C26800 (ASTM B36) Yellow Brass Alloy Data Specifications

Yellow Brass, as it is commonly known, is among the highest zinc-containing brasses available to designers. Exhibiting a handsome yellow color associated with brasses this alloy finds use in many of the same applications as other high brasses. C268 offers similar mechanical and physical properties to that of other brasses and is often found in applications requiring an economical copper-based alloy. Designers considering applications requiring a material capable of heavy deep drawing should consider alloy C260. 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 64.0-68.5%
Zinc Remainder
Lead 0.09% max
Iron 0.05% max

1Copper plus named elements, 99.7% min

Physical Properties

  English Units Metrics Units
Density 0.306 lb/in3 @ 68oF 8.47 g/cm3
Thermal Conductivity 67 BTU-ft/ft2-hr-oF 116 W/mK
Electrical Resistivity 38.4 ohm circ mils/ft 6.39 microhm-cm
Electrical Conductivity (annealed) 27% IACS* 0.157 megamho/cm
Modulus of Elasticity 15,000,000 psi 105 kN/mm2
Coeff. of Thermal Expansion
  68-572oF (20-300oC) 11.3 PPM/oF 20.3 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 44-61 305-420 23 160 52 - -
1/4 Hard 49-59 340-405 34 235 42 - -
1/2 Hard 55-65 380-450 44 305 36 0.3 0.5
3/4 Hard 62-72 425-495 53 365 25 0.5 1.0
Hard 68-78 470-540 57 395 19 1.0 1.5
Extra Hard 79-89 545-615 67 460 7 1.5 2.3
Spring 86-95 595-655 71 490 5 2.0 4.5
Extra Spring 90-99 620-685 73 505 5 max

1Mechanical properties subject to change. All rolled-tempers are accepted or rejected bsed 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.