Heavy melting steel is a designation for recyclable steel. It is categorised into two major categories: HMS 1 and HMS 2. The difference between the two is HMS 1 does not contain galvanized and cast iron, whereas HMS 2 does. Because both grades guarantee a minimum piece thickness – at least 1/4inch (6.3mm) for HMS 1, and 1/8 in for HMS 2 – consignments have a high density. The typical constituents are plates, truck parts, structural items, large machinery parts, automatic parts, pipes, post consumer steel goods.

Plate and Structural Steel includes large diameter pipe, heavy walled pipe, plates , structural items and shearing or broken steel tires but it should not includes pipe over 8" diameter, reinforcing bar etc. Shredded Steel consists of homogeneous shredded steel scrap magnetically separated, originating from automobiles but it should not includes municipal scrap, lead coated steel, tin cans, etc.

Cast iron is iron or a ferrous alloy which has been heated until it liquifies, and is then poured into a mould to solidify. It is usually made from pig iron. The alloy constituents affect its colour when fractured.

Blue Steel is no. 1 bushelling Clean steel scrap, not exceeding 300 mm in any dimensions, including new factory bushelling (for example sheet clippings, stampings, etc.),cut pieces generated from fabrication units, cut pieces of billets, bloom, pipes etc but these should not include old auto body and fender stock.