Copper-Boron Master Alloy from Japan
Master alloy of copper containing 4-8% boron, designed for grain refinement in copper casting alloys like bronzes. Classified under HTS 7405.00.60 as other copper master alloys, it provides controlled boron addition to enhance mechanical properties. Primarily used by foundries for high-strength castings.
Duty Rate — Japan → United States
0%
Rate breakdown
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• Submit assay reports confirming boron content and copper matrix to distinguish from commodity copper alloys
• Declare as 'master alloy for foundry use' on commercial invoice to prevent confusion with finished copper products
• Watch for valuation issues; master alloys command premium pricing over base copper