bedra93200

High Leaded Tin Bronze

Characteristics：

bedra93200 is a continuous cast leaded tin bronze alloy. It exhibits excellent machinability while maintaining favorable thermal conductivity and good lubricity due to its lead content. It is one of the most popular general-purpose bearing alloys, valued for its strength, hardness, and shock resistance. This alloy is particularly suitable for heavily loaded, lubricated, and true-running bearings.

Typical applications:

bedra93200 is widely used in automotive fittings, thrust washers, machinery components, pumps, valves, and a wide range of bushings and bearings.

Standardization and composition

UNS	C93200 (SAE 660)
EN	CuSn7Zn4Pb7 (CB493K)
JIS	/
GB	ZQSn7-7-3
Cu	81-85%
Pb	6.0-8.0%
Sn	6.3-7.5%
Zn	1.0-4.0%
P	≤ 0.15%
Ni	≤ 1.0%
Fe	≤ 0.2%

Physical properties①

Note①：The testing temperature is 20℃. Note②：The testing temperature range is 20℃ to 300℃.

Density (g/cm³)	8.91
Metling temperature (℃)	977
Electrical conductivity (%IACS)	12
Thermal conductivity (W / m x K)	58.2
Coefficient of thermal expansion② (10-6/K)	17.3
Modulus of elasticity (GPa)	100

Fabrication Properties

Note③：C36000 = 100%

Cold workability	Good
Hot workability	Poor
Brazing	Good
Resistance welding	Not recommended
Machinability rating③	70%

Mechanical Properties

Temper	Diameter (mm)	Tensile Strength (MPa min.)	Yield Strength (MPa min.)	Elongation (% min.)	Hardness (HBW min.)
M07	15 ≤ Ф 12	245	140	10	65

Dimension Tolerance and Delivery Form

Note④：The tolerances listed in the table are specified as all plus or all minus. When tolerances are specified as plus and minus (±), half the values given.

			Straight bar
Diameter (mm)	Tolerance④ (mm)	Ovality (mm max.)	Length (mm max.)	Straightness (mm/m max.)
15≤Φ＜30	0.10	0.05	4000	0.5
30≤Φ＜60	0.20	0.10	4000	0.5
60≤Φ＜80	1.0	0.50	4000	1.0
80≤Φ≤100	1.6	0.80	3000	1.0