HMS NO.1 ISRI CODES 200: No.1 Heavy melting steel. Wrought iron and/or steel scrap ¼ inch and over in thickness. Individual pieces not over 60x24 inches (charging box size) prepared in a manner to insure compact charging 201: No. 1 Heavy melting steel 3 feet x 18 inches. Wrought iron and/or steel scrap ¼ inch and over in thickness. Individual pieces not over 36x 18 inches (charging box size) prepared in a manner to insure compact charging 202: No. 1 Heavy melting steel 5 feet x 18 inches. Wrought iron and/or steel scrap ¼ inch and over in thickness. Individual pieces not over 60x 188 inches (charging box size) prepared in a manner to insure compact charging 231: Plate and Structural Steel, 5 feet and under HMS NO. 2 ISRI CODES 203: No. 2 Heavy melting steel. Wrought iron and steel scrap, black and galvanized, 1/8 inch and over in thickness, charging box size to include material not suitable as No. 1 heavy melting steel. Prepared in a manner to insure compact charging. 204: No. 2 Heavy melting steel. Wrought iron and steel scrap, black and galvanized, maximum size 36x18 inches. May include all automobile scrap properly prepared. 205: No. 2 Heavy melting steel 3 feet x 18 inches Wrought iron and steel scrap, black and galvanized, maximum size 26 x 18 inches. May included automobile scrap properly prepared: however, to be free of sheet iron or thing gauged material. 206: No. 2 Heavy melting steel 5 feet x 18 inches. Wrought iron and steel scrap, black and galvanized, maximum size 60 x 18 inches. May included automobile scrap properly prepared: however, to be free of sheet iron or thing gauged material. SHREDDED SCRAP ISRI Code 210: Homogeneous iron and steel scrap, magnetically separated, originating from automobiles, unprepared No. 1 and No. 2 steel, miscellaneous baling and sheet scrap. Average density 50 pounds per cubic foot. ISRI Code 211: Homogeneous iron and steel scrap, magnetically separated, originating from automobiles, unprepared No. 1 and No. 2 steel, miscellaneous baling and sheet scrap. Average density 70 pounds per cubic foot