Notes: 1. Applicable for nominal thickness in excess of 1in (25mm) 2. Applicable for nominal thickness in excess of 0.5in (13mm) 3. Steelmaking process shall minimize the level of tramp elements introduced into the melt from scrap. LD converter process is preferred as this process can achieve lower tramp elements in the melt, but where electric arc process is used the level of scrap used shall be minimized and pre-selected.