OCr21Al4

Alloy Category: High Electrical Resistance Alloy Base Material Shape: Wire (Round/Flat Wire) Alloy Series: Nickel-Chromium Alloy Implementation Standard: GB/T1234-2012

Category：

Iron chromium series

Keywords：High resistance electric heating alloy | Corrosion-resistant alloy | Thermal spraying materials

Message

OCr21Al4

Iron-chromium-aluminum resistance alloys are characterized by high resistivity, low temperature coefficient of resistance, and high operating temperature.

High resistivity

The characteristics of iron-chromium-aluminum resistance alloys are high resistivity, low temperature coefficient of resistance, and high operating temperature.

Low temperature coefficient of resistance

The characteristics of iron-chromium-aluminum resistance alloys are high resistivity, low temperature coefficient of resistance, and high operating temperature.

High operating temperature

The characteristics of iron-chromium-aluminum resistance alloys are high resistivity, low temperature coefficient of resistance, and high operating temperature.

Low price

And it is inexpensive, making it an ideal heating material for industrial furnaces, household appliances, and far-infrared devices.

It has good corrosion resistance at high temperatures, especially suitable for use in atmospheres containing sulfur and sulfides, and is inexpensive, making it an ideal heating material for industrial furnaces, household appliances, and far-infrared devices.

Chemical Composition

Alloy Grade	Chemical Composition (mass fraction)/%
	C	P	S	Mn	Si	Cr	Ni	Al	Fe	RE
	Not more than
OCr21A4						17.0～21.0		2.0-4.0	Balance	Balance

Physical Properties

Alloy Grade	Maximum operating temperature of element ℃	Melting point (approximate) ℃	Density g/cm³	Resistivity (20 ℃) μΩ ·m	Specific heat capacity J/(g·K	Thermal conductivity (20 ℃) W/(m·K)	Average linear expansion coefficient α (20℃~1000 ℃) 10-*/K	Structure	Magnetic
OCr21A4	1100	1500	7.35	1.23+0.06	0.49	47	13.5	Ferrite	Magnetic

Mechanical Properties

Alloy Grade	Alloy State	Tensile strength Rm/MPa Not less than	Elongation A/% Not less than
			Diameter > 3.00 mm all wires and thickness > 0.200 mm nickel-chromium strip	Diameter 0.10 mm～3.00 mm all wires and thickness > 0.200 mm iron-chromium-aluminum strip
OCr21A4	Annealed	637`784		12

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