HMS stands for Heavy Melting Scrap. It is the description of recyclable steel and wrought Iron. HMS 2 contains galvanized and blackened steel whereas HMS 1 contains clean iron and steel.
HMS1 and HMS2 is usually the preferred scrap used in the production of steel because scrap cools the enormous quantity of heat produced during recycling steel. Also, use of scrap reduces the total cost of producing steel. Scrap differs in regard to the content of iron and of some tramp elements.
HMS 1&2 80:20 with specification ISRI code 200-206:
The scrap consists out of a mix of mill scrap (stampings, cuttings, bars, etc.), Industrial scrap (nuts, bolts, misc. pieces, etc), auto and truck frames, ship scrap (fittings, plate pieces, and parts), construction scrap (plate, bars, angle pieces, rods, steel pipe, etc. and miscellaneous commercial scrap (casings & frames).
Non-Metal impurities total of 1 (one percent), or less. Free from mud, dust, fluff, non-ferrous inclusions, excessive rust and other impurities. (OR Free from concrete, dirt, and foreign material of any kind)