Copper Nickel Flange Materials
We manufacture flanges in the two copper-nickel alloys used for seawater piping. Chemistry and mechanical requirements are set by the applicable ASTM or ASME material specification on every order.
Copper Nickel 90/10
UNS C70600
The most widely specified copper-nickel alloy for seawater piping and cooling-water systems.
Copper Nickel 90/10 flangesCopper Nickel 70/30
UNS C71500
Higher nickel content for greater strength and tolerance of demanding seawater duty.
Copper Nickel 70/30 flanges90/10 and 70/30 compared
A qualitative guide. Your materials engineer decides for your design.
| Property | Cu-Ni 90/10 | Cu-Ni 70/30 |
|---|---|---|
| Nominal composition | 90% copper, 10% nickel, with controlled iron and manganese | 70% copper, 30% nickel, with controlled iron and manganese |
| Wrought UNS designation | C70600 | C71500 |
| Strength and hardness | Lower | Higher |
| Tolerance of high flow velocity and impingement | Good; set by design velocity limits | Better than 90/10; set by design velocity limits |
| Relative material cost | Lower | Higher (more nickel) |
| Typical flange use | General seawater piping, cooling water, firewater, ballast | Higher-velocity or more demanding duty, or to match 70/30 pipe and tube |
Read the full comparison: 90/10 vs 70/30 copper nickel.
Specify the alloy you need
State the alloy, material specification and flange type. We will quote what you specify.