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Standards GB - Chinese national standards - Page 7056
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 223.10-2000
WITHDRAWN
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Methods for chemical analysis of iron,steel and alloy The cupferron separation-chrome azurol S photometric method for the determination of aluminium content
WITHDRAWN published on 11.4.2000
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GB 223.11-1982
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WITHDRAWN published on 1.1.1982
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GB/T 223.11-1991
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Methods for chemical analysis of iron, steel and alloy The ammonium persulfate oxidation volumetric method for the determination of chromium content
WITHDRAWN published on 6.9.1991
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GB/T 223.11-2008
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Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
WITHDRAWN published on 11.9.2008
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GB/T 223.12-1991
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Methodsfor chemical analysis of ironsteel and alloy--The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content
WITHDRAWN published on 6.9.1991
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GB/T 223.13-2000
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Methods for chemical analysis of ironsteel and alloy--The ammonium ferrous sulfate titrationmethod for the determination of vanadium content
WITHDRAWN published on 11.4.2000
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GB/T 223.14-2000
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Methods for chemical analysis of ironsteel and alloy--The N-benzoy-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content
WITHDRAWN published on 11.4.2000
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GB/T 223.15-1982
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Chemical analysis of ironsteel and alloy--The determination of titanium by gravimetric method
WITHDRAWN published on 9.7.1982
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GB/T 223.16-1991
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Methods for chemical analysis of iron, steel and alloy—The chromotropic acid photometric method for the determination of titanium content
WITHDRAWN published on 6.9.1991
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GB 223.18-1982
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Chemical analysis of iron, steel and alloy--The determination of copper by thiosulfate-iodide method
WITHDRAWN published on 1.1.1982
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