Cupro-Nickel Fin Tubes are processed out of plain Cupro-Nickel Tubes conforming to SB-111 UNS No. 70400, 70600, 71000, 71500 and finning will be carried out as per SB-359.90:10 Cupro-Nickel exhibits excellent resistance to impingement attack. This alloy is suitable for Marine condenser tubes, especially where higher water velocities are encountered.