OhmAlloy104A, also known as Ni35Cr20, Chromel D, Nikrothal 40, N4,
HAI-NiCr 40, Tophet D, Resistohm 40, Cronifer Ⅲ, Chromex, 35-20
Ni-Cr, Alloy D, NiCr-D Alloy 600, MWS-610, and Stablohm 610, is a
type of nickel-chromium alloy that boasts high resistivity, good
oxidation resistance, excellent form stability, good ductility, and
exceptional weldability. It can withstand temperatures of up to
1100°C, making it a reliable choice for various applications.
One of the most common uses of OhmAlloy104A is in night-storage
heaters, convection heaters, heavy-duty rheostats, and fan heaters.
It is also used in heating cables and rope heaters for defrosting
and de-icing elements, electric blankets and pads, car seats,
baseboard heaters, and floor heaters. Additionally, it is used in
resistors.
Thanks to its excellent form stability and ductility, OhmAlloy104A
is easy to shape and form into various shapes and sizes. Its
weldability is also noteworthy, making it easy to join with other
materials.
Overall, OhmAlloy104A is a versatile and reliable material that can
be used in a wide range of applications where high resistivity and
good oxidation resistance are required. Its excellent form
stability, ductility, and weldability make it an ideal choice for
various heating applications.
Size dimension range:
Wire: 0.01-10mm
Ribbons: 0.05*0.2-2.0*6.0mm
Strip: 0.05*5.0-5.0*250mm
NiCr series: Cr20Ni80, Cr30Ni70, Cr15Ni60, Cr20Ni35, Cr20Ni30
| Performance material | Cr10Ni90 | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 |
| Composition | Ni | 90 | Rest | Rest | 55.0~61.0 | 34.0~37.0 | 30.0~34.0 |
| Cr | 10 | 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 |
| Maximum temperature℃ | 1300 | 1200 | 1250 | 1150 | 1100 | 1100 |
| Meltiing point ℃ | 1400 | 1400 | 1380 | 1390 | 1390 | 1390 |
| Density g/cm3 | 8.7 | 8.4 | 8.1 | 8.2 | 7.9 | 7.9 |
| Resistivity at 20℃((μΩ·m) | | 1.09±0.05 | 1.18±0.05 | 1.12±0.05 | 1.00±0.05 | 1.04±0.05 |
| Elongation at rupture | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 |
| Specific heat | | 0.44 | 0.461 | 0.494 | 0.5 | 0.5 |
| J/g.℃ |
| Thermal conductivity | | 60.3 | 45.2 | 45.2 | 43.8 | 43.8 |
| KJ/m.h℃ |
| Coefficient of lines expansion | | 18 | 17 | 17 | 19 | 19 |
| a×10-6/ |
| (20~1000℃) |
| Micrographic structure | | Austenite | Austenite | Austenite | Austenite | Austenite |
| Magnetic properties | | Non-magnetic | Non-magnetic | Non-magnetic | Weak magnetic | Weak magnetic |
| Micrographic structure | Ferrite | Ferrite | Ferrite | Ferrite | Ferrite | Ferrite |
| Magnetic properties | Magnetic | Magnetic | Magnetic | Magnetic | Magnetic | Magnetic |
| Form | Specification |
| Wire | Diameter=0.025mm~8mm |
| Flat wire | Width=0.40~6.0mm | Thick=0.03~0.50mm |
| Strip | width=8~250mm | Thick=0.05~3.0mm |
| Bar | Diameter=8~100mm | Long=50~1000 |
NiCr 80/20 is suitable for heating elements used for temperatures
upto 1200°C. This is used for electrical cooking equipment,
precison resistors. Oxidized wires of these alloys display better
insulation properties.
NiCr 70/30 is suitable for heating elements used for temperatures
upto 1230°C for industrial furnaces which have alternating
oxidizing, or reducing atmosphere. This alloy has excellent
corrosion resistance and long life in air and controlled
atmospheres.
NiCr 60/15 is suitable for heating elements used for temperatures
upto 1150°C. This is used for electrically heated equipment, high
resistance and potientiometer resistors.
NiCr 30/20 is suitable for heating elements used for temperatures
upto 1050°C. Inspite of relatively high Fe content, these alloys
are resistant to oxidation and chemical corrosion. They are used
for making heating elements of cooking equipment, heating cords and
cables.
