C19720 (ASTM B465) Alloy Data Specifications

Olin Brass Alloy C19720 is a dispersion strengthened, high conductivity copper alloy with mechanical and physical properties identical to Olin Brass C19700. C19720 was developed by modifying the chemistry of C197 in order to produce an alloy with improved reliability at elevated temperatures. C197 performs well up to 115°C, however, C19720 will maintain at least 70% of its initial stress after exposure to 125°C for 3000 hours and 150°C for 1000 hours. C19720 is an ideal fit for active contact applications in automotive power distribution where high current-carrying capability and good strength are required. 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
Iron 0.05-0.50%
Magnesium 0.06-0.20%
Phosphorus 0.05-0.15%
Tin 0.20% max
Zinc 0.20% max
Nickel 0.10% max
Lead 0.05% max
Manganese 0.05% max

1Copper plus named elements, 99.5%

Physical Properties

  English Units Metrics Units
Density 0.319 lb/in3 @ 68oF 8.84 g/cm3
Thermal Conductivity 185 BTU-ft/ft2-hr-oF 320 W/moK
Electrical Resistivity 13 ohm circ mils/ft 2.16 microhm-cm
Electrical Conductivity (annealed) 80% IACS* 0.464 megamho/cm
Modulus of Elasticity 17,200,000 psi 118 kN/mm2
Thermal Capacity (Specific Heat) 0.090 Btu/lb/Fo @ 68 oF 377.1 J/kg - oK @ 293oK
Coeff. of Thermal Expansion
  68-212oF (20-100oC) 9.60 PPM/oF 17.28 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 53-63 365-435 48 330 17 0.5 0.5
Hard 60-70 415-480 60 415 7 0.8 0.8
Extra Hard 67-73 460-505 67 460 6 1.2 1.2

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.