... furnace /holding furnace/heating furnace Main function : Smelting Steel scrap ,iron scrap, sponge iron / DIR ,copper scrap , aluminum alloy, heat treating ,through heating bar ,sintering ... . Raw Material rate: 100% steel scrap or 100% iron scrap or 50% to 80% iron scrap with 50% to 20% Sponge iron / DIR or bar, billets ...