C22000 (ASTM B36) Commercial Bronze Alloy Data Specifications

Known for years as Commercial Bronze, this alloy derives its name from its rich bronze color. More a brass than an actually bronze, C220 offers a unique set of properties that make it great for applications requiring deep drawing and resistance to corrosion including values, buttons and pen ink tubes. Its appealing color also makes it ideal for architectural applications such as hinges, doorknobs, escutcheons and kick plates. 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 89.0-91.0%
Zinc Remainder
Lead 0.05% max
Iron 0.05% max

1Copper plus named elements, 99.8%

 

Physical Properties

  English Units Metrics Units
Density .0318 lb/in3 @68oF 8.80 g/cm3
Thermal Conductivity 109 BTU-ft/ft2-hr-oF 189 W/mK
Electrical Resistivity 23.6 ohm circ mils/ft 3.92 microhm-cm
Electrical Conductivity (annealed) 44% IACS* 0.255 megamho/cm
Modulus of Elasticity 17,000,000 psi 117 kN/mm2
Coeff. of Thermal Expansion
  68-572oF (20-300oC) 10.2 PPM/oF 18.36 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 36-42 250-290 12 85 47 - -
1/4 Hard 40-50 275-345 33 230 27 - -
1/2 Hard 47-57 325-395 47 325 12 - -
3/4 Hard 57-66 395-455 58 400 4 0.5 0.8
Hard 57-66 395-455 58 400 4 0.5 0.8
Extra Hard 64-72 440-495 63 435 2 1.0 1.3
Spring 69-77 475-530 68 470 1 min 1.5 2.0
Extra Spring 72-80 495-550 70 485 1 max

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.