Electrical Resistance Heating Wire Fe-Cr-Al TANKII D/Resistohm
135/FeCrAl 135/Alloy 815/Alferon 901/Alchrome DK/Stablohm 812
0Cr23Al5
General Information
Resistance wire is a type of high resistance electrical wire. The
wire resists the flow of electricity, and converts the electrical
energy into heat.
Application for resistance wire includes resistors, heating
elements, electric heaters, electric ovens, toasters, and many
more.
Nichrome, a non-magnetic alloy of nickel and chromium, is commonly used to
make resistance wire because it has a high resistivity and
resistance to oxidation at high temperatures. When used as a
heating element, resistance wire is usually wound into coils. One
difficulty in using nichrome wire is that common electrical solder
will not stick to it, so the connections to the electrical power
must be made using other methods such as crimp connectors or screw
terminals.
FeCrAl, a family of iron-chromium-aluminum alloys (TANKII APM, A-1, D and
AF etc.) used in a wide range of resistance and high-temperature
applications is also used in the form of resistance wires.
Resistohm 135
OCr23AL5 also known as Alchrome D,alloy 815,Resistohm 135, Stablohm 812, Alohrome DK, Alferon 901, Alloy k, Aluchrom Y,
Gilphy 135
1.Chemical composition
| Ni | Cr | Fe | Cu | Others |
% | - | 20 | Bal. | - | Al: 4.5, ++ |
. Physical properties
- Resistivity (Ωmm²/m) : 1.35
- Temperature coefficient (K x 10- 6/°C) : 70
from 20 to 1000 °C
- Thermal conductivity at 120 °C (Wm- 1° C-1) : 16.50
- Coefficient of linear expansion (coeff. 10-6/°C) : 14
from 20 to 1000 °C
- Density (g/cm3) : 7.25
- Creeping point in
- at 800 °C : 6
- at 1 000°C : 1
- Melting point (°C) : 1 500
- Maximal operating temperature (°C) : 1 200
Standard mechanical properties
- Tensile Strength (daN/mm²) : 75
- Yield Strength (daN/mm²) : 55
- Elongation (A% on 100 mm) : ≥18
- Hardness (HV) : 230
3. Size
Wire: 0.018mm-10mm
Ribbon: 0.05*0.2mm-2.0*6.0mm
Strip: 0.5*5.0mm-5.0*250mm
Bar: 10-100mm
4. Typical Applications
Resistohm 135 is a ferritic alloy of the FeCrAl family, which can be used as
heating element of resistance up to 1200°C.
Resistohm 135 must be used in a dry environment in order to avoid rust because
this is not a stainless alloy.
Elements realised in Resistohm 135 have an excellent life time in a
sulphurous environment, and particularly when atmosphere is also
oxidizing.
Resistohm 135 is normally used in top cookers with ceramics, pottery furnaces
elements, and tubular elements.
Because of its resistance to carbonaceous atmospheres, Resistohm
135 is chosen for the production of cigarette lighters and fuel
burners elements.
Q1. What kind of materials (symbols) are used for electical heating
wires?
A. Ni-Cr series alloys and Fe-Cr-Al series alloys are mainly used.
Q2. What is the advantage or disadvantage depending on the
materials?
A. We will briefly show you them in Table 1
Table 1
Series | Advantages | Diadvantages |
Ni-Cr series alloys | •Good resistant to oxidation at high temperature in air. •Durable strength at high Temperature. •Good weldability. | •Low resistivity (compared to Fe-Cr-Al series). •Poor resistant to sulphuric gases or substances. •Possibility of green rot decay. |
Fe-Cr-Al series alloys | •High resistivity •Good resistant to oxidation at high temperature in air. | •Low strength at high temperature
(compared to Ni-Cr series) •Poor resistant to corrosion at room temperature in air. |
