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GB/T 32566.2-2025Welded stainless steel cylinders - Part 2: Test pressure greater than 6MPa (English PDF)

不锈钢焊接气瓶第2部分：试验压力大于6MPa的气瓶

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Issued by

State Administration for Market Regulation, National Standardization Administration

Level / Type

National · Recommended

Issue date

August 29, 2025

Implementation date

March 1, 2026

Scope

GB/T 32566.2-2025 is the English-translated version of 不锈钢焊接气瓶第2部分：试验压力大于6MPa的气瓶.

GB/T 32566.2-2025 is Part 2 of GB/T 32566 and, per clause 1, specifies the minimum requirements for the materials, design, production technology, manufacturing procedures and testing of stainless steel welded gas cylinders, which it calls cylinders for short.

The same clause limits it to cylinders that can be repeatedly filled with compressed gas and liquefied gas, with a water pressure test pressure greater than 6 MPa (gauge pressure), a nominal volume of 0.5 L to 150 L and an actual tensile strength of no more than 1100 MPa, used at an ambient temperature of -40 °C to 60 °C; the introduction adds that the document does not and cannot include all the technical details for producing such cylinders within its scope of application.

The index runs from materials and heat treatment in clause 5 and design in clause 6 (calculation of bottle wall thickness, convex head design, minimum wall thickness requirements, other shapes of heads, opening design and the valve seat or plug seat) through manufacturing and process requirements in clause 7 (welding, welded joints of pressure-bearing parts, non-pressure accessories, valve protection, bottle thread and visual inspection) to the type test in clause 8, the batch test in clause 9 (tensile, bending and impact tests and macroscopic inspection of weld sections), clause 10, which the index prints as Check each one and which holds a hardness test and a leakage test, the requirements when test results are unsatisfactory in clause 11 and the product certificate and batch quality certificate in clause 13.

Appendix C is normative and covers radiographic testing of welds, Appendix D is normative and sets the assessment of manufacturing defects and the acceptance criteria during visual inspection of cylinders, while the informative Appendices A, B and E give the structure-number comparison with ISO 18172-2:2007, the list of technical differences and templates for the certificate of conformity and the batch quality certificate.

Clause 2 cites GB/T 192, GB/T 196, GB/T 197, GB/T 228.1, GB/T 229, GB/T 231.1, GB/T 232, GB/T 713.7, GB/T 4334, GB/T 5100, GB/T 8335, GB/T 9251, GB/T 9252, GB/T 12137, GB/T 13005, GB/T 14976, GB/T 15385, GB/T 17925, GB/T 19418, GB/T 33209, NB/T 47010 and NB/T 47013.2.

The document is a modified adoption of ISO 18172-2:2007, and its foreword records among the changes that the pressure unit was unified to MPa with the wall thickness calculation formula changed accordingly, that the new design test was described as a type test to match China's safety technical regulations, and that the number of pressure cycle test bottles was fixed at three.

It was proposed and is coordinated by the National Technical Committee for Standardization of Gas Cylinders (SAC/TC31), and the draft breaks off at the end of clause 2, so no clause text after the normative references is shown.

The page records no earlier edition superseded by this part, the foreword presenting it as a new part alongside GB/T 32566-2016; it was issued on 29 August 2025 and has applied since 1 March 2026.

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Document preview — GB/T 32566.2-2025

National Standard of the People's Republic of China

ICS: 23.020.30
Classification: J 74

Issued by: State Administration for Market Regulation, National Standardization Administration

