Naval Bronze C46400 Unwrought Plates
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If zinc content reaches 10%+ dominating tin
Excess zinc mandates brass classification under subheading note (a) strict definitions.
If after hot-forging into circles or plates
Any working beyond simple casting moves product to semifinished copper alloy headings.
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Import Tips & Compliance
• 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
Related Products under HTS 7403.22.00.00
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Unwrought phosphor bronze C51000 ingots containing approximately 5% tin and 0.2% phosphorus, classified as copper-tin base alloy under subheading note (b) because tin predominates over other elements. These are used in manufacturing electrical components and springs. Supplied in large cast form for remelting.
Leaded Tin Bronze C93200 Unwrought Bars
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Aluminum Bronze C95400 Unwrought Ingots
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Silicon Bronze C65500 Unwrought Rods
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High-Leaded Tin Bronze C93800 Ingots
C93800 high-leaded tin bronze ingots with 10% tin, 20% lead for exceptional machinability in screw machine products. Tin predominance maintains bronze status despite high lead. Used for high-speed machining applications.
Manganese Bronze C86500 Unwrought Form
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