The Melting Process: A Step-by-Step Guide. Preparing the Furnace: Before starting, check the furnace for any signs of wear or damage. Ensure all safety systems are functioning correctly.; Loading and Melting the Cast Iron: Load the furnace with the raw material and fuel (if required). Heat the furnace to the desired temperature, عادة بين 1,200 و 1,500 درجة مئوية.