In graphite crystal, the carbon atoms in the same layer sp2 hybrid form a covalent bond, each carbon atom covalently linked to three with three other atoms. Six carbon atoms in the same plane to form a regular six-ring-shaped graphite milk again and again, stretching into a lamellar structure, where the keys are all CC bond length 142pm, this is just part of the bond length range atomic crystals, so for the same layer to that it is an atomic crystal. Carbon atoms in the same plane but also each of the remaining one p orbital, they overlap each other. Electronic relatively free, equivalent metal free electrons, it can be thermally and electrically conductive graphite graphite, which is the metal crystal characteristics. Therefore classified as a metal crystal. Causes and occurrence: graphite is formed at high temperatures. Is the most widely distributed metamorphic graphite deposit, rich in organic matter by the Department or carbonaceous sedimentary rocks formed by regional metamorphism China: Lacey City, Shandong Province, one of the important producer of graphite manufacturer of graphite, graphite proved reserves of 6,871,100 tons now reserves 6,399,300 tons. Another one is the graphite origin Panshi, graphite reserves of 5 million tons. World: Famous Origin: New York Ticonderoga, Madagascar and Ceylon, our Heilongjiang Jixi Liu Mao was the largest producer. Melting in the molten iron is too saturated, with decreasing temperature of the molten iron, carbon is deposited on the surface of the casting graphite morphology, defect ductile iron, compacted graphite iron and other iron-carbon equivalent prone. Often appear in the casting thick at the surface, a lower surface of the sand core or casting solidification last place, such as riser, riser neck edge. It was a dense dark spots (glossy black), a large number of spherical-shaped blossom, dendritic graphite aggregation. This is also a segregation of graphite image density, macroscopic fracture was continuous uniform distribution, uniform layer of black color spots, low magnification microscope (20 to 40-fold) was observed was significantly lower aggregate graphite; 100 fold observed, graphite dense clusters or joined together. The area of ??high carbon content, magnesium, rare earths, sulfur is also high, hardness, tensile strength, impact toughness decreases. Graphite products, graphite, carbon industry is provided by the North Sea Dragon Sea Dragon Carbon Co., Ltd. Weifang. Carbon Co., Ltd. Weifang Sea Dragon (www.longmentanye.com) strong, credible, Shandong Weifang graphite and carbon products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the industry in the North Sea Dragon carbon into the brilliant and you work for a better future!