Standards GB - Chinese national standards - Page 6153

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GB/T 223.7-1981 WITHDRAWN

Determination of iron content in alloy and powder

WITHDRAWN published on 7.6.1981

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GB/T 223.70-1989 WITHDRAWN

Methods for chemical analysis of iron, steel and alloy—The o-phenanthroline spectrophotometric method for the determination of iron content

WITHDRAWN published on 31.3.1989

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GB/T 223.72-1991 WITHDRAWN

Methods for chemical analysis of iron, steel and alloy—The alumina chromatographic separation-barium sulfate gravimetric method for the determination of sulphur content

WITHDRAWN published on 6.9.1991

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GB/T 223.73-1991 WITHDRAWN

Methods for chemical analysis of iron, steel and alloy—The titanium trichloride-potassium dichromate volumetric method for the determination of iron content

WITHDRAWN published on 6.9.1991

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