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Standards GB - Chinese national standards - Page 5224
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 7731.3-2008
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Ferrotungsten - Determination of copper content - Bis(cyclohexanone)oxalyldihydrazone photometric method and flame atomic absorption spectrometric method
Standard published on 13.5.2008
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GB/T 7731.4-2021
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Ferrotungsten—Determination of phosphorus content—Phosphorus molybdenum blue spectrophotometric method
Standard published on 20.8.2021
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GB/T 7731.5-2021
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Ferrotungsten—Determination of silicon content—Silicomolybdenum blue spectrophotometric method
Standard published on 20.8.2021
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GB/T 7731.6-2008
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Ferrotungsten - Determination of arsenic content - The molybdenum blue photometrie method and inductively coupled plasma-atomic emission spectrometry
Standard published on 19.8.2008
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GB/T 7731.7-2008
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Ferrotungsten - Determination of tin content - Phenylfluorone photometric method and inductively coupled plasma-atomic emission spectrometry
Standard published on 13.5.2008
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GB/T 7731.8-2008
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Ferrotungsten - Determination of antimony content - The tetraethylrhodamine photometrie method and inductively coupled plasma-atomic emission spectrometry
Standard published on 19.8.2008
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GB/T 7731.9-2008
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Ferrotungsten - Determination of bismuth content - The bismuth iodide photometric method and inductively coupled plasma - atomic emission spectrometry
Standard published on 19.8.2008
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GB/T 7732-2008
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Metallic materials - Fracture toughness testing method with surface crack tension specimens
Standard published on 13.5.2008
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GB/T 7734-2015
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Method for ultrasonic testing of clad steel plates
Standard published on 10.12.2015
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GB/T 7735-2016
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Automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for detection of imperfections
Standard published on 30.12.2016
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