Constantan® Strip And Foil
copper-nickel alloy, Constantan Strip and Foil, strain gauges
Description
Constantan® is a copper-nickel alloy that contains specific minor amounts of additional elements to achieve precise values for the temperature coefficient of resistivity. Careful control of melting and conversion practices results in a very low level of pinholes at ultra-thin thicknesses. The alloy is used extensively for foil resistors and strain gauges. The TCR can be adjusted from the furnished cold rolled values by using a low temperature heat treatment to achieve compensation for all types of spring elements. The foil is normally supplied with 90% cold reduction and a smooth bright surface. The foil is reasonably flat at 4” wide and nearly free of pinholes. The cold rolled foil can be produced with a TCR between +10 to –35 PPM/°C. The heat treatment will shift the foil TCR to the desired value. A typical heat-treat curve for Constantan® shows decreasing resistivity but increasing TCR with increased heat-treating temperature.
- Cold rolled steel strips
- strain gauges
- Constantan Strip and Foil
- copper-nickel alloy strip and foil products
Product characteristics
- Density
- 0.321 lbs/cu.in
- Melting Point (Approx.)
- 1210°C
- Electrical Resistivity @ R.T
- 50.8 Microhm·cm
- Temperature Coefficient of Resistivity (TCR) (25° to 105°C)
- ± 30 PPM/°C
- Thermal Expansion Coefficient (20°C to 100°C)
- 14.9 x 10-6/°C
- Thermal EMF vs. Copper (0°C to 100°C)
- -0.043 Millivolts/°C
- Thermal Conductivity R.T.
- 21.2W/m·K
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