Casting China Petroleum Coke Supplier Form Custom Graphitized Petroleum Coke GPC. Efficient Recarburizer Performance: Reduces sulfur and nitrogen in molten metal for high-quality steel and cast iron. Customized Standard and Packing: Standards and shipping marks can be customized according to customer requests. 20 Years Production Experience: Large-scale enterprise with over two decades of expertise in graphite production. Strict Quality Control System: Includes pre-production samples, final inspections, and dedicated laboratory testing. Free Sample Availability: Samples provided free of charge; customer only covers shipping costs. Flexible Customization Options: Offers full, minor, and flexible customization from samples or designs. Global Export Experience: Exporting since 2008 to markets in Europe, America, Asia, and Africa.