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.
