Cr30Ni70

Alloy Category: High Electrical Resistance Alloy Base Material Shape: Wire (Round/Flat Wire) Alloy Series: Nickel-Chromium Alloy Implementation Standard: GB/T1234-2012 Certification: ISO9001:2015

Category：

Nickel-chromium series

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

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Cr30Ni70

Nichrome, a nickel-chromium-iron resistance alloy wire, has a series of advantages, such as good high-temperature oxidation resistance, high strength, and no softening. It does not deform during prolonged use and has a very small permanent elongation.

High-temperature oxidation resistance

Good high-temperature oxidation resistance, with excellent overall properties.

High strength

High strength, with excellent overall properties.

No softening

No softening; during prolonged use, it does not deform and has a very small permanent elongation.

No deformation

During prolonged use, it does not deform and has a very small permanent elongation.

Among them, Cr30Ni70 alloy has excellent overall properties and is the preferred material for producing high-quality electric heating elements. Products are widely used in industrial furnaces, metallurgy, machinery, home appliances, and other industries to produce heating elements and resistance elements.

Chemical Composition

Alloy Grade	Chemical Composition (mass fraction)/%
	C	P	S	Mn	Si	Cr	Ni	Al	Fe	Others
	Not greater than
Cr30Ni70	0.08	0.020	0.015	0.60	0.75～1.60	28.0～31.0	Remainder	≤0.50	≤1.0	—

Physical Properties

Alloy Grade	Maximum Element Operating Temperature ℃	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 Properties
Cr30Ni70	1250	1380	8.10	1.18	0.46	14	17.0	Austenite	Non-magnetic

Mechanical Properties

Alloy Grade	Alloy State	Tensile Strength Rm/MPa Not less than	Elongation A/% Not less than
			All wire materials with diameter >3.00 mm and nickel-chromium strip materials with thickness >0.200 mm	All wire materials with diameter 0.10 mm～3.00 mm and iron-chromium-aluminum strip materials with thickness >0.200 mm
Cr30Ni70	Solid Solution	650	25	20

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