graphitized petroleum coke carburizer for steel making,foundry industry,nodular cast iron HS code3801100090,ISO9001 certifying Specifications as ... usOur company has been manufacturing and exporting graphite products for about 20 years,enjoying a good fame among the ... world.Our main items are used as carbon additives for steelmaking,foundry,casting and alloy,including Calcined Petroleum Coke(CPC), ...