C24000 (ASTM B36) Low Brass Alloy Data Specifications

Low Brass, named for its relatively low zinc content, is a choice of many design engineers for applications where strength and formability are required. Due to the higher content of zinc found in this alloy, compared to Red Brass it develops a beautiful antique brass color when chemically treated making it ideal from many decorative or architectural applications. Other advantages of C240 include: high solderability, high fatigue limit, and excellent grain size control. 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 78.5-81.5%
Zinc Remainder
Lead 0.05% max
Iron 0.05% max

1Copper plus named elements, 99.8% min

 

Physical Properties

  English Units Metrics Units
Density 0.313 lb/in3 @ 68oF 8.66 g/cm3
Thermal Conductivity 81 BTU-ft/ft2-hr-oF 139 W/mK
Electrical Resistivity 32.4 ohm circ mils/ft 5.39 microhm-cm
Electrical Conductivity (annealed) 32% IACS* 0.186 megamho/cm
Modulus of Elasticity 16,000,000 psi 110 kN/mm2
Coeff. of Thermal Expansion
  68-572oF (20-300oC) 10.6 PPM/oF 19.1 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 44-54 305-370 20 410 50 - -
1/4 Hard 48-58 330-400 29 200 26 - -
1/2 Hard 55-65 380-450 42 290 18 0.3 0.5
3/4 Hard 61-71 420-490 53 365 10 0.5 1.0
Hard 68-77 470-530 61 420 4 1.0 1.5
Extra Hard 78-87 540-600 68 470 2 1.5 2.8
Spring 85-93 585-640 76 525 1 min 3.0 4.5
Extra Spring 89-97 615-670 78 540 1 max

1Mechanical properties subject to change. All rolled-tempers listed 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.