Heavy melting steel (HMS) or heavy melting scrap is a designation for recyclable steel and wrought iron. It is broken up into two major categories: HMS 1 and HMS 2, where HMS 1 does not contain galvanized and blackened steel, whereas HMS 2 does. The Institute of Scrap Recycling Industries breaks up the categories further:

ISRI 200 (HMS 1): Wrought iron or steel scrap 1⁄4 inch and larger in thickness. All pieces must be smaller than 60×24 inches
ISRI 201 (HMS 1): Same as ISRI 200 except pieces must be smaller than 36×18 in.
ISRI 202 (HMS 1): Same as ISRI 200 except pieces must be smaller than 60×18 in.
ISRI 203 (HMS 2): Wrought iron or steel scrap, black and galvanized, 1⁄8 inch and larger in thickness.
ISRI 204 (HMS 2): Same as ISRI 203 except pieces must be smaller than 36×18 in.
ISRI 205 (HMS 2): Same as ISRI 204 except it may contain automotive scrap except for thin gauge material.
ISRI 206 (HMS 2): Same as ISRI 205 except pieces must be smaller than 60×18 in.

Renomatt Global Holding supplies premium quality Scrap Metals including old railroads R50/R65 and HMS 1 – HMS2

HMS 1
HMS 1 consists of heavy melting steel scrap containing no galvanized or blackened steel, and having a minimum thickness of 1/4 inch. Further categories include:
ISRI 200 (HMS 1): Wrought iron or steel scrap 1⁄4 inch and larger in thickness. All pieces must be smaller than 60×24 inches
ISRI 201 (HMS 1): Same as ISRI 200 except pieces must be smaller than 36×18 in.
ISRI 202 (HMS 1): Same as ISRI 200 except pieces must be smaller than 60×18 in.

HMS 1 and 2
Heavy melting steel (HMS) or heavy melting scrap is a designation for recyclable steel and wrought iron. It is broken up into two major categories: HMS 1 and HMS 2, where HMS 1 does not contain galvanized and blackened steel, whereas HMS 2 does. The Institute of Scrap Recycling Industries breaks up the categories further:
HMS 1 and 2 are widely traded, particularly in the western hemisphere. Both HMS 1 and 2 comprise obsolete scrap only. That is iron and steel recovered from items demolished or dismantled at the end of their life. Variations on maximum piece size are covered by ISRI (North America’s Institute of Scrap Recycling Industries) codes. HMS is usually traded as a blend of 1 and 2, either a premium blend (80:20) or lower grade mixes (70:30) and (60:40). Other major heavy scrap grades include Japan’s H2 and A3 from the CIS.
Renomatt Global Holding supplies premium quality Scrap Metals including old railroads R50/R65 and HMS 1 – HMS2
Our scrap metal business is focused on buying and selling scrap metal for industrial metal corporations in need of iron, steel and copper. This type of scrap metal business consists of scrap metal recycling a mix of mill scrap (stamping, cuttings, bars, etc.), industrial scrap pieces (nuts, bolts, etc), auto and truck frames and bodies, railroad scrap (wheels, axles, parts of locomotives and carriages, etc.), ship scrap (fittings, plate pieces, parts), construction scrap (plate, bars, angle pieces, rods, steel pipe, etc.), and miscellaneous commercial scrap (appliance casings, frames and parts, etc.).