Brass Copper Castings India
Leaded Naval Brass Alloy C48500

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


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/ºF @ 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
Oxyacetylene Welding/Not Recommended
Gas Shielded Arc Welding/Not Recommended
Coated Metal Arc Welding/Not Recommended
Resistance Welding Spot/Not Recommended
Seam/Not Recommended