Copper (UNS C50710)

May 24 2013

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication
Applications

Introduction

The Unified Numbering System (UNS) is a designation system formed by American Society for Testing Materials (ASTM) and Society of Automotive Engineers (SAE). UNS designations C50100 to C54200 are called phosphor bronzes.

Phosphor bronzes are known to possess high fatigue resistance, excellent formability and solderability, and high corrosion resistance. Copper UNS C50710 alloy is a phosphor bronze.

The following datasheet discusses the chemical composition and properties of copper UNS C50710.

Chemical Composition

The chemical composition of copper UNS C50710 is given in the following table.

Element Content (%)
Copper, Cu 97.7
Tin, Sn 1.7 - 2.3
Phosphorous, P ≤ 0.35
Nickel, Ni 0.10 - 0.40

Physical Properties

The following table discusses the physical properties of copper UNS C50710.

Properties Metric Imperial
Density 8.88 g/cm3 0.321 lb/in3
Melting point 995-1065 °C 1820-1949 °F

Mechanical Properties

The mechanical properties of UNS C50710 copper strip (H02-temper) are tabulated below.

Properties Metric Imperial
Tensile strength 455 MPa 66000 ksi
Modulus of elasticity 113 GPa 16400 ksi
Elongation at break 25% 25%
Hardness, Vickers 150 150

Thermal Properties

The thermal properties of UNS C50710 copper strip (H02-temper) are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-550°C/68-1020°F) 17 µm/m°C 9.44 µin/in°F
Thermal conductivity (@20°C/68°F) 154 W/mK 1070 BTU in/hr.ft².°F

Fabrication

Copper UNS C50710 alloy has good to excellent corrosion resistance, excellent cold workability, and good hot formability. This alloy can be fabricated using several methods such as blanking, heading, bending, and upsetting, shearing and swaging.

Applications

Copper UNS C50710 finds application in:

  • Valve spindles
  • Lead frames
  • Shafts
  • Gears and bearings

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