C87200 / CDA 872 Copper Silicon Bronze Alloys

Casting Standards :

ASTM (B Series)	B584
SAE (J Series)	J462
Federal (QQ-C- Series)	390
Military (Mil-C- Series)	22229

Specification Composition :

	Minimum	Maximum
Copper (Cu)	89
Tin (Sn)		1
Lead (Pb)		0.5
Zinc (Zn)		5
Iron (Fe)		2.5
Antimony (SB)		8
Aluminum (Al)		1.5
Manganese (Mn)		1.5
Silicon (Si)	1	5

Specification Properties :

Heat Treat ‘F’ Denotes As Cast	Heat Treat State	Minimum
Tensile Strength (ksi)	F	45
Yield Strength (.5% extension under load) (ksi)	F	18

Typical Properties :

	Heat Treat State	Typical
Modulus of Elasticity (ksi)		15000
Hardness (Brinell) (HB @ 3000kg)		85
Machinability (% of free cutting brass)		40
Impact Strength (Izod) (ft-lb)		33
Shear Strength (ksi)		28
Compressive Strength (0.001 in. set/in.) (ksi)		18
Compressive Strength (0.010 in. set/in.) (ksi)		60
Melting Range (Liquidus-Solidus)(F)		1580-1780
Thermal Conductivity (Btu/sq.ft/ft./hr/F @ 68F)		16.4
Specific Heat (Btu/lb/F @ 68F)		0.09
Electrical Conductivity (% IACS @ 68F)		6
Density (lb/cu.in. @ 68F)		0.302
Patternmakers Shrinkage (in/ft)		1/4
Drossing		Low
Gassing		High
Fluidity		High
Elongation (2 inch gauge length) (%)	F	30