GB/T 228.4-2019: Metallic materials -- Tensile testing -- Part 4: Method of test in liquid helium

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Scope

This Part of GB/T 228 specifies the principle, definitions, symbols and
designations, test pieces and their dimensions measurement, apparatus,
testing conditions, determination of properties, and test report for the method of
tensile testing of metallic materials in liquid helium temperature (the boiling
point is –269 °C or 4.2 K, designated as 4 K).
This Part applies to the determination of the tensile properties of metallic
materials in liquid helium temperature. This Part may apply also to tensile
testing at cryogenic temperatures (less than –196 °C or 77 K), which requires
special apparatus, smaller test pieces, and concern for serrated yielding,
adiabatic heating, and strain-rate effects.
Note: The boiling point of the rare 3He isotope is 3.2 K. Usually, the tests are performed in
4He or a mixture of 3He and 4He with a high concentration of 4He. Therefore, the
temperature is, as designated before, 4 K.

Basic Data

Standard ID	GB/T 228.4-2019 (GB/T228.4-2019)
Description (Translated English)	Metallic materials -- Tensile testing -- Part 4: Method of test in liquid helium
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H22
Classification of International Standard	77.040.10
Word Count Estimation	14,119
Date of Issue	2019-08-30
Date of Implementation	2020-07-01
Older Standard (superseded by this standard)	GB/T 24584-2009
Quoted Standard	GB/T 228.1-2010; GB/T 228.3; GB/T 12160; GB/T 16825.1; GB/T 34104
Adopted Standard	ISO 6892-4-2015, MOD
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration
Summary	This standard specifies the principles, definitions, symbols and descriptions, test specimens and their dimensional measurements, test equipment, and test requirements for the tensile test method for metallic materials at the temperature of liquid helium (boiling point is -269��C or 4.2K, designated as 4K). , performance measurement and test report. This standard applies to the determination of the tensile properties of metallic materials at liquid helium temperature. It is also suitable for low temperature (temperature less than -196��C or 77K) tensile tests that require special equipment, smaller specimens, and involving zigzag yielding, adiabatic heating and strain rate effects.