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HMS. Heavy Melting Steel. ISRI codes 200-206

PNS. Plate and Structural Steel. ISRI codes 230-231



EISENHARDT supplies Heavy Melting Steel, HMS, and Plate and Structural Steel, PNS.

Heavy melting steel or heavy metal 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.


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.

Because both grades guarantee a minimum piece thickness – at least 1/4 inch (6.3 mm) for HMS 1, and 1/8 in for HMS 2 – consignments have a high density. Both also have defined maximum dimensions (usually 60 in × 24 in), 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.


Our Plate and Structural Steel, PNS, clasified under ISRI codes 230 and 231, is obtained from structural demolitions realized in industrial works by EISENHARDT qualified staff and obtained also from our associated scrap yards.

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) called Light Meling Steel, LMS. Other major heavy scrap grades include Japan’s H2 and A3 from the CIS.