C51180 (ASTM B103) Alloy Data Specifications

Olin Brass Alloy C51180 is a dispersion and solid solution strengthened alloy developed for use in the electronic and automotive connector market. It offers users, or those considering alloy C52100, the same or better forming characteristics with higher electrical conductivity. Designers looking for a material with an edge over traditional phosphor bronze alloys will find a solution in C51180. For more information contact Olin Brass Market Development Engineering at 618-258-5255, OlinBrass.com or email us at info@olinbrass.com.

Chemical Composition

Copper1 Remainder
Tin 3.5-4.9%
Iron 0.05-0.20%
Nickel 0.05-0.20%
Phosphorus 0.01-0.35%
Zinc 0.30% max
Lead 0.05% max

1Copper plus named elements, 99.5% min

Physical Properties

  English Units Metrics Units
Density 0.321 lb/in3 @68oF 8.89 g/cm3
Thermal Conductivity 50 BTU-ft/2-hr-oF 86 W/moK
Electrical Resistivity 51.85 ohm circ mils/ft 8.62 microhm-cm
Electrical Conductivity (annealed) 20% IACS* 0.120 megamho/cm
Modulus of Elasticity 16,000,000 psi 110 kN/mm2
Coeff. of Thermal Expansion
  68-572oF (20-300oC) 9.9 PPM/oF 17.8 PPM/oC

*International Annealed Copper Standard

Mechanical Properties

Temper1 Tensile Strength Yield Strength2 % Elongation2 Typical 90o Bend Formability GW/BW3
ksi N/mm2 ksi N/mm2
1/2 Hard 69-84 475-580 70 480 22 - -
3/4 Hard 80-92 550-635 82 565 18 - 0.5
Hard 85-100 585-690 87 600 18 0.3 1.5
Extra Hard 97-112 670-770 101 695 8 0.6 2.8
Spring 105-119 725-820 107 740 5 1.2 4.0
Extra Spring 110-122 760-840 112 770 3

1Mechanical properties subject to change. All tempers listed are made to a Tensile Strength specification unless otherwise noted.
2Nominal Values.

3DATA FOR REFERENCE ONLY. R/T = Bend Radius/Material Thickness <0.016" (0.4mm) thick, 11/16 (17.5mm) wide.
4Relief annealed product recommended for maximum formability.