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Standards GB - Chinese national standards - Page 321
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 13747.23-1992
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Zirconium and zirconium alloys--Determination of nitrogen content--Distillation-Nessler reagent spectrophotometric method
Standard published on 5.11.1992
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GB/T 13747.24-2017
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Methods for chemical analysis of zirconium and zirconium alloys—Part 24Determination of carbon content—Infrared absorption method after high frequency combustion
Standard published on 29.9.2017
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GB/T 13747.25-2017
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Methods for chemical analysis of zirconium and zirconium alloys—Part 25Determination of niobium content—2-(5-bromo-2-pyridylazo)-5-diethylam inophenol spectrophotometry and inductively coupled plasma atomic emission spectrometry
Standard published on 29.9.2017
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GB/T 13747.26-2022
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Methods for chemical analysis of zirconium and zirconium alloys—Part 26:Determination of alloying and impurity elements content—Inductively coupled plasma atomic emission spectrometry
Standard published on 30.12.2022
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GB/T 13747.27-2020
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Methods for chemical analysis of zirconium and zirconium alloys—Part 27Determination of trace impurities content—Inductively coupled plasma mass spectrometry
Standard published on 6.3.2020
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GB/T 13747.3-2020
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Methods for chemical analysis of zirconium and zirconium alloysPart 3Determination of nickel contentDimethyglyoxime spectrophotometry and inductively coupled plasma atomic emission spectrometry
Standard published on 6.3.2020
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GB/T 13747.4-2020
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Methods for chemical analysis of zirconium and zirconium alloysPart 4Determination of chromium content—Diphenylcarbazide spectrophotometry and inductively coupled plasma atomic emission spectrometry
Standard published on 6.3.2020
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GB/T 13747.5-2019
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Methods for chemical analysis of zirconium and zirconium alloys—Part 5Determination of aluminium content—Chronic azurol-S-tetradrcylpyridine chloride spectrophotometry
Standard published on 4.6.2019
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GB/T 13747.6-2019
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Methods for chemical analysis of zirconium and zirconium alloys—Part 6Determination of copper content—2,9-Dimethyl-1,10-phenanthroline spectrophotometry
Standard published on 4.6.2019
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GB/T 13747.7-2019
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Methods for chemical analysis of zirconium and zirconium alloys—Part 7Determination of manganese content—Patassium periodate spectrometry and inductively coupled plasma atomic emission spectrometry
Standard published on 31.12.2019
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