HMS (Heavy Melting Scrap) refers to recyclable ferrous metal scrap commonly used as a raw material in steel manufacturing. It mainly consists of thick, heavy iron and steel materials such as old machinery, structural steel, ship scrap, pipes, beams, rails, and industrial metal waste. HMS scrap is classified primarily into HMS 1 and HMS 2, based on thickness and cleanliness. HMS 1 generally includes cleaner, thicker scrap with minimal rust or coatings, while HMS 2 may contain thinner materials and surface oxidation. Both grades are widely traded in the global scrap metal market. This material is melted in electric arc furnaces or induction furnaces to produce new steel products, making it an important component of sustainable and cost-effective steel production. HMS is valued for its high density, recyclability, and consistent iron content.