CDA 857 Yellow Brass Alloys

Specification :

CDA ASTM Asarcon SAE AMS Federal Military Other
C857 B505
B505M
QQ-C-390, A1;
QQ-B-621, CLASS A
MIL-C-15345, ALLOY 3 Leaded Naval Brass

Chemical Composition :

Cu%1 Pb% Sn% Zn% Fe% Ni%2 Al% Si%
Chemical Composition according to ASTM B505/B505M-18
1In determining Cu min., Cu may be calculated as Cu + Ni.   2Ni value includes Co.
Single values represent maximums.
58.00-
64.00
0.80-
1.50
0.50-
1.50
32.00-
40.00
0.70 1.00 0.80 0.05

Machinability :

Copper Alloy UNS No. Machinability Rating Density (lb/in3 at 68 °F)
C857 80 0.304

Mechanical Properties :

Mechanical Properties according to ASTM B505/B505M-18
Tensile Strength, min Yield Strength, at .5% Extension Under Load, min Elongation, in 2in. or 50mm min Brinell Hardness (500 kg load) Remarks
ksi MPa ksi MPa % typical BHN
40 276 14 97 15 75

Physical Properties :

Physical Properties provided by CDA
US Customary Metric
Melting Point – Liquidus 1725 °F 941 °C
Melting Point – Solidus 1675 °F 913 °C
Density 0.304 lb/in3 at 68 °F 8.41 gm/cm3 at 20 °C
Specific Gravity 8.41 8.41
Electrical Conductivity 22% IACS at 68 °F 0.128 MegaSiemens/cm at 20 °C
Thermal Conductivity 48.5 Btu/sq ft/ft hr/°F at 68 °F 83.9 W/m at 20 °C
Coefficient of Thermal Expansion 68-572 12 · 10-6 per °F (68-572 °F) 20.7 · 10-6 per °C (20-300 °C)
Specific Heat Capacity 0.09 Btu/lb/°F at 68 °F 377.1 J/kg at 293 °C
Modulus of Elasticity in Tension 14000 ksi 87000 MPa
Magnetic Permeability 1 1

Fabrication Properties :

Fabrication Properties provided by CDA
Joining Technique Suitability
Soldering Good
Brazing Fair
Oxyacetylene Welding Not Recommended
Gas Shielded Arc Welding Not Recommended
Coated Metal Arc Welding Not Recommended