... 3-8mm,5-10mm or as per customer’s requirement. Carbon raiser graphite petroleum coke:GPC/Graphitized Petroleum Coke 1. ... left, save production cost.1, Usage: used to improve the Carbon content in steel-melting and Ductile iron foundry2, Characteristic: high ... sulfur, with stable effect for improving the carbon content, high absorptive of carbon.3, apply: Used in electric furnace steel smelting and ...