China tungsten crucibles,tungsten,crucibles manufacturer, factory, supplier - Tungsten Atomic Symbol : W Atomic Number : 74 Melting Point : 3410 DC Density : 19.30 g/cc Quality:ASTM B760 and ASTM B761 Content Pure tungsten ( W 99.95% ); Process Sintering, Forging, Rolling and Machining. Usage High-temperature furnace industry, glass and crystal producing, illumination, electronics, electron