Spark Testing Metals and Spark Test Guide | Best Scrap ...
Get out your grinding wheel and use these photographs as a guide. Tungsten carbide, has a rockwell hardness of 88 to 90, second only to diamonds; its specific gravity is 16, almost as heavy as gold, twice as heavy as high speed steel. Tungsten carbide is very heavy and very hard; very hard is the basis of this test: If your scrap can only throw ...