Subheading 720110: Iron; Non-alloy Pig Iron Containing by Weight 0.5% or Less of … etc.
Subheading 720120: Iron; Non-alloy Pig Iron Containing by Weight more than 0.5% … etc.
Subheading 720150: Iron; Alloy Pig Iron; Spiegeleisen, in Pigs, Blocks or other … etc.