CuSn6
CW452KPhosphor bronze with 6% tin — better cold formability than CuSn8 at slightly lower strength. Excellent spring properties and fatigue resistance. Used for electrical connectors, spring contacts, switch parts, bellows, bourdon tubes, and precision springs.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS C51900 | C51900 | REF |
| 🇪🇺 | EN | Europe | CuSn6 | CW452K | 100% |
Sources: ASTM B103, EN 1652
Chemical composition comparison (wt%)
Side-by-side: CuSn6 (EN 1652) vs CuSn6 (EN) (EN 1652)
| Element | CuSn6 (EN 1652) | CuSn6 (EN) | Overlap |
|---|---|---|---|
| P | — | 0.01–0.4% | — |
| Ni | — | 0–0.3% | — |
Mechanical properties
Compatibility verdict
CuSn6 and CuSn6: 100% composition match
Related materials
CuZn39Pb3
2.0401The most widely used free-cutting brass (machinability index 100%). Excellent for high-speed automatic lathe work. Used for turned parts, faucets, valves, fittings, screws, nuts, electrical connectors, and watch components. Also known as MS58.
CuSn8
2.1030Phosphor bronze with 8% tin. High mechanical strength, excellent wear resistance, good corrosion resistance (especially seawater). Self-lubricating sliding properties. Used for heavy-duty bearings, gears, worm wheels, springs, sliding elements, and connectors.
CuZn37
2.0321Lead-free alpha/alpha+beta brass (63% Cu, 37% Zn). Compromise between cold formability (CuZn35) and hot formability (CuZn40). The most widely used unleaded brass. Used for cartridge cases, radiator cores, lamp components, plumbing fixtures, and decorative hardware.
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