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Copper Alloy No. C38500

Architectural Bronze , CDA 385

Chemical Composition % by weight

Element Nominal Minimum Maximum
Copper 57 55 59
Lead 3 2.5 3.5
Iron - - .35
Zinc 40 Rem. Rem.

Applications

Architectural extrusions, trim, butts, hinges, lock bodies.

Common Fabrication Processes

Hot forging and pressing, hot forming and bending, machining. 

Mechanical Properties

Typical  for 1" dia. rod as extruded

Hardness* Rockwell B Scales 65
Tensile Strength** KSI 60
Yield Strength (.2% Offset)** KSI 20
Elongation** % in 2 inch 30

**Test values are nominal approximations and depend on specimen size and orientation.

Physical Properties

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 71
Specific Heat BTU/lb/F @ 68F .09
Thermal Expansion Per F from 68 F to 572 F .0000209
Density lb/cu in @ 68 F .306
Electrical Conductivity* (Annealed) % IACS @ 68 F 28
Modulus of Elasticity KSI 5,300

*Volume basis

Fabrication Properties

Capacity for being cold worked Poor
Capacity for being hot formed Excellent
Hot forgeability rating (forging brass =100) -
Hot working temperature 1150-1350 F (625-725 C)  
Annealing temperature 800-1100 F (425-600 C)
Machinability rating (Free Cutting Brass=100) 90
Suitability for being joined by: Soldering/Excellent
Brazing/Good
Oxyacetylene Welding/Not Recommended
Gas Shielded Arc Welding/Not Recommended
Coated Metal Arc Welding/Not Recommended
Resistance Welding Spot/Not Recommended
Seam/Not Recommended
Butt/Fair

The values listed above represent reasonable approximations suitable for general engineering use. Due to commercial variations in composition and to manufacturing limitations, they should not be used for specification purposes. See applicable A.S.T.M. specification references.