Heavy Melting Steel (HMS) 1 & 2, ISRI 200 (HMS 1) and ISRI 203, 204, 205, and 206 (HMS 2), are the most widely traded categories of ferrous scrap, used primarily in steelmaking and foundry industries. HMS 1 is composed of heavier scrap with no galvanised or blackened steel, typically thicker than 1/4 inch. HMS 2, on the other hand, includes thinner steel (at least 1/8 inch thick) and may contain galvanised or blackened steel. Together, HMS 1 & 2 offer a balanced mix of density and processing efficiency, making them ideal for electric arc furnace (EAF) steel production.
OA refers to Old Alloyed scrap, ISRI 204, 205, and 206, primarily made up of obsolete machinery parts, structural components, and alloy-based steel scrap that has been decommissioned from its original use. OA scrap typically contains varying levels of alloying elements such as chromium, nickel, or molybdenum, which may enhance its value for specific melting or refining applications. It is more complex to process than HMS due to its variable composition but is valuable for specialty steel production.
12A, ISRI 204, 205, and 206, is finely processed ferrous scrap produced by shredding automobiles, appliances, and light structural steel. It is generally uniform in size and density, free from excessive contamination, and ideal for high-efficiency melting in electric arc furnaces. Unlike HMS or OA, 12A offers a cleaner and more consistent feedstock, often preferred for its ease of handling and faster melting times.
Shredded steel scrap is a processed form of ferrous scrap, created by mechanically shredding light steel products such as vehicles, appliances, and structural scrap. The result is a clean, homogeneous, and dense feedstock that is ideal for electric arc furnace (EAF) and basic oxygen furnace (BOF) steelmaking. Classified under ISRI Code 211, shredded scrap is typically free of non-metallics and excessive rust, with a consistent particle size usually ranging from 1" to 4". Its uniformity ensures efficient melting, reduced furnace wear, and improved yield, making it a preferred material for high-volume steel production.