Preface
Introduction
1 Scope
2 Normative references
3 Terms and Definitions
4 Symbols and instructions
5 Materials and Heat Treatment
5.1 General Principles
5.2 Material Category
5.3 Heat Treatment
5.4 Test requirements
6 Design
6.1 General requirements
6.2 Calculation of bottle wall thickness
6.3 Convex Head Design
6.4 Minimum wall thickness requirements
6.5 Other shapes of heads
6.6 Opening Design
6.7 Valve seat (plug seat)
7 Manufacturing and process requirements
7.1 General requirements
7.2 Welding
7.3 Welded joints of pressure-bearing parts
7.4 Non-pressure accessories
7.5 Valve Protection
7.6 Bottle thread
7.7 Visual Inspection
8 Type test
8.1 General requirements
8.2 Verification and testing
8.3 Test requirements
8.4 Type test certificate
9 Batch test
9.1 General requirements
9.2 Data
9.3 Tensile test
9.4 Bending test
9.5 Impact test
9.6 Macroscopic inspection of weld sections
9.7 Inspection and Verification
10 Check each one
10.1 Voltage test
10.2 Hardness test
10.3 Leakage test
11 Requirements when test results are unsatisfactory
12 Sign
13 Product Certificate and Batch Quality Certificate
Appendix A (Informative) Comparison table of structure numbers between this document and ISO 18172-2:2007
Appendix B (Informative) List of technical differences between this document and ISO 18172-2:2007 and their causes
Appendix C (Normative) Radiographic Testing of Welds
C.1 General requirements
C.2 Requirement
C.3 Defect Detection
Appendix D (Normative) Assessment of manufacturing defects and acceptance criteria during visual inspection of cylinders
D.1 Overview
D.2 General requirements
D.3 Manufacturing defects
D.4 Unqualified cylinders
Appendix E (Informative) Certificate of Conformity and Batch Quality Certificate Template
E.1 Certificate
E.2 Batch Quality Certificate
Reference

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is Part 2 of GB/T 32566.GB/T 32566 has published the following parts.

---Stainless steel welded gas cylinders (GB/T 32566-2016);

--- Stainless steel welded gas cylinders Part 2: Gas cylinders with test pressure greater than 6 MPa.

This document is modified to adopt ISO 18172-2:2007 "Refillable stainless steel welded gas cylinders Part 2: Test pressure greater than 6MPa". Compared with ISO 18172-2:2007, this document has many structural adjustments. See Appendix A for the table. This document has many technical differences compared to ISO 18172-2:2007.

A list of these technical differences and their reasons is given in Appendix B. The following editorial changes have been made to this document.

--- Modified the standard name;

--- Some clauses adjust the requirements in brackets in ISO 18172-2:2007 to the requirements in the clauses, that is, delete the brackets (see 5.1.2,5.3.2,6.4.3,7.2.1,7.7.2.3,8.1.1,8.2.1,9.1,9.3.2.1,9.3.3.2,Figure 5,9.5.4), improve document organization and readability;

--- After translation, some clauses in ISO 18172-2:2007 were deleted (see 5.1.3, 5.1.7, 8.3.1.2, C.2.4, D.2.1, D.2.2, D.4), to suit our language habits and expressions; consistent approach;

---ISO 18172-2 stipulates that the compatibility of material grades and gases should comply with ISO 11114-1, but ISO 11114-1 does not Therefore, the compatibility of the bottle material and the filling gas is modified in this document to refer to ISO 11114-1 (see 5.1.2);

---Delete the unit bar in other chapters, clauses and charts, unify the pressure unit to MPa, and the corresponding wall thickness calculation formula is also changed. Modified (see 6.2);

--- Describe "new design test" as "type test" (see Chapter 8), which is consistent with the requirements of my country's safety technical regulations;

--- ISO 18172-2 does not indicate the thickness of t in Figure 7, but it is indicated in Figure 8. This document uses the symbol t in the description. The reference legend is changed to Figure 8;

--- ISO 18172-2 7.2.2 and 7.3.2 specify the number of test bottles, which are inconsistent with each other. This document clarifies the number of pressure cycle test bottles. The quantity is 3 (see 8.2.2);

--- Deleted the repeated description of the location of the intergranular corrosion test specimen in ISO 18172-2:2007 (see 8.3.3);

---Because the template of type test certificate has been specified in the safety technical specification for special equipment, the type test certificate clause in this document has been deleted. Reference to informative appendix (see 8.4);

--- Corrected the incorrect description of the number of corrosion test specimens in Figure 5 of ISO 18172-2, and changed it to 2 pieces (see Figure 5, longitudinal weld, girth weld 1 each);

--- Corrected the incorrect description of the reference clause in the reference number explanation 3 of Figure 5 of ISO 18172-2.The referenced clause is weld tensile strength Test and relevant provisions of weld bend test (see Figure 5);

--- Corrected the text error in ISO 18172-2 regarding the cylinder diameter range applicable to longitudinal impact test specimens (see 9.5.6).

