Typical Applications Wear resistant and corrosion-resistant parts: bearing shells, liners, cylinder liners, piston clutches, pump pressure covers, etc.
Elastic conductive element: spring contact piece
Aviation industry: springs, connecting rods, etc. for various altimeters and speedometers
Other application areas: precision instrument gears, brush boxes, contactors, etc
Chemical composition

Copper Cu	Margin	Wt%
Tin Sn	7.0~9.0	Wt%
Phosphorus P	0.03-0.35	Wt%
Iron Fe	≤ 0.1	Wt%
Zinc	≤ 0.2	Wt%

Physical performance

Melting point	1020	° C
Density	8.8	g/cm3
Conductivity	60	% IACS
Thermal conductivity k	12	W/m/k
Thermal expansion coefficient	17.5	μ M/m/° C
Elastic modulus	110	Gpa

Mechanical properties

Status	Bar specification (mm)	Tensile strength (MPa)	Yield strength (MPa)	Elongation rate (%)	Hardness (HRB)
R450	Φ 7-20	≥ 450	≥ 280	≥ 24	≥ 135
R550	Φ 20~70	≥ 550	≥ 400	≥ 15	≥ 160