Nichrome electric heating resistance wire(Ni80Cr20,Ni60Cr15,Ni35Cr20)
NiCr Heating resistance alloys are mainly in the form of wire and strip for use at 1100ºC~1250ºC(2010°F~2280°F).It is supplied with bright,oxidized and acid-white surface,spooled and coiled package.They are mainly used in industrial furnace and various heaters,resistors.
NiCr alloys Advantages
Have higher hot and creep strength than FeCrAl alloys.
Better ductility after long use than FeCrAl alloys.
Generally have better corrosion resistance at room temperature than FeCrAl alloys.
Longer life span than FeCrAl.
Main grades of NiCr alloys
Nichrome 80(Cr20Ni80)
Common Name:Ni80Cr20,Nikrothal 8,MWS-650,NiCrA,Tophet A,HAI-NiCr 80,Chromel A,Alloy A,Alloy 650,N8,Resistohm 80, Stablohm 650,Nichorme V,Nikrothal 80.
Characteristics
High resistivity, good oxidation resistance and very good form stability. It is suitable for use at temperatures up to 1200ºC,and holds a superior service life compared to Iron chromium alumium alloys.
Typical applications
Cooking:hot plates,domestic ovens,grills,toaster ovens,frying pans,deep fryers,rice cookers.
Water and beverage:boilers,immersion heaters,water kettles,coffee makers,dish washers,washing machines.
Space heating:radiators,storage heaters.
Others:irons,air heaters,oil heaters,glow plugs,sauna heaters
Nichrome 70(Cr30Ni70)
Common Name:Ni70Cr30, Nikrothal 70, N7, HAI-NiCr 70, Chromel 70/30, Resistohm 70, Balco,Tophet 30,Cronix 70,Alloy 710,Stablohm 710
Characteristics
High resistivity, good oxidation resistance,very good form stability,good ductility and excellent weldability. It is suitable for use at temperatures up to 1250ºC.
Typical applications
Electrical heating elements in industrial furnaces. The alloy is particularly well suited for reducing atmospheres, as it is not subject to 'green rot'.
Nichrome 60(Cr15Ni60)
Common Name:Ni60Cr15,Chromel C, Nikrothal 60, N6, HAI-NiCr 60, Tophet C, Resistohm 60, Cronifer II,Electroloy, Nichrome, Alloy C, Alloy 675,Nikrothal 6, MWS-675, Stablohm 675,NiCrC
Characteristics
High resistivity, good oxidation resistance ,good form stability and good ductility and excellent weldability. It is suitable for use at temperatures up to 1150°C.
Typical applications
Metal sheathed tubular elements,such as hot plates, grills, toaster ovens and storage heaters
Suspended coils in air heaters,clothes dryers, fan heaters, hand dryers.
Nichrome 40(Cr20Ni35)
Common Name:Ni35Cr20,Chromel D, Nikrothal 40, N4, HAI-NiCr 40, Tophet D, Resistohm 40, Cronifer ,Chromex,35-20 Ni-Cr,Alloy D,NiCr-D,Alloy 600,Nikrothal 4,MWS-610,Stablohm 610.
Characteristics
High resistivity, good oxidation resistance,very good form stability,good ductility and excellent weldability. It is suitable for use at temperatures up to 1100°C.
Typical applications
Night-storage heaters, convection heaters, heavy duty rheostats and fan heaters. The alloy is also used for heating cables and rope heaters in defrosting and de-icing elements, electric blankets and pads, car seats, baseboard heaters and floor heaters, resistors.
Nichrome 30(Cr20Ni30)
Common Name:Ni30Cr20,Nikrothal 30, N3, HAI-NiCr 30, Resistohm 30,30-20 Ni-Cr,Nikrothal 3.
Characteristics
High resistivity, good oxidation resistance,very good form stability,good ductility and excellent weldability. It is suitable for use at temperatures up to 1100°C.
Typical applications
Solid hot plates, open coil heaters in HVAC systems, night-storage heaters, convection heaters, heavy duty rheostats and fan heaters.The alloy is also used for heating cables and rope heaters in defrosting and de-icing elements, electric blankets and pads, car seats, baseboard heaters, floor heaters and resistors.
Physical and mechanical properties
| Propertes/Grade | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 |
| Main Chemical Composition(%) | Ni | Rest | Rest | 55.0-61.0 | 34.0-37.0 | 30.0-34.0 |
| Cr | 20.0-23.0 | 28.0-31.0 | 15.0-18.0 | 18.0-21.0 | 18.0-21.0 |
| Fe | ≤ 1.0 | ≤ 1.0 | Rest | Rest | Rest |
Max Continuous Service
Temperature(ºC) | 1200 | 1250 | 1150 | 1100 | 1100 |
| Resistivity at 20ºC(μ Ω · m) | 1.09 | 1.18 | 1.12 | 1.04 | 1.04 |
| Density(g/cm3) | 8.4 | 8.1 | 8.2 | 7.9 | 7.9 |
| Thermal Conductivity(KJ/m· h· ºC) | 60.3 | 45.2 | 45.2 | 43.8 | 43.8 |
Coefficient of Thermal
Expansion(α × 10-6/ºC) | 18 | 17 | 17 | 19 | 19 |
| Specific Heat Capacity(J/g.K) | 0.46 | 0.46 | 0.46 | 0.50 | 0.50 |
| Thermal Conductivity at 20ºC(W/m.K) | 15 | 14 | 13 | 13 | 13 |
| Melting Point(ºC) | 1400 | 1380 | 1390 | 1390 | 1390 |
| Elongation(%) | > 20 | > 20 | > 20 | > 20 | > 20 |
| Micrographic Structure | austenite | austenite | austenite | austenite | austenite |
| Magnetic Property | Non magnetic | Non magnetic | Non magnetic | Non magnetic | Non magnetic |
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