Since the carbon atoms arranged in a crystalline lattice atom layer of graphite tightly graphite emulsion, thermal vibration difficulties, therefore graphite can withstand high temperatures and with specific thermal properties. Graphite melting point of 3850 ℃, boiling point 4250 ℃, heat absorption 6.9036 × 107J / kg carbon graphite, high temperature graphite arc minimal weight loss on ignition milk prices, the strength increased by 1 at 2500 ℃ ambient temperature when the ratio, 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. Pure charge subcooling large graphite, graphite precipitate nucleation is not conducive to floating less. 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). Lacey Graphite | Sea Dragon Carbon | graphite provided by Carbon Co., Ltd. Weifang Sea Dragon. Carbon Co., Ltd. Weifang Sea Dragon (www.longmentanye.com) Shandong Weifang, graphite and carbon products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the North Sea Dragon carbon industry leadership with the staff warmly welcome all inquiries negotiations to create the North Sea Dragon carbon industry a better future.