Ni70Cr30 Nichrome Heating Alloy Resistohm Nikrothal 70 Alloy 710
For Industry Furnace Heating
Ohmalloy118
(Common Name: Ni70Cr30, Nikrothal 70, N7, HAI-NiCr 70, Chromel
70/30, Resistohm 70, Balco,Tophet 30,Cronix 70,Alloy 710,Stablohm
710)
OhmAlloy118 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 OhmAlloy118 are used in electrical heating
elements in industrial furnace,and well suited for reducing
atmospheres.
Resistohm Nikrothal 70 Alloy 710 Normal composition(%)
| C | P | S | Mn | Si | Cr | Ni | Al | Fe |
| Max |
| 0.08 | 0.02 | 0.015 | 0.60 | 0.75~1.60 | 28.0~31.0 | Balance | Max 0.50 | Max 1.0 |
Resistohm Nikrothal 70 Alloy 710 Typical Mechanical properties(1.0mm)
| Yield strength | Tensile Strength | Elongation |
| Mpa | Mpa | % |
| 430 | 820 | 30 |
Resistohm Nikrothal 70 Alloy 710 Typical Physical properties
| Density (g/cm3) | 8.2 |
| Electrical resistivity at 20℃(Ωmm2/m) | 1.18 |
| Conductivity coefficient at 20℃ (WmK) | 14 |
| Melting point (℃) | 1380 |
| Max continuous operating temperature in air (℃) | 1250 |
| Magnetic properties | non-magnetic |
| Coefficient of thermal expansion |
| Temperature | Coefficient of Thermal Expansion x10-6/℃ |
| 20 ℃- 1000℃ | 17 |
| Specific heat capacity |
| Temperature | 20℃ |
| J/gK | 0.46 |
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
| Alloys Name | Type | Dimension | |
| OhmAlloy118W | Wire | D=0.03mm~8mm | |
| OhmAlloy118R | Ribbon | W=0.4~40 | T=0.03~2.9mm |
| OhmAlloy118S | Strip | W=8~250mm | T=0.1~3.0 |
| OhmAlloy118F | Foil | W=6~120mm | T=0.003~0.1 |
| OhmAlloy118B | Bar | Dia=8~100mm | L=50~1000 |
This alloy(NiCrC Resistohm Nikrothal 70 ) with a chemical
composition of 70 % of nickel and 30 % chromium, make practically
the unanimity among the users of material of metallic resistances.
It contains rare earth additions for increased resistance,
especially under conditions of frequent switching or wide
temperature fluctuations. This is an excellent choice for heating
elements operating at a temperature up to 1200°C, which include the
majority of industry and other heating elements operating in an
average range of temperatures.
