This document applies to pipe fittings specified in GB/T 12459.Other pipeline fittings may refer to this document for further information.2 Normative References
The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products GB/T 223 (all parts) Iron, Steel and Alloy 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 Test Pieces for Mechanical Testing GB/T 4334 Corrosion of Metals and Alloys - Test Methods for Intergranular Corrosion of Austenitic and Ferritic-austenitic (duplex) Stainless Steels GB/T 4336 Carbon and Low-alloy Steel - Determination of Multi-element Contents - Spark Discharge Atomic Emission Spectrometric Method (routine method) GB/T 6394 Determination of Estimating the Average Grain Size of Metal GB/T 9452 Testing Method for Working Zone of Heat Treatment Furnace GB/T 10561 Determination of Content of Nonmetallic Inclusions in Steel - Micrographic Method Using Standard Diagrams GB/T 11170 Stainless Steel - Determination of Multi-element Contents - Spark Discharge Atomic Emission Spectrometric Method (routine method) GB/T 12459 Steel Buttwelding Piping Fittings - Types and Parameters GB/T 13305 Method for Determining Content of the -phase in Stainless Steels GB/T 14383 Forged Fittings, Socket-welding and Threaded 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 - Infrared Absorption Method after Combustion in an Induction Furnace GB/T 20124 Steel and Iron - Determination of Nitrogen Content - Thermal Conductimetric Method after Fusion in a Current of Inert Gas (routine method) GB/T 20125 Low-alloy Steel - Determination of Multi-element Contents - Inductively Coupled Plasma Atomic Emission Spectrometric Method GB/T 20801.2 Pressure Piping Code - Industrial Piping - Part 2.Materials 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 Specification for Pressure Vessels3 Terms and Definitions
This document does not have terms or definitions that need to be defined.4 Order Details
The demand-side shall provide the following information in the order for the procurement of steel buttwelding piping fittings (hereinafter referred to as the pipe fittings). a) Variety, type or code of the pipe fittings; b) Material grade of the pipe fittings (see Chapter 5); c) Nominal size and nominal wall thickness (standard or specified; when the outer diameter is selected from GB/T 12459 Series II, it shall be marked “-II”); d) Structure, seamless or welded (if not specified, the manufacturer may choose either); e) Product standard number, GB/T 12459 and GB/T 13401 (including version number); f) Quantity; g) Any additional requirements (see Appendix A); h) Other supplementary provisions.5 Materials
5.1 The raw materials for manufacturing the pipe fittings should preferably be seamless pipes, straight seam electrofusion welded pipes, and plates, and their commonly used chemical compositions shall conform to the provisions of Table 1.When the raw materials are bars and forgings, their chemical compositions shall conform to the relevant provisions of GB/T 14383. The manufacturer shall conduct chemical composition analysis on all raw materials used, in accordance with the furnace number, using methods conforming to the provisions of GB/T 223 (all parts) or GB/T 4336, GB/T 11170, GB/T 20123, GB/T 20124 or GB/T 20125.The permissible deviations in the chemical composition of the raw materials used shall comply with the provisions of GB/T 222. 5.2 The material grade codes for the pipe fittings represent the following. a) CF is an abbreviation for carbon steel fitting; the following figure indicates the minimum tensile strength of the pipe fitting; the suffix letter K indicates that this grade must pass the impact test at 20 C; b) AF is an abbreviation for alloy steel fitting; the following figure uses characteristic numbers familiar in the industry; the suffix letter G indicates that this grade has relatively high tensile properties; c) LF is an abbreviation for low temperature steel fitting; the following figure indicates the minimum tensile strength of the pipe fitting; the suffix letters K1, K2, K3 and K4 respectively represent minimum operating temperatures of -20 C, -46 C, -104 C and -196 C; d) SF is an abbreviation for stainless steel fitting; the following figure uses characteristic numbers familiar in the industry; the suffix letters L and H respectively represent relatively low and high carbon contents; the chemical element symbols in the suffix indicate that their contents are limited. 5.3 Commonly used raw materials for manufacturing pipe fittings are listed in Appendix B. Although this document does not restrict the use of raw materials other than those in Appendix B, the raw materials used shall comply with the requirements of GB/T 20801.2 or relevant specifications, and structural steel pipes shall not be used to manufacture pipe fittings. 5.4 For welded pipe fittings manufactured from plates, the welding materials used shall be selected in accordance with NB/T 47015 or relevant specifications. For stainless steel welded pipe fittings, a chemical composition analysis shall be performed on the weld metal based on the welding material batch number; the chemical composition of the weld metal shall meet the limits specified for the material grade or the limits specified in the welding material specifications, or be between the maximum value specified in one limit and the minimum value specified in another. 5.5 For pipe fittings made of austenitic stainless steel, orders or supplies may be made in accordance with dual-marking material grades, such as SF304/SF304L, SF304/SF304H, SF316/SF316L, SF316/SF316H, SF317/SF317L, SF321/SF321H, SF347/SF347H and SF348/SF348H. In this case, the pipe fittings shall meet the chemical composition and mechanical property requirements of each material grade.6 Manufacturing
6.1 The pipe fittings may be formed by one or a combination of methods, such as extrusion, push forming, molding, drawing, forging, welding or machining. 6.2 Hollow circular pipe fittings with a nominal size less than or equal to DN100 may be directly machined from bar stock, with their axial direction approximately parallel to the direction of the metal fibers of the material; however, elbows, tees, and crosses shall not be directly machined from bar stock. 6.3 Welded pipe fittings whose welding process is completed by the manufacturer shall meet the following conditions. a) Welding procedure qualification shall be performed in accordance with NB/T 47014 or relevant specifications; b) Welding procedure specifications shall be developed in accordance with NB/T 47015 or relevant specifications; c) All welding work shall be completed by welders who have passed the relevant examinations and obtained the corresponding welding qualifications, in accordance with the welding procedure specifications; d) Heat treatment shall be performed in accordance with the provisions of Chapter 7; e) Radiographic inspection shall be performed in accordance with the provisions of 8.3.3. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
