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GB/T 24981.1-2020
Test methods of rare earth long afterglow phosphors—Part 1: Determination of emission dominantpeak and chromaticity coordinates
GB/T 20975.19-2020
Methods for chemical analysis of aluminium and aluminium alloys—Part 19：Determination of zirconium content
GB/T 20975.8-2020
Methods for chemical analysis of aluminium and aluminium alloys—Part 8：Determination of zinc content
GB/T 24981.2-2020
Test methods of rare earth long afterglow phosphors—Part 2: Determination of afterglow brightness
GB/T 24523-2020
Metallic materials—Test method for rapid indentation (Brinell type) hardness testing
GB/T 20975.20-2020
Methods for chemical analysis of aluminium and aluminium alloys—Part 20：Determination of gallium content—Butyrhodamine B spectrophotometric method
GB/T 20975.15-2020
Methods for chemical analysis of aluminium and aluminium alloys—Part 15：Determination of boron content
GB/T 39292-2020
Method of sampling and sample preparation for analysis of palladium carbon wastes
GB/T 20975.34-2020
Methods for chemical analysis of aluminium and aluminium alloys—Part 34：Determination of sodium content—Flame atomic absorption spectrometric method
GB/T 20975.33-2020
Methods for chemical analysis of aluminium and aluminium alloys—Part 33：Determination of potassium content—Flame atomic absorption spectrometric method
GB/T 39330-2020
Technical specification for surface treatment of titanium alloy castings
GB/T 39314-2020
General technical directives for aluminum alloy plaster investment casting
GB/T 39251-2020
Additive manufacturing—Methods to characterize performance of metal powders
GB/T 39494-2020
Determination for coating adhesion of rare earth permanent magnetic materials for drive motor of new energy vehicle
GB/T 39285-2020
Method for chemical analysis of palladium compounds—Determination of chlorine content—Ion chromatography
GB/T 39428-2020
Steel castings by sand casting—Visual examination method of surface quality
GB/T 39534-2020
Corrosion of metals and alloys—Method for determination of the uniform corrosion rate of stainless steels and nickel based alloys in liquids
GB/T 8184-2020
Rhodium（Ⅲ） sulfate
GB/T 15159-2020
Composite material strips of precious metals and their alloys
GB/T 2968-2020
Samarium metal