New nichrome
characteristic
Nichrome has a successful combination of heat resistance and high electrical resistance. The minimum coefficient of thermal expansion ensures that the wire will not sag at significant temperatures. The surface oxides of chromium and nickel give the alloy excellent corrosion resistance which allows it to be used in aggressive environments. Plasticity allows the finest wire and strip to be rolled in a cold condition. Heat resistance helps nickel alloy fragments withstand mechanical loads without deformation or fracture. Almost the only drawback is that this alloy is quite expensive. To make it cheaper, ferrochromes were developed in which part of the expensive nickel was replaced with iron. At the same time, ferronichromes did not lose their high electrical resistance. Sufficient heat resistance allows their use in the temperature range 1200-1250°C. But with the loss of nickel, ferronichromes also lost their ductility and are more difficult to pull out the fine filaments needed to reliably operate the heating elements. That is why they are often used as the basis for heat-resistant components that are not subjected to severe stress at t° >1000 °C.
use
New chromium-nickel alloys X20H30 and X20H35, compared with the classic X20H80 - more economical and successfully used in modern industry. They are sufficiently resistant to aggressive industrial environments, are used for high-temperature rheostats, resistors, heating elements of industrial flame furnaces. They can be applied by gas-thermal spraying on the heat-resistant parts of turbojet engines.
| Alloy | Mn | C | Si | Cr | Ni | Fe |
|---|---|---|---|---|---|---|
| OCr20Ni30 Cr20Ni30 | up to 60 | up to 0.6 | 1,0 - 1,5 | 19.5-21.5 | 30.0-31.0 | ost |
| OCr20Ni35 X20H35 | up to 60 | up to 0.6 | 1,0 - 1,5 | 19.5-21.5 | 34.0-37.0 | |
| OCr30Ni70 X30H70 | up to 60 | up to 0.6 | 1,0 - 1,5 | 28.0-31.0 | Rest | ≤1.00 |
| Alloy | Tensile Strength N/mm2 | Elongation at break (%) | Density g/cm3 | Electrical resistivity (Ωmm2/m) | Maximum continuous temperature (°C) | Melting point (°C) | Thermal conductivity (KJ/m*h*°C) | Coefficient of linear expansion (αx10-6/°C) | Lifetime, h |
|---|---|---|---|---|---|---|---|---|---|
| C20H30 | 630-780 | '20 | 7.90 | 1.04 ±0.05 | 1100 | 1390 | 43.8 | 19.0 | '4 000 |
| CR20H35 | 630-780 | '20 | 7.90 | 1.00 ±0.05 | 1100 | 1390 | 43.8 | 19.0 | '4 000 |
| CRN70YU | 637-784 | '20 | 8.10 | 1.18 ±0.05 | 1250 | 1380 | 45.2 | 17.0 | '4 000 |
NiCr70/30, 30%/70% Chrome/Nickel. 710ohms/cmf, melting point 1380 °C. Analogues: N7, Chronix 70, NiKrothal 70, HAI-NiCr 70, GS 70, Chromel 70/30, Stablohm 710, Ni70Cr30.
NiCr35/20 610ohms/cmf, melting point 1390 °C. Chrome D, GS 40, Nikrothal 4, NiKrothal 40, Resistohm 40, HAI-NiCr 40, Cronifer III, 35-20Ni-Cr, Ni35Cr20, EuroNichrome.
Buy at best price
Evek GmbH has a wide range of heat-resistant materials in stock, which gives:
- Prompt delivery within Ukraine and abroad
- Additional savings for customers on storage space and supplies
- Wide range of alloys
We supply certified products of Fe-Cr and Nichrome. We appreciate the time of our customers, so we are always happy to assist with the choice. Experienced consulting managers are at your service. Product quality is guaranteed by strict compliance with production standards. Execution of orders takes minimal time. Wholesale customers are offered discounts.
