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Standards GB - Chinese national standards - Page 4931
Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
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GB/T 5156-2022
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Magnesium and magnesium alloy extruded profiles
Standard published on 9.3.2022
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GB/T 5158.1-2011
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Metallic powders - Determination of oxygen content by reduction methods - Part 1: General guidelines
Standard published on 12.5.2011
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GB/T 5158.2-2011
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Metallic powders - Determination of oxygen content by reduction methods - Part 2: Loss of mass on hydrogen reduction(hydrogen loss)
Standard published on 12.5.2011
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GB/T 5158.3-2011
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Metallic powders - Determination of oxygen content by reduction methods - Part 3: Hydrogen-reducible oxygen
Standard published on 12.5.2011
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GB/T 5158.4-2011
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Metallic powders - Determination of oxygen content by reduction methods - Part 4: Total oxygen by reduction-extraction
Standard published on 12.5.2011
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GB/T 5159-2025
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Metallic powders,excluding powders for hardmetals—Determination of dimensional changes associated with compacting and sintering
Standard published on 31.10.2025
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GB/T 5160-2002
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Metallic powders--Determination of green strength by transverse rupture of rectangular compacts
Standard published on 23.8.2002
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GB/T 5161-2025
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Metallic powder—Determination of effective density—Liquid immersion method
Standard published on 29.8.2025
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GB/T 5162-2021
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Metallic powders—Determination of tap density
Standard published on 9.3.2021
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GB/T 5163-2006
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Sintered metal materialsexcluding hardmetals - Permeable sintered metal materials - Determination of densityoil contentand open porosity
Standard published on 18.7.2006
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