Copper Alloys, Phosphor & Leaded BronzeCW451K (PB102) Bar & Sheet

Most widely used grade of wrought phosphor bronze for an extensive range of general purpose applications.

CW451K/PB102 is the most widely used wrought phosphor bronze in the UK. It contains additions of 5% tin and up to 0.4% phosphorus to enhance its wear resistance, mechanical strength and stiffness and corrosion resistance.

The 5% tin containing alloy offers superb spring qualities, a high fatigue resistance, excellent cold forming properties and a corrosion resistance almost equivalent to aluminium bronzes in many atmospheric conditions.

PB102/CW451K also offers a reasonable machinability (20-25% that of free machining brass =100%), with an excellent soldering, brazing and butt welding capability. It can also be joined reasonably easily using spot welding and gas shielded arc welding, seam welding and coated metal arc welding.

PB102/CW451K is an extremely versatile alloy which can be used across a wide range of general engineering applications.

Range

Product Form	Size Range
Round Bar	⁵⁄₃₂" - 4 ¹⁄₂" diameter

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Related Specifications

CW451K/PB102 bronze corresponds to the following designations but may not be a direct equivalent:

UNS C51000
ISO CuSn5

Properties

Chemical Composition

Chemical Element	% Present
Tin (Sn)	4.50 - 5.50
Iron (Fe)	0.00 - 0.10
Lead (Pb)	0.00 - 0.02
Nickel (Ni)	0.00 - 0.20
Others (Total)	0.00 - 0.20
Phosphorous (P)	0.01 - 0.40
Zinc (Zn)	0.00 - 0.20
Copper (Cu)	Balance

Mechanical Properties

Mechanical Property	Value
Proof Stress	240-670 MPa
Tensile Strength	400-720 MPa
Elongation A50 mm	2-45 %
Hardness Vickers	75 to 230 HV

General Physical Properties

Physical Property	Value
Density	8.85 g/cm³
Melting Point	930 °C
Modulus of Elasticity	121 GPa
Thermal Conductivity	63 W/m.K
Electrical Resistivity	0.096 x 10^-6 Ω .m

Applications

Gears
Connectors & switches
Bushes & bearings
Marine applications
Aircraft applications
Chemical applications
Springs
Architectural & decoratve components

Characteristics

Good mechanical properties
Excellent cold forming properties
High wear resistance
Very good corrosion resistance
Easily joined by brazing and welding
Low coefficient of friction
Good spring properties

Additional Information

Weldability

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Disclaimer

This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon. Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed S online) and manufacturers' data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources. Material supplied by the Company may vary significantly from this data but will conform to all relevant and applicable standards. As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied. Advice given by the Company to any third party is given for that party's assistance only and without liability on the part of the Company. All transactions are subject to the Company's current Conditions of Sale. The extent of the Company's liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.