Aluminum Bronze C61400
The 7 percent aluminum bronze — 75 to 110 ksi as a fastener, weldable, and resistant to seawater, brine and dilute acids.
What C61400 Aluminum Bronze is.
C61400 is an alpha aluminum bronze with about 7 percent aluminum and 2.5 percent iron. The aluminum forms a tough, self-healing oxide film that gives the alloy corrosion resistance close to the nickel-aluminum grades, and the iron refines the grain for strength and fatigue resistance. Unlike the higher-aluminum bronzes it is single phase, so it is readily welded and cold worked.
ASTM F468 lists C61400 fasteners as Cu 614 (marking F468G). We machine C61400 studs, bolts and components from certified B150 rod.
Chemical composition.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Copper | Cu | balance | — |
| Aluminum | Al | 6.0 | 8.0 |
| Iron | Fe | 1.5 | 3.5 |
| Manganese | Mn | — | 1.0 |
| Zinc | Zn | — | 0.20 |
| Lead | Pb | — | 0.01 |
| Phosphorus | P | — | 0.015 |
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 | 70–95 HRB | 75–110 | 35 | 75 | 35 | 30 |
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 | 70 HRB | 75 |
| Heavy hex, large hex flange and thick | 70 HRB | 81 |
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 and under | 80 | 40 | 30 |
| HR50 — over ½ to 1 | 75 | 35 | 30 |
| HR50 — over 1 to 2 | 70 | 32 | 30 |
| HR50 — over 2 to 3 | 70 | 30 | 30 |
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 C61400 Aluminum Bronze ships from Houston.
- Hex bolts, studs and cap screws to F468
- Hex and heavy hex nuts to F467
- Tube-sheet, pump and valve components machined to print
- Certified B150 rod
C61400 Aluminum Bronze fasteners we make.
Every item is manufactured to your drawing or standard in C61400 Aluminum Bronze, imperial or metric, with an EN 10204 3.1 certificate.
What is C61400 aluminum bronze?
Aluminum bronzes replace tin with aluminum, which is both cheaper and more effective at strengthening copper. At 7 percent aluminum the alloy remains single-phase alpha, so C61400 keeps the ductility and weldability that the two-phase 10 percent grades lose, while the iron addition brings tensile strength to 75 ksi and above. The aluminum oxide surface film resists seawater, brackish water, dilute sulfuric and phosphoric acids and many alkalis.
Choosing among the aluminum bronzes
C61400 is the weldable, formable grade. C63000 nickel-aluminum bronze is stronger and harder and is the usual choice for heavily loaded fasteners and wear parts. C64200 aluminum-silicon bronze machines far better and is preferred for screw-machine work and valve stems. All three share the seawater resistance that makes the family a standard for marine and power-station hardware.
Testing, certification and marking
- Tensile and hardness tested per lot on the finished product
- Grade or alloy marking F468G on bolts and F467G 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
Recent C61400 Aluminum Bronze jobs.
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.
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 F468 / F467 fasteners · ASTM B98 rodHigh-Silicon Bronze C65500
The strongest common silicon bronze in bar form, 90 ksi in hard temper and 100 ksi extra-hard in small rod — for machined marine fasteners, valve stems and pump parts.