C21000 (ASTM B36) Gilding Metal Alloy Data Specifications

Known as Gilding Metal, C210 is well known for its historic use in the penny. This versatile, low-cost alloy is often the choice of engineers for applications including deep drawn parts such as bullet jackets and coined products. The combination of moderate conductivity and improved strength make C210 a valuable option for electrical applications where performance requirements preclude the use of standard cooper. 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 94.0-96.0%
Zinc Remainder
Lead 0.05% max
Iron 0.05% max

1Copper plus named elements, 99.8%

 

Physical Properties

  English Units Metrics Units
Density 0.320 lb/in3 @ 68oF 8.86 g/cm3
Thermal Conductivity 135 BTU-ft/ft2-hr-oF 233 W/mK
Electrical Resistivity 18.5 ohm circ mils/ft 3.08 microhm-cm
Electrical Conductivity (annealed) 56% IACS* 0.325 megamho/cm
Modulus of Elasticity 17,000,000 psi 117 kN/mm2
Coeff. of Thermal Expansion
  68-572oF (20-300oC) 10.0 PPM/oF 18.1 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
Anneald (Soft)4 34-40 235-275 10 70 45 - -
1/4 Hard 37-47 255-325 30 205 30 - -
1/2 Hard 42-52 290-360 44 305 17 - -
3/4 Hard 46-56 315-385 50 345 9 - -
Hard 50-59 345-405 53 365 5 - 0.5
Extra Hard 56-64 385-440 59 405 2 Max 0.5 1.0
Spring 60-68 415-470 63 435 2 Max 1.0 4.8
Extra Spring 61-69 420-475 64 440 2 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.