Copper and Copper Alloys - Phosphor & Leaded Bronze - CW451K Sheet and Bar

CW451K Sheet and Bar

Bronzes are Copper-based alloys with the major alloying elementbeing Tin. They offer a combination of properties such as high strength, hardness, corrosion resistance and wear resistance.

Bronze alloy CW451K/PB102 is a Phosphor Bronze. Phosphor Bronzes are alloys of Copper and Tin. PB102 has good corrosion resistance and is known for its high fatigue strength. It also shows a good combination of strength and ductility.

CW451K/PB102 is typically used in:
~ Gears
~ Worm Gears
~ Bushes
~ Marine applications
~ Aircraft applications
~ Chemical applications
~ Springs
CW451K/PB102 is the most widely used of the wrought phosphor bronzes.

Chemical Composition

Spec: EN 1652:1998


Chemical Element % Present
Tin (Sn) 4.50 - 5.50
Iron (Fe) 0.0 - 0.10
Lead (Pb) 0.0 - 0.02
Nickel (Ni) 0.0 - 0.20
Others (Total) 0.0 - 0.20
Phosphorous (P) 0.01 - 0.40
Zinc (Zn) 0.0 - 0.20
Copper (Cu) Balance


Physical PropertyValue
Density 8.85 g/cm³
Melting Point 930 °C
Modulus of Elasticity 121 GPa
Thermal Conductivity 63 W/m.K
Electrical Resistivity 0.096 x10^-6 Ω .m

Spec: EN 1652:1998

Sheet - 0.1mm to 5.00mm

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

Alloy Designations

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

UNS C51000



Supplied Forms

CW451K/PB102 is typically supplied as Drawn round rod, Plate and Hard sheet

  • Bar
  • Plate
  • Sheet

Corrosion Resistance

Alloy CW451K/PB102 has good corrosion resistance, almost equivalent to that displayed by the Aluminium Bronzes.

Cold Working

Cold working response of CW451K/PB102 is excellent.

Hot Working

Hot formability of CW451K/PB102 is poor.

Heat Treatment

Solution treatment or annealing of CW451K/PB102 can be done by rapid cooling after heating to 500-700°C.


The machinability rating of CW451K/PB102 is rated as poor at 20 compared to Brass CZ121/CW614N which is rated as 100.


Soldering, brazing and butt welding of CW451KPB102 are rated as excellent.

Oxyacetylene welding, seam welding and coated metal arc welding are rated as fair.

Spot welding and gas shielded arc welding are rated as good.

Datasheet Search

Last Datasheet Revision

18 July 2019


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 & 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.