GB/T 34542.3-2018Storage and transportation systems for gaseous hydrogen—Part 3: Test method for determination of the susceptibility of metallic materials to hydrogen gas embrittlement (HGE) (English PDF)

Foreword

GB/T 34542 "Storage and transportation systems for gaseous hydrogen" consists of the following parts.

- Part 1. General requirements;

- Part 2. Test methods for evaluating metallic material compatibility in hydrogen atmosphere;

- Part 3. Test method for determination of the susceptibility of metallic materials to hydrogen gas embrittlement (HGE);

- Part 4. Technical requirements for hydrogen storage system;

- Part 5. Technical requirements for hydrogen delivery system;

- Part 6. Technical requirements for hydrogen compression system;

- Part 7. Technical requirements for hydrogen filling system;

- Part 8. Technical requirements for fire and explosion protection.

This Part is Part 3 of GB/T 34542.

This Part was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This Standard specifies the general requirements, test equipment, sample requirements, test procedures, hydrogen embrittlement sensitivity evaluation and test report of determination of the susceptibility of metallic materials to hydrogen gas embrittlement.

This Standard is applicable to the evaluation of hydrogen embrittlement sensitivity of metallic materials.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 3634.2, Hydrogen - Part 2. Pure hydrogen, high pure hydrogen and ultrapure hydrogen

GB/T 4844, Pure helium, high pure helium and ultra-pure helium

GB/T 10623, Metallic material - Mechanical testing - Vocabulary

GB/T 29729, Essential requirements for the safety of hydrogen systems

GB/T 34542.1, Storage and transportation systems for gaseous hydrogen - Part 1. General requirements

3 Terms, definitions and symbols

4 General requirements

4.5 The boost rate shall be kept constant during the test. Its value shall be in the range of 0.01 MPa/min ~ 100 MPa/min.

4.6 The recommended values for the boost rate of the six helium environmental tests are 0.01 MPa/min, 0.1 MPa/min, 1 MPa/min, 10 MPa/min, 50 MPa/min and 100 MPa/min, respectively.

4.7 Nine hydrogen environmental tests are divided into two groups. The recommended values for the boost rate of the first six tests are 0.01 MPa/min, 0.1 MPa/min, 1 MPa/min, 10 MPa/min, 50 MPa/min, and 100 MPa/min.

5 Test equipment

5.1 See Annex A for the basic structure of the hydrogen embrittlement sensitivity test equipment. It is mainly composed of upper flange, lower flange, pressure ring, replacement hole, air inlet, exhaust port, etc.

5.2 The materials used in the test equipment shall meet the requirements of the corresponding national standards or industry standards. Materials in direct contact with hydrogen shall have good compatibility with hydrogen.

5.3 Test equipment shall meet the relevant safety requirements of GB/T 29729 and GB/T 34542.1.

5.4 Flow control valve shall be installed in the intake line of the test equipment.

5.5 The accuracy level of the pressure sensor in the test equipment shall not be lower than 0.25.

5.6 The upper cavity height shall be greater than or equal to 25.5 mm.

5.7 The inner diameter of the pressure ring shall be 25.5 mm. The room temperature standard tensile strength of the material shall be greater than 1100 MPa.

5.8 The flange shall be connected by 10 M10-high-strength steel bolts. When the rubber O-ring is used as the sealing element, the tightening torque is 30 N·m.

6 Sample requirements

6.1 The process of disk sample shall be the same in the hydrogen embrittlement sensitivity test. And processing shall not change material properties. […]