Product Description
Cr30Ni70 electric heating resistance alloy strip
(Common Name:Ni70Cr30, Nikrothal 70, N7, HAI-NiCr 70, Chromel 70/30, Resistohm 70, Balco,Tophet 30,Cronix 70,Alloy 710,Stablohm 710)
Ni70Cr30 is a nickel-chromium alloy (NiCr alloy) characterized byHigh resistivity, good oxidation resistance,very good form stability,good ductility and excellent weldability. It is suitable for use at temperatures up to 1250°C.
Typical applications for Ni70Cr30 are used in electrical heating elements in industrial furnace,and well suited for reducing atmospheres.
Normal composition%
C P S Mn Si Cr Ni Al Fe Other
Max
0.05 0.02 0.015 0.60 0.75~1.60 28.0~31.0 Bal. Max 0.50 Max 1.0 -
Typical Mechanical properties(1.0mm)
Yield strength Tensile Strength Elongation
Mpa Mpa %
430 820 30
Typical Physical properties
Density (g/cm3) 8.2
Electrical resistivity at 20ºC(ohm mm2/m) 1.18
Conductivity coefficient at 20ºC (WmK) 14
Coefficient of thermal expansion
Temperature Coefficient of Thermal Expansion x10-6/ºC
20 ºC- 1000ºC 17
Specific heat capacity
Temperature 20ºC
J/gK 0.46
Melting point (ºC) 1380
Max continuous operating temperature in air (ºC) 1250
Magnetic properties non-magnetic
Temperature Factors Of Electrical Resistivity
20ºC 100ºC 200ºC 300ºC 400ºC 500ºC 600ºC
1 1.007 1.016 1.028 1.038 1.044 1.036
700ºC 800ºC 900ºC 1000ºC 1100ºC 1200ºC 1300ºC
1.03 1.028 1.029 1.033 1.037 1.043 -
Style of supply
Alloys Name Type Dimension
Ni70Cr30W Wire D=0.03mm~8mm
Ni70Cr30R Ribbon W=0.4~40 T=0.03~2.9mm
Ni70Cr30S Strip W=8~250mm T=0.1~3.0
Ni70Cr30F Foil W=6~120mm T=0.003~0.1
Ni70Cr30B Bar Dia=8~100mm L=50~1000
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