Product Description

Heavy melting steel (HMS) or heavy melting scrap, is a designation for recyclable steel and wrougt iron. It is broken up into two major categories: HMS 1 and HMS 2. The difference between the two is 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 **0 (HMS 1): Wrought iron and/or steel scrap 1⁄4 inch and larger in thickness. All pieces must be smaller than *0x*4 in.
• ISRI **1 (HMS 1): Same as ISRI **0 except pieces must be smaller than *6x*8 in.
• ISRI **2 (HMS 1): Same as ISRI **0 except pieces must be smaller than *0x*8 in.
• ISRI **3 (HMS 2): Wrought iron and/or steel scrap, black and galvanized, 1⁄8 inch and larger in thickness.
• ISRI **4 (HMS 2): Same as ISRI **3 except pieces must be smaller than *6x*8 in.
• ISRI **5 (HMS 2): Same as ISRI **4 except it may contain automotive scrap except for thin gauge material.
• ISRI **6 (HMS 2): Same as ISRI **5 except pieces must be smaller than *0x*8 in.

HMS stands for heavy melting scrap, and 1 & 2 are the two grades within that definition. They are widely traded, particularly in the western hemisphere.

Both HMS 1 & 2 comprise obsolete scrap only. That is iron and steel recovered from items demolished or dismantled at the end of their life.

Because both grades guarantee a minimum piece thickness at least 1/4inch (6.3mm) for HMS 1, and 1/8in for HMS 2 consignments have a high density. Both also have defined maximum dimensions (usually *0in x *4in), and should be prepared to facilitate handling and charging to a furnace.

This density, sizing and preparation makes for efficient furnace operation by minimising the time to charge enough scrap for a full melt. In contrast, thin mixed scrap greatly increases charging time, cutting furnace productivity.

Variations on maximum piece size are covered by ISRI (North Americas Institute of Scrap Recycling Industries) codes. HMS is usually traded as a blend of 1 & 2, either a premium blend (*0:*0) or lower grade mixes (*0:*0) and (*0:*0). Other major heavy scrap grades include Japans H2 and A3 from the CIS.