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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
Indirect resistance furnaces--RX series box-type furnaces
WITHDRAWN published on 1.1.1989
Selected format:Indirect resistance furnaces--RM series box-type quenching furnaces
WITHDRAWN published on 1.1.1989
Selected format:Indirect resistance furnaces--ZR series vacuum heat-treating and brazing furnaces
WITHDRAWN published on 1.1.1989
Selected format:Indirect resistance furnaces--ZC series vacuum quenching furnaces
WITHDRAWN published on 1.1.1989
Selected format:Speed governor and oil pressure supply unit for hydraulic turbine--Terminology
WITHDRAWN published on 1.1.1989
Selected format:Specification for flushing oil system before operating steam turbine
WITHDRAWN published on 1.1.1989
Selected format:Medium and small-scale hydraulic turbines specification of components in turbine flow passages
WITHDRAWN published on 1.1.1989
Selected format:Specifications for water passage components of hydraulic turbines
WITHDRAWN published on 17.6.1996
Selected format:Specification for water passage components of hydraulic turbines,storage pumps and pump-turbines
WITHDRAWN published on 30.6.2008
Selected format:Feather keys--Types and dimensions
WITHDRAWN published on 23.6.1979
Selected format:Latest update: 2026-01-28 (Number of items: 2 257 539)
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