Phosphor bronze is a copper alloy containing both tin and phosphorus. It’s a highly-valuable, specialty metal with many positive attributes. Here are the properties and characteristics that make phosphor bronze a sought-after alloy. Phosphor bronze sheet is predominantly used for electrical purposes, due to its high-wear resistance, high-fatigue resistance, excellent forming properties and also due to the ease it can be welded.

Specifications of Phosphor Bronze Sheets

PB102

CW451K

C51000

DEF STAN 02-838

NES 838

ISO CuSn5

Physical Properties of Phosphor Bronze Sheets

Density

8.85 gm/cm3

Melting Point

1050*C

Thermal Conductivity

69 W/m*C

Coeff. of Thermal Expansion 20-300*C

17.8 x 10-6

Electrical Conductivity 20*C

15% IACS

Specific Heat

377 J/Kg*K

Mechanical Properties of Phosphor Bronze Sheets

Tensile Strength

460N/mm²

0.2% Proof Stress

380N/mm²

Elongation

Fabrication Properties of Phosphor Bronze Sheets

Fabrication Properties of Phosphor Bronze Sheets​

675-745*C

Stress Relieving temperature

200-350*C

Hot formability

Limited

Cold Formability

Excellent

Machinability Rating

20% 

Joining Methods of Phosphor Bronze Sheets

Soldering

Excellent

Brazing

Excellent

Gas shielded arc welding

Good

Coated metal arc welding

Fair

Resistance welding: Spot

Good

Seam

Fair

Butt

Excellent

Applications of Phosphor Bronze Sheets

Roofing/Flashing

Shafts and Gears

Valve Parts

Electrical Springs

Marine and Chemical Hardware

Spring Washers

Electrical Connectors and Switches

Decorative Items

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