(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 20℃ (Ωmm2/m) | 1.18 |
Conductivity coefficient at 20℃ (WmK) | 14 |
Coefficient of thermal expansion
Temperature | Thermal Expansion x10-6/K |
20 ℃- 1000℃ | 17 |
Specific heat capacity
Temperature | 20℃ |
J/gK | 0.46 |
Melting point (℃) | 1380 |
Max continuous operating temperature in air (℃) | 1250 |
Magnetic properties | non-magnetic |
Temperature Factors Of Electrical Resistivity
20℃ | 100℃ | 200℃ | 300℃ | 400℃ | 500℃ | 600℃ |
1 | 1.007 | 1.016 | 1.028 | 1.038 | 1.044 | 1.036 |
700℃ | 800℃ | 900℃ | 1000℃ | 1100℃ | 1200℃ | 1300℃ |
1.03 | 1.028 | 1.029 | 1.033 | 1.037 | 1.043 | - |
Style of supply
Type | Dimension |
Wire | D=0.03mm~8mm |
Ribbon | W=0.4~40 | T=0.03~2.9mm |
Strip | W=8~250mm | T=0.1~3.0 |
Foil | W=6~120mm | T=0.003~0.1 |
Bar | Dia=8~100mm | L=50~1000 |
