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GB/T 34542.2-2018 (GB/T34542.2-2018)

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GB/T 34542.2-2018English170 Add to Cart 0--10 minutes. Auto-delivery. Storage and transportation systems for gaseous hydrogen -- Part 2: Test methods for evaluating metallic material compatibility in hydrogen atmosphere GB/T 34542.2-2018 Valid GB/T 34542.2-2018


GB/T 34542.2-2018: PDF in English (GBT 34542.2-2018)
GB/T 34542.2-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.180
F 19
Storage and transportation systems for gaseous
hydrogen - Part 2. Test methods for evaluating metallic
material compatibility in hydrogen atmosphere
ISSUED ON. MAY 14, 2018
IMPLEMENTED ON. DECEMBER 01, 2018
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Symbols ... 5 
5 Test equipment ... 5 
6 Test conditions ... 7 
7 Test methods ... 8 
Annex A (informative) Basic structure of main body of test equipment ... 14 
Storage and transportation systems for gaseous
hydrogen - Part 2. Test methods for evaluating metallic
material compatibility in hydrogen atmosphere
1 Scope
This Standard specifies the test equipment, test conditions and test methods
for evaluating metallic material compatibility in hydrogen atmosphere.
This Standard is applicable to the determination of tensile properties, fatigue
properties and fracture mechanical properties of metal materials in a gaseous
hydrogen atmosphere.
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 228.1, Metallic materials - Tensile testing - Part 1. Method of test at
room temperature
GB/T 3075, Metallic materials - Fatigue testing - Axial-force-controlled
method
GB/T 3634.2, Hydrogen - Part 2. Pure hydrogen, high pure hydrogen and
ultrapure hydrogen
GB/T 6398, STANDARD test method for fatigue crack growth rates of
metallic materials
GB/T 10623, Metallic material - Mechanical testing - Vocabulary
GB/T 15248, The test method for axial loading constant-amplitude low-cycle
fatigue of metallic materials
GB/T 21143, Metallic materials - Unified method of test for determination of
quasistatic fracture toughness
GB/T 26077, Metallic materials - Fatigue testing - Axial-strain-controlled
5.1.1 See Annex A for the main body of the test equipment for evaluating
metallic material compatibility in high pressure hydrogen atmosphere. It is
mainly composed of test chamber, support equipment, measuring equipment,
loading rod, etc.
5.1.2 Test equipment shall meet the relevant safety requirements of GB/T
29729 and GB/T 34542.1.
5.1.3 The materials of 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.
5.1.4 The temperature and pressure control system of the test equipment shall
be able to meet the relevant test requirements.
5.1.5 The gas discharge system of the test equipment shall be provided with a
flow control equipment.
5.1.6 During the deactivation of the test equipment, the test chamber shall be
filled with 0.1 MPa high purity nitrogen or inert gas for protection.
5.1.7 When the test equipment is deactivated for more than 15 consecutive
days, it shall be subject to leak testing first. The test shall be carried out only
after it is qualified.
5.2 Test chamber
5.2.1 The materials, design, manufacturing, use management, periodic
inspection, etc. of test chamber shall refer to the relevant provisions of TSG 21.
5.2.2 The design of the test chamber shall take into account the effects of
fatigue loading and hydrogen on material properties.
5.2.3 The number of pressure cycles in the test chamber design must not be
lower than the number of pressure cycles within the expected service life.
5.2.4 It is advisable to use an appropriate equipment to balance the axial force
of the gas pressure on the loading rod.
5.3 Measuring equipment
5.3.1 Internal measuring equipment
5.3.1.1 The internal measuring equipment shall be able to withstand the
pressure in the test chamber and have the precision and resolution required for
the test.
5.3.1.2 The electronic components of the internal measuring equipment shall
7.2.2.1 The test shall be loaded at a constant displacement rate.
7.2.2.2 The strain rate of the gauge section of a smooth round bar sample shall
not exceed 2×10-5 s-1. For a notched round bar sample, the strain rate of the
sample segment with a notch centered at 25.4 mm shall not exceed 2×10-6 s-1.
7.2.3 Test report
The test report shall at least contain the following information.
a) Test conditions.
1) material designation, specification, chemical composition, heat
treatment state, welding process parameters (if necessary);
2) sample sampling position, sampling orientation, structural size, surface
state;
3) gas purity, test temperature, test pressure;
4) temperature-time curve, pressure-time curve of test chamber.
b) Test parameters.
strain rate.
c) Test result.
1) stress-strain curve;
2) yield strength, tensile strength, elongation after fracture and reduction
of area.
7.3 Fatigue life test
7.3.1 Test equipment and samples
7.3.1.1 Fatigue life test shall use force control or strain control. In addition to
the requirements of Clause 5, the test equipment shall also meet the relevant
requirements of GB/T 3075 when force control is adopted. When using strain
control, it shall also meet the relevant requirements of GB/T 15248 or GB/T
26077.
7.3.1.2 Fatigue life test shall use smooth round bar sample or notched round
bar sample. When using force control, the smooth round bar sample shall meet
the relevant requirements of GB/T 3075. When using strain control, the smooth
round bar sample shall meet the relevant requirements of GB/T 15248 or GB/T
26077. Samples with notched round bars shall be of standard samples as
shown in Figure 1, or samples with a notched stress concentration factor
7.4.1 Test equipment and samples
7.4.1.1 In addition to the provisions of Clause 5, the test equipment shall also
meet the relevant requirements of GB/T 21143.
7.4.1.2 The sample shall meet the relevant requirements of GB/T 21143.
7.4.2 Test procedures
7.4.2.1 The test procedures shall meet the relevant requirements of GB/T 21143.
7.4.2.2 The test shall use displacement control. Use the gap opening
displacement or the beam displacement as the control variable.
7.4.2.3 The stress intensity factor rate in the linear elastic region of the sample
shall be between 0.1 MPaꞏm1/2/min ~ 1 MPaꞏm1/2/min.
7.4.3 Test report
The test report shall at least contain the following information.
a) Test conditions.
1) material designation, specification, chemical composition, heat
treatment state, welding process parameters (if necessary);
2) sample sampling position, sampling orientation, structural size, surface
state;
3) gas purity, test temperature, test pressure;
4) temperature-time curve, pressure-time curve of test chamber.
b) Test parameters.
1) displacement rate;
2) displacement control method.
c) Test result.
fracture toughness value.
7.5 Fatigue crack growth rate test
7.5.1 Test equipment and samples
7.5.1.1 In addition to the provisions of Clause 5, the test equipment shall also
meet the relevant requirements of GB/T 6398.
......
 
(Above excerpt was released on 2018-10-05, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT34542.2-2018