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Standards GB - Chinese national standards - Page 7043
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 23-1976
WITHDRAWN
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Bolts, small hexagon head with hole through the shank
WITHDRAWN published on 13.10.1976
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GB/T 230-1991
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Metallic materials—Rockwell hardness test
WITHDRAWN published on 31.12.1963
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GB/T 230.1-2004
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Metallic Rockwell hardness test—Part1:Test method(scales ABCDEFGHKNT)
WITHDRAWN published on 9.5.2004
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GB/T 230.1-2009
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Metallic materials—Rockwell hardness test—Part 1:Test method(scales ABCDEFGHKNT)
WITHDRAWN published on 25.6.2009
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GB/T 230.2-2002
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Metallic rockwell hardness test—Part 2:Verification and calibration of hardness testers(scales A,B,C,D,E,F,G,H,K,N,T)
WITHDRAWN published on 25.11.2002
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GB/T 230.2-2012
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Metallic materials—Rockwell hardness test—Part 2:Verification and calibration of testing machines
WITHDRAWN published on 31.12.2012
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GB/T 230.3-2002
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Metallic rockwell hardness test—Part 3:Calibration of hardness reference blocks(scales A,B,C,D,E,F,G,H,K,N,T)
WITHDRAWN published on 25.11.2002
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GB/T 230.3-2012
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Metallic materials—Rockwell hardness test—Part 3:Calibration of reference blocks(scales A,B,C,D,E,F,G,H,K,N,T)
WITHDRAWN published on 31.12.2012
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GB 2300-1980
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Very pure 30% hydrogen peroxide
WITHDRAWN published on 1.1.1980
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GB 2301-1980
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Very pure ammonium fluoride
WITHDRAWN published on 1.1.1980
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