Naval Bronze C46400 Unwrought Plates from Canada
Unwrought naval bronze C46400 cast plates with 39-42% zinc and 5% tin, but tin content controls classification as copper-tin base per note (b) allowance for zinc up to 10% when tin ≥3%. Traditional propeller and valve alloy.
Duty Rate — Canada → United States
1%
Rate breakdown
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• Note allows zinc up to 10% in bronzes; document this explicitly to prevent brass reclassification
• Propeller manufacturers often require MIL-SPEC certification; include with commercial invoice
• Beware Form 3229 requirements for alloys destined for defense contractors