bedra54440

Leaded Phosphor Bronze

Characteristics：

bedra54400 is a phosphor bronze characterized by high machinability, toughness, strength and low coefficient of friction. The tin content enhances corrosion resistance and strength, while phosphorus refines the grain structure and improves wear resistance and stiffness. The addition of lead imparts free-machining properties compared to conventional bronzes.

Typical applications:

bedra54400 is suitable for communication connectors, automobiles, heavy machinery, and other industrial precision components—such as bushings, discs, and bearings—where lubrication access is difficult.

Standardization and composition

UNS	C54400
EN	CuSn4Pb4Zn4 (CW456K)
JIS	C5441
GB	T53500 (QSn4-4-4)
Cu	balance
Pb	3.0-4.0%
Sn	3.5-4.5%
Zn	1.5-4.5%
P	0.01-0.5%
Fe	≤ 0.1%

Physical properties①

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

Density (g/cm³)	8.89
Metling temperature (℃)	999
Electrical conductivity (%IACS)	19
Thermal conductivity (W / m x K)	87
Coefficient of thermal expansion② (10-6/K)	16.6
Modulus of elasticity (GPa)	103.4

Fabrication Properties

Note③：C36000 = 100%

Capacity for being cold worked	Good
Capacity for being hot formed	Poor
Brazing	Good
Resistance welding	Not recommended
Machinability rating③	80%

Mechanical Properties④

Note④：bedra technical standards

Temper	Diameter (mm)	Tensile Strength (MPa)	Yield Strength (MPa min.)	Elongation (% min.)	Hardness (HV5 min.)
H04	16 ≤ Ф 25	380	300	12	130
H04	25 ≤ Ф ≤ 50	345	280	15	120

Dimension Tolerance and Delivery Form

Note⑤：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)	Tolerance⑤ (mm)	Ovality (mm)	Length (mm. max.)	Straightness (mm/m max.)
16 ≤ Φ 20	0.07	0.04	4000	0.5
20 ≤ Φ 30	0.10	0.05	4000	0.5
30 ≤ Φ 50	0.16	0.08	4000	1.0