C51100 (ASTM B103) Alloy Data Specifications

 

A cost effective alternative to high tin containing phosphor bronze alloys, C511 offer designers many of the same performance advantage. Offering only slightly lower strength and higher conductivity than C510 or C521 this alloy is a great choice for applications requiring functional spring members including: relay contacts, electronic connector, automotive terminals and contacts springs. 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%
Phosphorus 0.03-0.35%
Lead 0.05% max
Iron 0.10% max
Zinc 0.30% max

1Copper plus named elements, 99.5% min

Physical Properties

  English Units Metrics Units
Density 0.320 lb/in3 @ 68oF 8.86 g/cm3
Thermal Conductivity 48.4 BTU-ft/ft2-hr-oF 86 W/moK
Electrical Resistivity 52.0 ohm circ mils/ft 8.7 microhm-cm
Electrical Conductivity (annealed) 20% IACS* 0.116 megamho/cm
Modulus of Elasticity 16,000,000 psi 110 kN/mm2
Thermal Capacity (Specific Heat) 0.090 Btu/lb/Fo @ 68oF 377.1 J/kg - oC @ 20oC
Coeff. of Thermal Expansion
  68-572oF (20-300oC) 9.90 PPM/oF 17.82 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
Annealed 46-54 315-370 22 150 47 - -
1/4 Hard 46-58 315-400 35 240 36 - -
1/2 Hard 55-70 380-485 56 385 21 - -
3/4 Hard 67-82 460-565 72 495 10 0.5 0.8
Hard 72-87 495-600 76 525 7 0.8 1.3
Extra Hard 84-99 580-685 88 605 3 1.3 2.0
Spring Hard 91-105 625-725 94 650 3 1.8 4.5
Extra Spring 96-109 660-750 98 675 2

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.