Crucible graphite

The graphite crucible can be divided into normal graphite crucible, abnormal graphite crucible and high pure graphite crucible. The main material of graphite crucible is Crystalline natural graphite, so it keep natural graphite physical properties. The graphite crucibles have good heat conductivity. Using in the high temperature, due to small coefficient of expansion, it has good thermal shock resistance. It also has good chemical stability. Due to has above properties, the graphite crucibles are widely use in metallurgical, casting, mechanical and chemical industries, widely used in alloy tool steel, non ferrous metal and other alloy smelting. The crucibles generally divided into three types: The first type is Copper smelting crucibles; The second type is Copper alloy smelting crucibles; The third type is Steel smelting crucibles. The graphite crucible is using to smelt gold, silver, copper, aluminum, lead and Zinc etc non ferrous metal and medium carbon steel and other rare metals. The physical property: Refractoriness : 1650 degree min Apparent Porosity: 30% max Bulk Density: 1.7g/cm3 min Compression Strength: 8.5MPa min Chemical Composition: C : 20-45%; SIC : 1-40%; AL2O3 : 2-20%; SIO2 : 3-38%.