Data Sheets

Copper and Copper Alloys   |   Phosphor & Leaded Bronze

CW451K Sheet and Bar

CommercialPB102 ENCW451K

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.

Applications
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

EN 1652:1998
CW451K
Chemical Element % Present
Copper (Cu) balance
Lead (Pb) 0.02 max
Iron (Fe) 0.1 max
Nickel (Ni) 0.2 max
Others (Total) 0.2 max
Zinc (Zn) 0.2 max
Phosphorous (P) 0.01 - 0.4
Tin (Sn) 4.5 - 5.5

Alloy Designations

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

UNS C51000

ISO CuSn5

 


Supplied Forms

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

  • Bar
  • Plate
  • Sheet

Generic 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 x10^-6 Ω .m

Mechanical Properties

EN 1652:1998
Sheet - 0.1mm to 5.00mm
Mechanical Property Value
Proof Stress 240-670 MPa
Tensile Strength 400-720 MPa
Elongation A50 mm 2-45 %
Hardness Vickers 75 to 230 HV

Mechanical values are variable depending on the condition of the material i.e. 1/2 hard, 1/4 hard etc. Mechanical values for bar are a typical average.


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.

Machinability

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

Weldability

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.