C65400 (ASTM B96) Ultronze Alloy Data Specifications

Ultronze or C654 is a silicon bronze that is an excellent candidate for many conventional applications such as terminals, connectors, springs diaphragms, fasteners, lock washers, clamps, etc. The combination of strength, formability, and stress relaxation resistance offered by this alloy exceeds that of most common copper alloys and also makes it highly suitable for a wide variety of specialized applications including semiconductor lead-frames and electronic connectors. 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
Chromium 0.01-0.12%
Silicon 2.7-3.4%
Tin 1.2-1.9%
Lead 0.05% max
Zinc 0.50% max

1Copper plus named elements, 99.5% min

Physical Properties

  English Units Metrics Units
Density 0.309 lb/in3 @ 68oF 8.55 g/cm3
Thermal Conductivity 21.0 BTU-ft/ft2-hr-oF 36 W/moK
Electrical Resistivity 148 ohm circ mils/ft 24.6 microhm-cm
Electrical Conductivity (annealed) 7% IACS* 0.041 megamho/cm
Modulus of Elasticity 17,000,000 psi 117 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) 9.7 PPM/oF 17.5 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
1/4 Hard 75-90 515-620 60 415 33 - 1.0
1/2 Hard 86-101 595-695 79 545 23 0.50 2.0
3/4 Hard 97-112 670-770 92 635 13 1.0 3.0
Hard 108-120 745-825 101 695 6 2.0 3.8
Extra Hard 116-126 800-870 109 750 4 2.5 4.5
Spring 124-133 855-915 117 805 3 3.0 7.0
Extra Spring 131-140 905-965 124 855 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.