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By certification 
San Neng Graphite carbon company graphite electrode factory production diameter 4inch graphite electrode, raw material selection of high-quality calcined graphite coke after 2000 tons of press molding, and then after 1200 degrees roasting, 1 month later after 3600 degrees of graphite, and finally after precision equipment processing finished products.
Diameter 100 graphite electrodes, mainly used in 1. ore furnace smelting, 2 resistance furnace heating, 3 arc furnace steelmaking.
http://www.3graphite.com/
