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Standards GB - Chinese national standards - Page 7068
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 223.5-1997
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Methods for chemical analysis of iron,steel and alloy—The reduced molybdosilicate spectro photometric method for the determination of acid-soluble silicon content
WITHDRAWN published on 17.3.1997
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GB 223.50-1985
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Methods for chemical analysis of iron, steel and alloy--The phenylfluorone-CTMAB direct photometric method for the determination of tin content
WITHDRAWN published on 1.1.1985
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GB/T 223.54-1987
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Methods for chemical analysis of iron,steel and alloy—The flame atomic absorption spectrophotometric method for the determination of nickel content
WITHDRAWN published on 3.4.1987
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GB/T 223.55-1987
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Methods for chemical analysis of ironsteel and alloy--The direct oscillopolarographic method for the determination of tellerium content
WITHDRAWN published on 12.5.1987
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GB/T 223.55-2008
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Iron,steel and alloy—Determination of tellurium content—Oscillo-polarographic method
WITHDRAWN published on 13.5.2008
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GB/T 223.56-1987
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Methods for chemical analysis of ironsteel and alloy--The sulfhydryl cotton fiber separation-oscillopolarographic method for the determination of tellurium content
WITHDRAWN published on 12.5.1987
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GB/T 223.57-1987
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Methods for chemical analysis of iron,steel and alloy. The extraction. Absorption catalytic polarographic method for the determination of cadmium content
WITHDRAWN published on 12.5.1987
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GB/T 223.59-1987
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Methods for chemical analysis of iron, steel and alloy—The sodium arsenite-sodium nitrite titrimetric method for the determination of phosphorus content
WITHDRAWN published on 3.4.1987
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GB 223.6-1981
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Determination of boron content in iron, steel and alloy
WITHDRAWN published on 1.1.1981
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GB/T 223.6-1994
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Methods for chemical analysis of ironsteel and alloy--The neutralization titrimetric method for the determination of boron content
WITHDRAWN published on 26.9.1994
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