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Free Cutting Brass - CDA 385

Free Cutting Brass (CDA 385) is a copper-zinc alloy with added lead, offering excellent machinability and corrosion resistance. It is widely used in architectural and industrial applications where ease of cutting and forming is required.

Chemical Composition

Element

Composition (%)

Copper

 60 (maximum)

Lead

 4.50 (maximum)

Zinc

 Rem.

 

Physical Properties

Property

Value
Density 0.306 lb/in³
Melting Point 1,610-1,630 °F
Specific Heat 9.08 x 10⁻² BTU/lb-°F
Thermal Conductivity 854 BTU-in/hr-ft²-°F
Electrical Conductivity 28% IACS
Modulus of Elasticity 14,100 ksi
Shear Modulus 5,370 ksi
Poisson's Ratio 0.31

Mechanical Properties

Property

Value

Tensile Strength

400 MPa

Yield Strength

200 MPa

Elongation

20%

Hardness

135 HV

Thermal Properties

Property

Value

Annealing Temperature Range

425°C - 600°C (797°F - 1112°F)

Hot Working Temperature Range

700°C - 800°C (1292°F - 1472°F)

Fabrication Properties

Property

Characteristic

Cold Working

Poor

Hot Working

Fair to Excellent

Machinability

Excellent (Rating: 90)

Soldering

Excellent

Brazing

Good

Oxyacetylene Welding

Not Recommended

Gas Shielded Arc Welding

Not Recommended

Coated Metal Arc Welding

Not Recommended

Spot Welding

Not Recommended

Seam Welding

Not Recommended

Butt Welding

Fair

Hot Forging

Excellent

Hot Bending

Excellent

Hot Forming

Excellent

Hot Pressing

Excellent

Annealing Temperature Range

800-1100°F (425-593°C)

Hot Working Temperature Range

1150-1350°F (621-732°C)

Common Applications

Common applications of Free Cutting Brass (CDA 385) include:

  • Architectural hardware and fittings
  • Plumbing fixtures and components
  • Valve and pump components
  • Decorative trim and handles
  • Electrical connectors and terminals

How Can Drawn Metal Help

If you have any queries about the metal products that we offer, don’t hesitate to get in touch with us. 

 

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