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Copper Alloy No. C48500

Naval Brass , ASTM B21 CDA 485 

Chemical Composition % by weight

Element Nominal Minimum Maximum
Copper 60 59 62
Lead 1.8 1.3 2.2
Iron - - .10
Tin .70 .50 1
Zinc 37.5 Remainder

Applications

Marine hardware, screw machine products, valve stems.

Common Fabrication Processes

Hot forging, pressing and machining.

Mechanical Properties

Typical for 1" Rod Half Hard (20%) Temper

Hardness* Rockwell B Scales 82
Tensile Strength** KSI 75
Yield Strength** (.5% EAU) KSI 53
Elongation** % in 2 inch 15

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

Physical Properties

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 67
Specific Heat BTU/lb/F @ 68F .09
Thermal Expansion Per F from 68 F to 572 F .0000118
Density lb/cu in @ 68 F .305
Electrical Conductivity* (Annealed) % IACS @ 68 F 26
Modulus of Elasticity (Tension) KSI 15,000

*Volume basis

Fabrication Properties

Capacity for being cold worked Poor
Capacity for being hot formed Good
Machinability rating (Free Cutting Brass=100) 70
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.