Copper UNS C50715 Alloy - Phosphor Bronze

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties


The Unified Numbering System (UNS) designation comprises five digit numbers preceded by a letter prefix. The letter indicates the identified metal family. UNS C50715 is a copper alloy.

The copper alloy series are classified based on the key metals added into the composition. For example UNS C50000 to UNS C59999 is known as phosphor bronzes, as the key metals are phosphorus and tin.

Copper UNS C50715 alloy is a low alloyed tin bronze. Iron and phosphorus present in its composition stabilize the conductivity, strength, formability, and stress relaxation resistance. The following datasheet discusses the chemical composition and properties of copper UNS C50715.

Chemical Composition

The chemical composition of copper UNS C50715 is given in the following table.

Element Content (%)
Tin, Sn 1.7-2.3
Iron, Fe 0.05-0.15
Lead, Pb 0.02
Phosphorous, P 0.025-0.04
Copper, Cu Balance

Physical Properties

The following table discusses the physical properties of copper UNS C50715.

Properties Metric Imperial
Density 8.9 g/cm3 0.323 lb/in3

Mechanical Properties

The mechanical properties of UNS C50715 copper flat products (H02-temper) are tabulated below.

Properties Metric Imperial
Tensile strength 393 MPa 57 ksi
Elastic modulus 121 GPa 17549 ksi
Elongation 15% 15%

Thermal Properties

The thermal properties of copper UNS C17410 are tabulated below.

Properties Metric Imperial
Thermal conductivity 140 W/mK 970 BTU in/hr.ft².°F


Copper UNS C50715 is used in the following applications:

  • In electrical sector: contact springs, miniaturized connectors, terminals, fuse clips switch parts, and electronic connectors
  • In architecture: bridge bearing plates
  • In industrial sector: clutch disks, textile machinery, beater bar, perforated sheets, bellows, springs, sleeve bushing, chemical hardware, lock washers and fasteners.
  • In automotive sector – for applications at relatively high ambient temperatures
  • General commodities such as connectors, stamped parts, ultra high strength spring elements, switch elements, membranes, and fixed contacts.

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