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METALCO supplies copper, brass, and bronze semi-finished products for OEMs and distributors worldwide — with documented quality, export packing, and technical support you can rely on.

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C544 Phosphor Bronze - Grade B

Bronze Rods / C544 Phosphor Bronze - Grade B

C544 Phosphor Bronze Grade B is a premium bronze alloy engineered for applications requiring excellent wear resistance, corrosion protection, and high fatigue strength. With superior machinability and low-friction properties, it is ideal for bushings, bearings, gears, springs, electrical connectors, marine equipment, and heavy-duty industrial engineering components.

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Description
Chemical Composition
Physical Properties
Sizes Available

Bronze Family: Leaded Phosphor Bronze
C 544 Phosphor Bronze – Grade B is a METALCO standard alloy and finds use in electrical applications, as well as many industrial applications. It is used as electrical connectors and partially due to its excellent machinability finds use as bushings, gears, pinions, screw machine products, thrust washers, valve parts, and shafts.

Specification :
Phosphros Bronze	ASTM B103 C 51000 SAE J 463 C 51000 BS 2874 PB 102

Equivalent Specifications*

ASTM B139
B139M
Copper Alloy UNS C54400

Reference Specifications*

SAE J461
SAE J463
ASTM B103

* Equivalent specifications are verified and updated annually.
Specifications shown are current as of May 4, 2010.

Chemical Composition (%)
Cu	Sn	P	Fe	Pb	Zn
Remainder	3.5 – 4.5	0.01 – 0.50	0.10 max.	3.0 - 4.0	1.5 – 4.5
Sum of all named elements = 99.5%

Mechanical Properties Minimum Tensile Properties, English/Metric
Temper HO4 hard
Nominal Diameter	Tensile Strength		Elongation**
Inches/mm	ksi	MPa	%
¼"– ½" incl./6 - 12 mm. incl.	60	415	10
Over ½" to 1" incl./12-25 mm incl.	55	380	12
Over 1.00"/25 mm	50	345	15

Elongation in 4D
Chemical Composition and Mechanical Properties shown pertain to ASTM B139/B139 M only.

Machinability Rating 80 (Free Cutting Brass = 100)

Physical Properties
	English	Metric
Melting Point – Liquidus	1830° F	999° C
Melting Point – Solidus	1700° F	927° C
Density	0.320 lb/in3 at 68° F	8.89 gm/cm3 @ 20° C
Specific Gravity	8.890	8.89
Electrical Resistivity (Annealed)	54.60 ohms-cmil/ft @ 68° F	9.08 microhm-cm @ 20° C
Electrical Conductivity (Annealed)	19%IACS @ 68° F	0.111 MegaSiemens/cm @ 20° C
Thermal Conductivity	50 Btu · ft/(hr · ft2·°F) @ 68° F	86.5 W/m·°K @20° C
Coefficient of Thermal Expansion	9.60 · 10−6 per °F (68-572° F)	17.3 ·10−6 per °C (20-300° C)
Specific Heat Capacity	0.090 Btu/lb/°F @ 68° F	377.1 J/kg · °K @293° K
Modulus of Elasticity in Tension	15,000 ksi	103,400 MPa

Physical Properties provided by CDA

Fabrication Practices
Soldering	Excellent	Capacity for Being Cold Worked	Good
Brazing	Good
Oxyacetylene Welding	Not Recommended	Annealing Temperature – Minimum	900° F or 483° C
Gas Shielded Arc Welding	Not Recommended	Annealing Temperature – Maximum	1250° F or 677° C
Coated Metal Arc Welding	Not Recommended
Resistance Welding – Spot	Not Recommended
Resistance Welding – Seam	Not Recommended
Resistance Welding – Butt	Fair