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.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | C52100 | C52100 | REF |
| 🇺🇸 | UNS | USA | C52100 | C52100 | REF |
| 🇪🇺 | EN | Europe | CuSn8 / CW453K | 2.1030 | 100% |
| 🇬🇧 | BS | United Kingdom | PB104 / B24 | — | 97% |
| 🇯🇵 | JIS | Japan | C5210 | — | 93% |
Sources: ASTM B103, EN 12163, BS 2874, JIS H3270
Chemical composition comparison (wt%)
Side-by-side: CuSn8 (EN) (EN 12163) vs PB104 / B24 (BS)
| Element | CuSn8 (EN) | PB104 / B24 (BS) | Overlap |
|---|---|---|---|
| P | 0.01–0.4% | — | — |
| Ni | 0–0.3% | — | — |
| Cu | — | — | — |
| Sn | 7.5–8.5% | — | — |
| Zn | 0–0.3% | — | — |
| Fe | 0–0.1% | — | — |
| Pb | 0–0.05% | — | — |
Mechanical properties
Drawn
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 450–540 | MPa |
| Yield Strength | ≥ 300 | MPa |
| Elongation | ≥ 18 | % |
| Hardness HB | 120–170 | HB |
| Elastic Modulus | ≥ 110 | GPa |
| Density | ≥ 8.8 | g/cm3 |
Annealed R370
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 370 | MPa |
| Yield Strength Rp0.2 | ≥ 150 | MPa |
| Elongation A | ≥ 50 | % |
Hard R700
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 700 | MPa |
| Yield Strength Rp0.2 | ≥ 620 | MPa |
General
| Property | Value | Unit |
|---|---|---|
| Density | 8.8 | g/cm³ |
| Electrical Conductivity | 12–15 | % |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| annealing | 500–700 °C | air | 1-2 hours | Stress relief at 200-300°C. Full anneal at higher temps. |
Compatibility verdict
CuSn8 and PB104 / B24: 97% composition match
Close equivalents but NOT identical.
Related materials
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.
CuZn36Pb3
CW603NFree-cutting leaded brass — the benchmark for non-ferrous machinability (rated 100%). Lead particles act as chip breakers for excellent surface finish. Used for screw machine parts, fittings, valves, watch components, precision mechanics, and electrical connectors. Old DIN number 2.0375.
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.
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