Introduction

In order to adapt to the development of socialist market economy, implement the grand goal of the "One Belt and One Road" construction, expand international trade, and improve our

GB/T 32566 series of standards adopts ISO 18172 in accordance with the modification.

By converting ISO standards, my country can develop various low-pressure and high-pressure non-conductive products at a relatively fast pace.

Stainless steel welded gas cylinders contribute to the development of my country's industry.

GB/T 32566 "Stainless Steel Welded Gas Cylinders" is intended to be divided into the following two parts.

--- Part 1: Cylinders with a test pressure less than or equal to 6 MPa. The purpose is to provide Requirements for the design, manufacture and inspection of stainless steel welded gas cylinders. This part is drafted based on ISO 18172-1:2007 and replaces

GB/T 32566-2016 "Stainless steel welded gas cylinders";

--- Part 2: Gas cylinders with test pressure greater than 6 MPa. The purpose is to provide the test pressure greater than 6 MPa stainless steel welded gas cylinders This part is drafted based on ISO 18172-2:2007.

The technical provisions of this document include the technical requirements that need to be followed during the production process (i.e. design, manufacturing and inspection) of stainless steel welded gas cylinders.

This document does not necessarily, nor can it, include all technical details for the production of welded stainless steel gas cylinders within the scope of application.

1 Scope

This document specifies the minimum requirements for materials, design, production technology, manufacturing procedures and testing of stainless steel welded gas cylinders (hereinafter referred to as "cylinders"). The requirements of this.

This document is applicable to the ambient temperature of -40°C~60°C, the water pressure test pressure is greater than 6MPa (gauge pressure), the nominal volume is 0.5L~ 150L steel cylinders with an actual tensile strength of no more than 1100MPa, which can be repeatedly filled with compressed gas and liquefied gas.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document.

GB/T 192 Basic profile of common thread (GB/T 192-2003, ISO 68-1:1998, MOD)

GB/T 196 Basic Dimensions of Common Threads (GB/T 196-2025, ISO 724:2023, MOD)

GB/T 197 General thread tolerances (GB/T 197-2018, ISO 965-1:2013, MOD)

GB/T 228.1 Tensile tests on metallic materials - Part 1: Test methods at room temperature (GB/T 228.1-2021, ISO 6892-1. 2019, MOD)

GB/T 229 Metallic materials - Charpy pendulum impact test method (GB/T 229-2020, ISO 148-1:2016, MOD)

GB/T 231.1 Metallic materials Brinell hardness test Part 1: Test method (GB/T 231.1-2018, ISO 6506-1. 2014, MOD)

GB/T 232 Metallic materials - Bend test method (GB/T 232-2024, ISO 7438:2020, MOD)

GB/T 713.7 Steel plates and strips for pressure equipment Part 7: Stainless steel and heat-resistant steel

GB/T 4334 Corrosion of metals and alloys - Test method for intergranular corrosion of austenitic and ferritic-austenitic (duplex) stainless steels (GB/T 4334-2020, ISO 3651-1:1998, ISO 3651-2:1998, MOD)

GB/T 5100 Steel Welded Gas Cylinders (GB/T 5100-2020, ISO 4706:2008, NEQ)

GB/T 8335 Gas Cylinder Threads (GB/T 8335-2011, ISO 11363-1:2010, NEQ)

GB/T 9251 Gas cylinders hydrostatic test method

GB/T 9252 Gas cylinder pressure cycle test method

GB/T 12137 Test method for gas cylinder airtightness

GB/T 13005 Gas Cylinder Terminology (GB/T 13005-2011, ISO 10286:2007, NEQ)

GB/T 14976 Stainless steel seamless pipes for fluid transportation

GB/T 15385 Gas cylinder hydraulic burst test method

GB/T 17925 X-ray digital imaging inspection of butt welds of gas cylinders

GB/T 19418 Guide to quality classification of imperfections in arc-welded steel joints (GB/T 19418-2003, ISO 5817:1992, IDT)

GB/T 33209 Welding procedure assessment for welding gas cylinders

NB/T 47010 Stainless steel and heat-resistant steel forgings for pressure equipment

NB/T 47013.2 Nondestructive testing of pressure equipment Part 2: Radiographic testing

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 77 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 8335 · GB/T 13005

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