What C72200 is
C72200 is roughly 84% copper, 16% nickel, with about 0.5% chromium and 0.5% iron. The chromium strengthens the protective film so it stays put at high velocities and in turbulent inlet regions, giving C72200 erosion-corrosion resistance about double that of C70600 and better than C71500 in many tests.
It was developed for naval condensers and is now used wherever a condenser has shown repeated inlet-end erosion, or where harbor water carries sulfides that attack conventional copper-nickel.
Standards we supply to
- ASME SB-111 / ASTM B111, condenser and heat exchanger tube
- Naval and customer specifications on request
Chemical composition
| Element | Requirement |
|---|---|
| Copper | Remainder |
| Nickel | 15.0 to 18.0% |
| Chromium | 0.30 to 0.70% |
| Iron | 0.50 to 1.0% |
| Manganese | 1.0% max |
| Zinc | 1.0% max |
Typical mechanical properties, annealed
| Property | Value |
|---|---|
| Tensile strength | 45,000 psi min (310 MPa) |
| Yield strength | 16,000 psi min (110 MPa) |
| Elongation in 2" | 30% min |
Where it is used
- Naval surface ship and submarine condensers.
- Coastal power station condensers with inlet-end erosion history.
- Offshore platform seawater coolers with high flow rates.
- Any seawater exchanger where the water is polluted, sandy, or turbulent.
Talk to us before you specify it
C72200 is a premium alloy. In clean water at moderate velocity, C70600 does the job for less. We make both and will tell you honestly which the service needs.
OD, wall, length, quantity, the governing spec, the design water velocity, and whether the service is polluted or sulfide-bearing. That last point decides whether C72200 or C71500 is the better choice.