CDA 903 Tin Bronze Alloys

Chemical Composition :

Cu%1 Pb% Sn% Zn% Fe% P%2 Ni%3 Al% S% Sb% Si%
Chemical Composition according to ASTM B505/B505M-18
1In determining Cu min., Cu may be calculated as Cu + Ni.  2For continuous castings, P shall be 1.5%, max. 3Ni value includes Co.
Note: Cu + Sum of Named Elements, 99.4% min. Single values represent maximums.
86.00-
89.00
0.30 7.50-
9.00
3.00-
5.00
0.20 0.05 1.00 0.005 0.05 0.20 0.005

Machinability :

Copper Alloy UNS No. Machinability Rating Density (lb/in3 at 68 °F)
C903 30 0.318

Mechanical Properties :

Mechanical Properties according to ASTM B505/B505M-18
Tensile Strength, min Yield Strength, at .5% Extension Under Load, min Elongation, in 2 in. or 50 mm min Brinell Hardness (500 kg load) Remarks
ksi MPa ksi MPa % typical BHN
44 303 22 152 18 70

Physical Properties :

Physical Properties provided by CDA
US Customary Metric
Melting Point – Liquidus 1832 °F 1000 °C
Melting Point – Solidus 1570 °F 854 °C
Density 0.318 lb/in3 at 68 °F 8.80 gm/cm3 at 20 °C
Specific Gravity 8.8 8.8
Electrical Conductivity 12% IACS at 68 °F 0.069 MegaSiemens/cm at 20 °C
Thermal Conductivity 43.2 Btu/sq ft/ft hr/°F at 68 °F 74.8 W/m at 20 °C
Coefficient of Thermal Expansion 68-392 10 · 10-6 per °F (68-392 °F) 17.3 · 10-6 per °C (20-200 °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 96527 MPa
Magnetic Permeability*