Heavy melting steel (HMS) or heavy melting scrap is classified into two primary types: HMS 1 and HMS 2 includes galvanized and blackened steel, In contrast to HMS 1, Which lacks these HMS is, Materials. Typically a traded commodity comprising a mix of 1 and 2, Featuring a high-quality 80/20 blend or more economical combinations of 70/30 and 60/40 As the composition, An illustration of hms 1 and 2 at an 80/20 ratio should include 80% of hms 1 and 2 HMS 2 grades 1 and 20% ensure that each piece has a minimum thickness of no less than 1/4 inch (6. 3 mm) 1 and 1/8 inches for HMS 2HMS 1 and 2 specifications as outlined by ISRI North America’s institute The scrap recycling sector adheres to ISRI specifications for HMS 1 wrought iron and/or steel scrap measuring 1/4 inch or thicker items should not exceed 60 24 in., Adhering to ISRI spec 201 HMS 1, Which is similar to ISRI 200 with the exception that the pieces must be Must be under 36 18 in. According to ISRI identical to ISRI 200, Spec 202 HMS 1, With the condition that no piece exceeds 60 Wrought iron and/or steel scrap, Measuring 18 inches, Conforming to ISRI spec 203 HMS 2, Available in black and with a, Galvanized finishes thickness of 1/8 inch or greater Specification 204 HMS 2 aligns with ISRI 203, With the exception that fragments should not exceed 36 x 18 inches. Refers to ISRI spec 205 HMS Similar to ISRI 204, This grade may include excluding thin, Automotive scrap gauge materials. Referencing ISRI specification 206 HMS 2 identical to isri 205, But components should be under 60 18 in size in.