GB/T 46439-2025Seamless stainless steel pipes for hydrogen powered vehicle piping (English PDF)

1 Scope

This document specifies the classification, designation, ordering details, manufacturing process, technical requirements, and testing procedures for stainless steel seamless pipes used in hydrogen fuel cell vehicle pipelines.

Testing methods, inspection rules, packaging, marking and quality certificates.

This document applies to hydrogen gas with compressed hydrogen as the working medium, a rated working pressure not exceeding 70 MPa, and a medium temperature of -40°C to 85°C.

Seamless stainless steel pipes for pipelines in new energy vehicles (passenger cars, buses, trucks and other road vehicles) (hereinafter referred to as "pipes").

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are listed below.

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 Finished Steel and Alloy Products

GB/T 223.11 Determination of Chromium Content in Iron and Steel and Alloys - Visual Titration or Potentiometric Titration

GB/T 223.25 Chemical Analysis Methods for Iron and Steel Alloys - Determination of Nickel Content by Gravimetric Method of Dimethylglyoxime

GB/T 223.28 Chemical Analysis Methods for Iron and Steel and Alloys - Determination of Molybdenum by the alpha-benzoic acid oxime 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 223.59 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 223.82 Determination of Hydrogen Content in Iron and Steel - Inert Gas Fusion-Thermal Conductivity or Infrared 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 their 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 241 Hydraulic test method for metallic tubes

GB/T 242 Test method for flaring of metal pipes

GB/T 246 Test method for flattening of metallic tubes

GB/T 1031 Product Geometric Specification (GPS) - Surface Roughness Parameters and Their Values Using the Surface Structure Profile Method

GB/T 2102 Acceptance, Packaging, Marking and Quality Certificate of Steel Pipes

GB/T 2423.17 Environmental testing - Part 2.Test methods - Test Ka. Salt spray

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 Testing of Austenitic and Ferritic-Austenitic (Duplex) Stainless Steel method

GB/T 5777 Automatic full-circumferential ultrasonic testing of longitudinal and/or transverse defects in seamless and welded (excluding submerged arc welded) steel pipes

GB/T 6394 Method for Determination of Average Grain Size of Metals

GB/T 7735 Automatic eddy current testing for defects in seamless and welded (excluding submerged arc welded) steel pipes

GB/T 10561-2023 Standard rating chart microscopic examination method for the determination of non-metallic inclusion content in steel

GB/T 11170 Determination of Multi-Element Content in Stainless Steel by Spark Discharge Atomic Emission Spectrometry (Conventional Method)

GB/T 47090 | GB/T 43105 | GB/T 40316 | GB/T 12772 | GB/T 46437 | […]