Skip to content

HPM® 80/20 A

HPM® 80/20 A is a resistance alloy used in electric heating applications. It is recommended for use in dry air applications up to 2150°F with good hot strength.

The alloy forms rather well and has good welding characteristic. Caution should be used to avoid extended exposure to elevated temperature in marginally oxidizing or partially reducing atmospheres as it would be susceptible to “green rot” corrosion, carburization and sulfurization.

Available Sizes:

HPM® 80/20 A is available from Hamilton Precision Metals as strip product in thicknesses from 0.0005” to 0.050” (0.0127 mm to 1.27 mm) and width up to 12” (304.8 mm). The material conforms to ASTM B-344. Foil product may be supplied in thickness to 0.0001” (0.00254 mm) in width up to 4.0” (101.6 mm).

Nominal Composition
HPM® 80/20 A NOMINAL COMPOSITION
Chromium 19.5%
Silicon 1.25%
Iron 0.50%
Manganese 0.40%
Nickel Balance


Mechanical Properties
HPM® 80/20 A MECHANICAL PROPERTIES
ANNEALED COLD ROLLED
Ultimate Tensile Strength 105,000 PSI 190,000 PSI
Yield Strength (0.2% Offset) 50,000 PSI 185,000 PSI
Elongation in 2” * 35% 1%
Modulus of Elasticity (Tension) 31 X 106 PSI -

*The measured elongation will be less as thickness decreases to 0.002” and less.
These values may be adjusted by control of process variables – consult HPM for desired values.


Physical Properties
HPM® 80/20 A PHYSICAL PROPERTIES
Density 0.304 lbs./cu.in.
Melting Point (Approx. 1400°C
Electrical Resistivity @ R.T. 108 Microhm·cm
Temperature Coefficient of Resistivity (TCR) (25° to 105°C) 100 ppm/°C
Thermal Expansion Coefficient (20° to 100°C) 13.4 x 10-6/°C
Thermal Conductivity @ 100°C 13.4 W/m·K
Magnetic Attraction None
Specific Heat 0.104 gram· cal./°C

Typical values to guide alloy selection but are not a guarantee of minimum or maximum.