Nichrome 70 (UNS N06008 / W.Nr. 2.4658)

Nichrome 70 (UNS N06008 / W.Nr. 2.4658) is a nickel-chromium alloy (NiCr alloy) for use at temperatures up to 1250℃. The alloy is characterized by high resistivity and good oxidation resistance. It has good ductility after use and excellent weldability.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
Nikrothal 70 Resistohm 70	Cr30Ni70	–	–	N06008	NiCr70 30	2.4658	–	–	–	–

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Cr	Ni	Al	Fe
Nichrome 70	≤0.08	0.75-1.60	≤0.60	≤0.020	≤0.015	28.0-31.0	Bal	≤0.50	≤1.00

Mechanical Properties (RT, Annealed)

Tensile Strength, Rm/MPa	Elongation, A/%
Tensile Strength, Rm/MPa	Dia. >3.00mm (Wire) Thk. >0.20mm (Strip)	Dia. 0.10-3.00mm (Wire) Thk. <0.20mm (Strip)
≥650	≥25	≥20

Physical Properties

Max Working Temp., ℃	Melting Point, ℃	Density, g/cm3	Resistivity, μΩ·m 20℃	Specific Heat, J/(g•K)	Thermal Conductivity, W/(m•K) 20℃	Average Coefficient of Thermal Expansion,α×10-6/℃ 20-1000℃	Micrographic Structure	Magnetic Properties
1250	1380	8.10	1.18	0.46	14	17.0	Austenitie	Non-Magnetic

Life Test

Test Temperature, ℃	Continuous Service Time Hours, ℃
1250	≥50

Temperature Factor of Resistivity

20℃	100℃	200℃	300℃	400℃	500℃	600℃	700℃	800℃	900℃	1000℃	1100℃	1200℃	1300℃
1.000	1.007	1.016	1.028	1.038	1.044	1.036	1.030	1.028	1.029	1.033	1.037	1.043	–

Available Products and Specifications

Rod, Bar, Wire and Forgings	GB/T 1234-2012, DIN 17470-1984
Plate, Sheet and Strip	GB/T 1234-2012, DIN 17470-1984
Pipe and Tube	–
Welding Product	–
Others	–

Features

Great ductility
Excellent workability and weldability under high temperature
High and stable resistivity
Surface oxidation resistance
Sufficient high temperature strength
Working temperature up 1250℃

Applications

Corrosion resistant electric heating elements in industrial furnaces with reducing atmospheres
Highly resistant to oxidation in air
Not recommend for use in MgO sheathed heating elements, or applications using nitrogen or carburizing atmospheres