Phosphor Bronze C51000 Unwrought Ingots
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.
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 exceeds tin and meets brass definition
Copper-zinc base alloys (brasses) fall under 7403.21 when zinc predominates over other elements per subheading note (a).
If classified as master alloy for remelting
Master alloys of heading 7405 are specifically excluded from 7403 and used primarily for alloying additions in foundries.
If imported as billets or bars after hot-rolling
Worked copper alloys in forms like billets move to Chapter 74 headings 7407+ for semifinished products.
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Import Tips & Compliance
• Obtain mill test certificates verifying tin content exceeds other elements and meets subheading note (b) criteria to avoid reclassification
• Declare exact chemical composition on entry documents; discrepancies can trigger audits by CBP
• Ensure product is truly unwrought (not worked beyond simple casting) to prevent misclassification under Chapter 74 headings for semifinished goods
Related Products under HTS 7403.22.00.00
Leaded Tin Bronze C93200 Unwrought Bars
Unwrought SAE 660 (C93200) leaded tin bronze bars with 6-8% tin, 6-8% lead, suitable for bearings and bushings. Meets bronze definition as tin predominates over non-copper elements excluding allowable zinc. Cast in simple rectangular form without further working.
Aluminum Bronze C95400 Unwrought Ingots
C95400 aluminum bronze unwrought ingots with 10-11.5% aluminum, 4% iron, but critically 3.5-5% tin where tin predominates over other individual elements per note (b). Used for heavy-duty gears and marine propellers. High-strength casting alloy.
Silicon Bronze C65500 Unwrought Rods
Unwrought silicon bronze C65500 rods containing 3% silicon, 4.8% tin ensuring tin predominance for bronze classification. Corrosion-resistant alloy used in marine hardware and weld rods. Cast sections not mechanically worked.
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.
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
C86500 manganese bronze unwrought castings with 4% tin ensuring bronze classification despite 39% zinc and 3% manganese. High tensile strength for marine castings and gears. Complex alloy meeting tin-dominant criteria.