C42520 (ASTM B591) Alloy Data Specifications

Olin Brass Alloy C4252 is a dispersion and solid strengthened alloy developed for use in the electronic and automotive connector market. It was developed to provide a cost-effective solution to the increasing price pressures placed upon connector manufactures using traditional phosphor bronze alloys. Its unique combination of properties provides higher current carrying capacity than Alloy C510 at the same strength. 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 88.0-91.0%
Tin 1.5-3.0%
Iron 0.05%-0.20%
Nickel 0.05-0.20%
Phosphorus 0.01-0.20%
Zinc Remainder
Lead 0.05% max

1Copper plus named elements, 99.7% min

Physical Properties

  English Units Metrics Units
Density 0.318 lb/in3 @ 68oF 8.80 g/cm3
Thermal Conductivity 70 BTU-ft/ft2-hr-oF 120 W/moK
Electrical Resistivity 34.57 ohm circ mils/ft 5.75 microhm-cm
Electrical Conductivity (annealed) 30% IACS* 0.170 megamho/cm
Modulus of Elasticity 16,000,000 psi 110kN/mm2
Thermal Capacity (Specific Heat) 0.090 Btu/lb/Fo @68oF 0.090 cal/gm/Co @ 20oC
Coeff. of Thermal Expansion
  68-572oF (20-300oC) 10.2 PPM/oF 17.4 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 58-73 400-505 60 415 20 - -
3/4 Hard 68-79 470-545 71 490 15 - -
Hard 76-91 525-625 81 560 10 - 0.5
Extra Hard 88-103 605-710 92 635 6 0.5 1.8
Spring Hard 95-110 655-760 100 690 4 1.0 3.0
Extra Spring 100-114 690-785 103 710 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.