Coke used as blast furnace fuel is mainly produced from bituminous coal worldwide. There is coke from petroleum (usually called petcoke) where one of the main usages is material for anodes in smelters (so speaking in-game, petcoke should be used for what graphite is now). Some petcoke is also used in blast furnaces, but far less common than coal coke.
Proper graphics for the coking unit will co…