C68700 – Aluminum brass – CuZn22AL2

Strong corrosion resistance makes this alloy excellent for use with high cooling water velocities.

Inhibited aluminum brass tubes (C68700) are designed to resist the effects of high-velocity salt and brackish water, making them ideal for use in condenser tubes. A key feature of C68700 is its exceptional resistance to impingement attack.

These tubes are highly recommended for use in marine and land-based power stations, where cooling water velocities are particularly high, as well as in water desalination plants, where their resistance to corrosion and erosion ensures reliable performance in the harsh conditions of seawater treatment.

No. UNS

C68700 – BSI No. CZ110 – ISO name CuZn22AI2

Chemical comp. (%)

Cu 76 ~ 79 / Al 1.8 ~ 2.5 / Pb 0.07 / Fe 0.06 max / Zn rem / As 0.02 ~ 0.06

ASTM spec.

B 111, B 395

ASME spec.

SB 111, SB 395

Applications

Heat exchangers, condensers, and cooling systems; desalination equipment.

Temper

O61 annealed

Properties *

Metric

English

Density

8.33 g/cc

0.301 lb/in³

Tensile strength

345 MPa

50 ksi

Yield strength

125MPa

18 ksi

CTE, linear

18.5 10-6/°C @ 20 – 300°C

10.3 10-6/°F @ 70 – 570°F

Specific heat capacity

0.09 cal/g-°C @ 20ºC

0.09 BTU/lb-°F @ 70ºF

Thermal conductivity

100.4 W/m-K @ 20°C

58 BTU/ft2/ft/h/°F @ 70°F

Melting point

932 ~ 971°C

1710 ~ 1780°F

* The information provided on this page includes typical values which are only for general reference and information. These values are not intended for exact specification, design or engineering purposes.