UNS-C68700-TUBE

UNS C68700 Aluminum Brass

UNS C68700/CDA 687/CW702R/CZ110/CuZn20A12As is Good to excellent corrosion resistance and Excellent cold workability for forming and bending.

 

Chemical Composition
Elements
Cu(1,2) Pb Zn Fe Al As
(1) Cu value includes Ag.
(2) Cu + Sum of Named Elements 99.5% min.
Min (%) 76.0 1.8 0.02
Max (%) 79.0 0.07 Rem 0.06 2.5 0.06

Mechanical properties:

Form Temper Temper Code Tensile Strength
(ksi)		 YS-0.5% Ext
(ksi)		 Elongation
(%)		 Rockwell F scale
* Measured at room temperature, 68°F (20°C).
Tube Nominal Grain Size 0.025 mm OS025 60 Typ 27 Typ 55 Typ 77 Typ

Physical Properties:Melting Point – Liquidus°F: 1780

Melting Point – Solidus°F: 1710

Density lb/cu in. at 68°F: 0.301

Specific Gravity: 8.33

Electrical Conductivity% IACS at 68°F: 23

Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F: 58

Coefficient of Thermal Expansion 68-57210 to -6 power per °F (68 – 572°F): 10.3

Specific Heat CapacityBtu/ lb /°F at 68°F: 0.09

Modulus of Elasticity in Tension ksi: 16000

Modulus of Rigidity ksi: 6000

Applications:
Condenser, evaporator and heat exchanger tubing, condenser tubing plates, distiller tubing, ferrules.

Equivalent materials to UNS C68700 arsenical aluminium brass alloy are:

ASME SB111
ASME SB359
ASME SB395
ASME SB543
ASTM B111
ASTM B359
ASTM B395
ASTM B543

Machinability
The machinability rate of the UNS C68700 is 30.

Welding
Soldering, brazing, oxyacetylene welding, gas shielded arc welding, spot welding, seam welding, and butt welding are considered suitable welding processes, whereas processes such as coated metal arc welding are not recommended for the UNS C68700 alloys.

Hot Working
The hot working capacity of the UNS C68700 is fair with the suitable hot working temperature ranging between 760 and 871.1°C (1400 and 1600°F).

Cold Working
The UNS C68700 has an excellent cold working capacity.

Annealing
The annealing temperature of the UNS C68700 is between 427 and 593°C (800 and 1100°F).