GB/T 8320-2025 Copper-tungsten and silver-tungsten electrical contacts

GB/T 8320-2017 Copper-tungsten and silver-tungsten electrical contacts

GB/T 228.1-2010 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 228.1-2021 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 2900.4-1994 Electrotechnical terminology—Special alloys for electrical equipment GB/T 2900.4-2008 Electrotechnical terminology Special alloys for electrical equipment GB/T 4324.6-2012 Methods for chemical analysis of tungsten—Part 6:Determination of iron content—1,10-phenanthroline spectrophotometry GB/T 4324.6-1984 Methods for chemical analysisof tungsten--The ortho-phenanthroline photometric method for the determination iron content GB/T 4324.27-2012 Methods for chemical analysis of tungsten—Part 27:Determination of carbon content—High frequency combustion-infrared absorption method GB/T 4324.27-1984 Methods for chemical analysisof tungsten--The combustion-coulometric titration method for the determinationof carbon content GB/T 5121.1-1996 Copper and copper alloys—Determination of copper content GB/T 5121.1-2008 Methods for chemical analysis of copper and copper alloys—Part 1:Determination of copper content GB/T 5121.16-1996 Copper and copper alloys—Determination of chromium content GB/T 5121.16-2008 Methods for chemical analysis of copper and copper alloys—Part 16:Determination of chromium content GB/T 5121.20-1996 Copper and copper alloys—Determination of zirconium content GB/T 5121.20-2008 Methods for chemical analysis of copper and copper alloys—Part 20:Determination of zirconium content GB/T 5586-1998 Test methods for essential porperty of electric contact material GB/T 5586-2016 Test methods for essential property of electrical contact materials GB/T 5587-2003 Basic shapes,dimensions,symbols and notations of silver based electrical contacts GB/T 5587-2016 Basic shapes,dimensions,symbols and notations of silver based electrical contacts GB/T 24300-2009 Test method of flaws of Cu-W contact GB/T 24300-2025 Test method for flaws in Cu-W electrical contacts GB/T 26871-2011 Metallographic examination of electrical contact materials GB/T 26871-2024 Metallographic examination methods of the electrical contact materials GB/T 26872-2011 Metallographic atlas of electrical contact materials JB/T 4107.1-2014 Electro-contact material chemical analysis methods - Part 1: General principles and guidelines JB/T 4107.1-1999 Electro-contact material chemical analysis methods: General principles and general provisions JB/T 4107.2-2014 Electro-contact material chemical analysis methods - Part 2: Determination of copper content in copper-tungsten alloys JB/T 4107.2-1999 Electro-contact material chemical analysis method - Determination of copper content in copper-tungsten (iodometric method) JB/T 4107.3-2014 JBT 4107.3-2014 Electro-contact material chemical analysis methods Part 3: Determination of carbon content in silver graphite for silver graphite material JB/T 4107.4-2014 Chemical Analysis Methods for Electrical Contacts Materials - Part 4: Determination of Silver Content in Silver-Tungsten Alloys JB/T 4107.4-1999 Electro-contact material chemical analysis method Determination of silver content in silver-tungsten (iodimetric method) JB/T 4107.5-2014 Electric contact material chemical analysis methods - Part 5: Determination of nickel content in silver-nickel alloys. (English translation only) JB/T 4107.5-1999 Electro-contact material chemical analysis method Determination of nickel content in silver-nickel (EDTA capacity method) JB/T 4107.6-2014 Electro-contact material chemical analysis methods - Part 6: Determination of iron content in silver-iron alloys JB/T 4107.6-1999 Electro-contact material chemical analysis method - Determination of iron content in silver-iron (Determination of iron content using potassium dichromate method) JB/T 4107.7-1999 Electro-contact material chemical analysis method for determination of carbon content in silver graphite (carbon content determination by gas volume capacity method) JB/T 5351-2014 JB/T 5351-2014 Vacuum Switch Contact Material Basic Performance Test Method JB 5351-1991 Vacuum Switch Contact Materials - Basic Performance Test Methods