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Standards GB - Chinese national standards - Page 7057
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 223.2-1981
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Determination of sulphur content in ironsteeland alloy
WITHDRAWN published on 7.6.1981
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GB 223.20-1982
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Chemical analysis of iron, steel and alloy--The determination of cobalt by the potentiometric titration method
WITHDRAWN published on 1.1.1982
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GB 223.21-1982
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Chemical analysis of iron, steel and alloy--The determination of cobalt by the 5-Cl-PADAB photometric method
WITHDRAWN published on 1.1.1982
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GB 223.22-1982
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Chemical analysis of iron, steel and alloy--The determination of cobalt by the nitroso-R salt photometric method
WITHDRAWN published on 1.1.1982
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GB 223.23-1982
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Chemical analysis of iron, steel and alloy--The determination of nickel by dimethylglyoxime photometric method
WITHDRAWN published on 1.1.1982
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GB/T 223.23-1994
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Methods for chemical analysis of iron, steel and alloy—The dimethylglyoxime spectrophotometric method for the determination of nickel content
WITHDRAWN published on 17.1.1994
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GB 223.24-1982
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Chemical analysis of iron, steel and alloy--The determination of nickel by the dimethylglyoxime-trichloromethane extraction photometric method
WITHDRAWN published on 1.1.1982
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GB/T 223.24-1994
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Methods for chemical analysis of iron, steel and alloy The extraction separation—The dimethylglyoxime spectrophotometric method for the determination of nickel content
WITHDRAWN published on 17.1.1994
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GB 223.25-1984
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Methods for chemical analysis of iron, steel and alloy--The dimethylglyoxime gravimetric method for the determination of nickel content
WITHDRAWN published on 1.1.1984
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GB/T 223.26-1989
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Methods for chemical analysis of iron, steel and alloy The thiocyanate direct photometric method for the determination of molybdenum content
WITHDRAWN published on 31.3.1989
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