C26000 (ASTM B36) Cartridge Brass Alloy Data Specifications

The "work-horse" of all copper alloys, Cartridge Brass as it is often termed can be readily formed into thousands of different parts and has the strength to perform many useful functions. The unique properties of C260 have allowed this alloy to find application in everything from bullet cases and automotive terminals to door trim and even jewelry. With a warm yellow color and ability to accommodate severe forming/drawing this alloy is one of the most versatile commercial metals. 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 68.5-71.5%
Zinc Remainder
Lead 0.07% max
Iron 0.05% max

1Copper plus named elements, 99.7% min

Physical Properties

  English Units Metrics Units
Density 0.308 lb/in3 @ 68oF 8.53 g/cm3
Thermal Conductivity 70 BTU-ft/ft2-hr-oF 121 W/mK
Electrical Resistivity 37.0 ohm circ mils/ft 6.16 microhm-cm
Electrical Conductivity (annealed) 28% IACS* 0.162 megamho/cm
Modulus of Elasticity 16,000,000 psi 112 kN/mm2
Coeff. of Thermal Expansion
  68-572oF (20-300oC) 11.1 PPM/oF 19.08 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 (Soft)4 45-61 310-420 21 145 53 - -
1/4 Hard 49-59 340-405 33 230 46 - 0.3
1/2 Hard 57-67 395-460 51 350 30 0.5 0.5
3/4 Hard 64-74 440-510 62 425 16 1.0 1.3
Hard 71-81 490-560 72 495 10 1.3 1.8
Extra Hard 83-92 570-635 83 570 3 1.8 3.0
Spring 91-100 625-690 86 595 1 min 3.0 5.0
Extra Spring 95-104 655-755 89 615 1 min

1Mechanical properties subject to change. All rolled-tempers are accepted or rejected based on Tensile Strength.
2Nominal Values in 2" (51mm)
3DATA FOR REFERENCE ONLY. R/T = Bend Radius/Material Thickness <0.016" (0.4mm) thick, 11/16 (17.5mm) wide.
4Annealed temper are manufactured to a grain size only, consult mill for additional info.