Nickel-Aluminum Bronze C63000
Steel-like strength in a bronze — 100 to 130 ksi as a fastener — with seawater, cavitation and wear resistance for propellers, pumps, valve seats and subsea hardware.
What C63000 Ni-Al Bronze is.
C63000 is a 10 percent aluminum bronze with about 5 percent nickel and 3 percent iron. The nickel and iron form kappa-phase particles that push the tensile strength to 100 ksi and beyond, give excellent wear and cavitation resistance and improve corrosion resistance in seawater to the point that the alloy is the standard for naval propellers, pump impellers and valve seats.
ASTM F468 lists C63000 fasteners as Cu 630 (marking F468H) at 100 to 130 ksi, the highest strength of any copper alloy in the specification. We machine C63000 bolts, studs, nuts and components from certified B150 rod.
Chemical composition.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Copper | Cu | balance | — |
| Aluminum | Al | 9.0 | 11.0 |
| Nickel (incl. cobalt) | Ni | 4.0 | 5.5 |
| Iron | Fe | 2.0 | 4.0 |
| Manganese | Mn | — | 1.5 |
| Silicon | Si | — | 0.25 |
| Tin | Sn | — | 0.20 |
| Zinc | Zn | — | 0.30 |
Values per ASTM B150/B150M-19 Table 1 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team.
Mechanical properties.
| Nominal diameter (in.) | Hardness | Full-size tensile (ksi) | Full-size yield, min (ksi) | Machined tensile, min (ksi) | Machined yield, min (ksi) | Elongation in 4D, min (%) |
|---|---|---|---|---|---|---|
| All sizes | 85–100 HRB | 100–130 | 50 | 100 | 50 | 5 |
Values per ASTM F468-23 Table 2 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team. Full-size tensile range and yield; machined-specimen minimums in the last three columns.
| Nut style | Hardness, min | Proof stress, min (ksi) |
|---|---|---|
| Hex and hex flange | 85 HRB | 100 |
| Heavy hex, large hex flange and thick | 85 HRB | 108 |
Values per ASTM F467-24 Table 2 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team.
| Temper and size (in.) | Tensile strength, min (ksi) | Yield strength at 0.5 % extension, min (ksi) | Elongation, min (%) |
|---|---|---|---|
| HR50 — ½ to 1 | 100 | 50 | 5 |
| HR50 — over 1 to 2 | 90 | 45 | 6 |
| HR50 — over 2 to 3 | 85 | 42.5 | 10 |
| HR50 / annealed — over 3 to 4 | 85 | 42.5 | 10 |
| HR50 / annealed — over 4 | 80 | 40 | 12 |
Values per ASTM B150/B150M-19 Table 2 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team.
Specifications that apply.
How C63000 Ni-Al Bronze ships from Houston.
- Hex bolts, studs and cap screws to F468
- Hex and heavy hex nuts to F467
- Valve seats, stems and pump wear rings machined to print
- Bushings, gears and slides
- Certified B150 rod and bar
C63000 Ni-Al Bronze fasteners we make.
Every item is manufactured to your drawing or standard in C63000 Ni-Al Bronze, imperial or metric, with an EN 10204 3.1 certificate.
What is nickel-aluminum bronze?
Adding nickel and iron to a 10 percent aluminum bronze produces a complex multi-phase structure with strength rivalling quenched-and-tempered steel and corrosion resistance better than any other copper alloy in seawater. The nickel suppresses the dealuminification that troubles plain high-aluminum bronzes, and the alloy resists cavitation and erosion, which is why it dominates propeller and pump-impeller service. It is also non-sparking and slightly magnetic because of its iron.
As a fastener
At 100 to 130 ksi full-size tensile and 50 ksi yield, F468H is the strongest copper-alloy fastener grade and one of the few that competes with steel on load. Elongation is low, 5 percent minimum, so the alloy is machined rather than headed, and threads are cut or rolled from bar. Nuts to F467 (F467H) carry a 100 ksi proof stress. It is widely used for subsea and naval bolting where magnetic signature, sparking or seawater rule out steel.
Testing, certification and marking
- Tensile and hardness tested per lot on the finished product
- Grade or alloy marking F468H on bolts and F467H on nuts and manufacturer's identification on every piece
- EN 10204 3.1 material test report with heat number and chemistry; 3.2 witness available
- Alloy identified by UNS number on the certificate
Aluminum Bronze C61400
The 7 percent aluminum bronze — 75 to 110 ksi as a fastener, weldable, and resistant to seawater, brine and dilute acids.
ASTM F468 / F467 fasteners · ASTM B150 rod and barAluminum-Silicon Bronze C64200
The screw-machine aluminum bronze — 75 to 110 ksi with 60 percent machinability — for valve stems, pump parts and turned marine fasteners.
ASTM B505 continuous-cast barCast Nickel-Aluminum Bronze C95500
The strongest common cast bronze — 95 ksi as cast, 110 ksi heat treated — for propeller hubs, seawater valve bodies, gears and the heaviest wear applications.