Reference Standard of Tungsten Points in Interrupter

Reference standard of tungsten points in interrupter as follows:

On chemical analysis of tungsten in 1984------ GB / T 4324.1-4324.30

About hardness test------ Metallic Rockwell hardness test method in 1991------ GB / T 230

                                     ------ Metallic Vickers hardness test method in 1984------ GB / T 4340

Interrupter in Magneto test method in 1999------ JB / T 9864.2

Technical condition of tungsten rod in interrupter points according to provisions of JB / T 9860.2 in 1999.

Test methods of rod crystals size of tungsten, sintered tungsten bar, molybdenum and alloys refer to GB / T 4197 regulations in 1984.

Batch inspection sampling procedures and sample forms in 1987 (go for continuous checks of batch products) ------ GB / T 2828

 

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