C630, also known as AMS 4640 and ASTM B150, contains 9-11% aluminum, 5-5.5% nickel, and 2-4% iron, which give it both excellent corrosion resistance (even against chlorides) and good tensile strength. This alloy can be heat treated to increase strength and hardness, although at the expense of a reduction in elongation. C630 can also be hot worked and welded, but it is difficult to machine.
Nickel aluminum bronze has excellent anti-galling behavior when placed against steel, so it’s a popular choice for sliding contact applications. It’s also nonmagnetic, so it won’t collect steel particles. Its thermal and electrical conductivity are low.
| Property | Value | Notes |
|---|---|---|
| Material Type | Nickel-aluminum-bronze | UNS: C63000 (AMS 4640) |
| Density | 0.274 lb/in3 | |
| Melting Point | ~1,035-1,054°C | ~1,895-1,930°F |
| Hardness (Brinell) | ~201-248 | |
| Tensile Strength | ~690-760 MPa | ~100,000-110,000 psi |
| Yield Strength | ~345-470 MPa | ~50,000-68,000 psi |
| Elongation at Break | ~10% | |
| Modulus of Elasticity | ~120 GPa | ~17.5 x 106 psi |
| Corrosion Resistance | Very good | Especially good in seawater |
| Magnetism | Non-magnetic | |
| Heat Treatment | Can be hardened, strengthened, and annealed | |
| Machinability | Poor | Similar to 316 stainless steel |
| Weldability | Good | Arc and resistance welding only |
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