Pure charge subcooling large, is not conducive to the nucleation of graphite precipitation, less float. The main measures should be controlled to prevent the carbon equivalent according to the casting wall thickness; when small pieces of the wall thickness of not more than 30mm, appear critical carbon graphite floating equivalent of 4.7% - 4.9%; when the wall thickness of 30 to 100mm, appear critical carbon graphite floating equivalent of 4.5% - 4.6%; float appeared critical graphite carbon equivalent of 4.4% ~ 4.5% when the large wall thickness greater than 100mm. In particular, to control the carbon is less than 4. O%; the appropriate use of scrap, pig iron and silicon lower back with the use of charge; controlling the residual amount of rare earth is not too high; pouring temperature control; large cross section castings may be appropriate to add molybdenum or partial placement also prevents cold iron graphite float (see carbon equivalent cast iron, ductile iron). EDM graphite: EDM is a revolution in today's mold industry, which not only simplifies the traditional process means Qingdao graphite, and make it possible to manufacture shaped mold. Isostatic graphite due to isotropic, is the best material for the manufacture of graphite EDM electrodes. Since the carbon atoms arranged in close Lacey graphite quality, difficulty in the crystallization of graphite thermal vibration of atomic lattice layer, thereby the graphite to high temperature and having specific thermal properties. Graphite melting point of 3850 ℃, boiling point 4250 ℃, heat absorption 6.9036 × 107J / kg, the high temperature arc ignition minimal weight loss, strength increased by 1 at 2500 ℃ Qingdao graphite at room temperature when sold than when the thermal expansion coefficient (1.2 × 10-6), sudden changes in volume when the temperature changed little. Since electrons flow easily in the presence of graphite crystal, and therefore its conductivity, thermal conductivity less than the metal. Carbon graphite | Graphite | Sea Dragon by Carbon Carbon Co., Ltd. Weifang Sea Dragon. 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!