0cr21al6 Spring Resistance Heating Strip

A.FeCrAl electrical resistance heating alloy features
  1) wires has high resistance, low temperature coefficient of electric resistance, high operating temperature, and good corrosion resistance under high temperature, especially under the atmosphere containing sulfides. FeCrAl wire possesses good oxidation and heat resistance.FeCrAl wires are creep-resistant over a wide range of temperature, which is another of their important qualities.
  2) wires have several potential advantages, such as lower raw-material cost, superior oxidation resistance, lower density, and lower thermal expansion coefficient than the Ni-base super-s.However, FeCrAl wire has less hot strength than nickel s but much higher melting point and lower price. After being heated the 's plasticity becomes bad, easy brittleness, not to be easy to weld. However, If can be reasonably used, also be a kind of ideal electric heating material.
  3) wires are made of iron chromium aluminum base s containing small amounts of reactive elements such as yttrium and zirconium. The high aluminum content, in combination with the high chromium content causes the scaling temperature to increase up to 1425ºC (2600ºF ); Fe Cr Al s also have excellent oxidation properties at 800-1300ºC because of the formation of a highly protective Al2O3 scale.  
B.Main Property of FeCrAl electrical resistance heating alloy

Type
1Cr13Al4
0Cr25Al5
0Cr23Al5
0Cr21Al4
0Cr21Al6Nb
0Cr27Al7Mo2
Main
Cr
12.0-15.0
23.0-26.0
19.0-22.0
22.5-24.5
18.0-21.0
21.0-23.0
26.5-27.8
Chemical composition
Al
4.0-6.0
4.5-6.5
5.0-7.0
4.2-5.0
3.0-4.2
5.0-7.0
6.0-7.0
Re
opportune
opportune
opportune
opportune
opportune
opportune
opportune
Fe
Rest
Rest
Rest
Rest
Rest
Rest
Rest
Maximal Temperature (°C)
650
1250
1250
1250
1100
1350
1400
Resistivity 20°C (10-6ohm*m)
1.25
1.42
1.42
1.35
1.23
1.45
1.53
Density(g/cm3)
7.4
7.1
7.16
7.25
7.35
7.1
7.1
Thermal conductivity (KJ/m*h*°C)
52.7
46.1
63.2
60.2
46.9
46.1
45.2
Extend strength (a*10-6/°C)
15.4
16
14.7
15
13.5
16
16
Melting point ( °C)
1450
1500
1500
1500
1500
1510
1520
Tensile strength(N/mm2)
588-735
630-780
637-780
630-780
637-784
650-800
680-830
Extension rate%
>16
>12
>12
>12
>12
>12
>10
Section shrink rate (%)
65-75
60-75
65-75
65-75
65-75
65-75
65-75
Repeatedly bending frequency (F/R)
>5
>5
>5
>5
>5
>5
>5
Specific heat J/g.
0.49
0.494
0.52
0.46
0.49
0.494
0.494
Linear expansion coefficient a×10-6/201000
15.4
16
14.7
15
13.5
16
16
hardness (H.B.)
200-260
200-260
200-260
200-260
200-260
200-260
200-260
Rapid life h/
≥80/1250
≥80/1300
≥80/1300
≥80/1300
≥80/1350
≥80/1350
Microstructure
Ferrite
Ferrite
Ferrite
Ferrite
Ferrite
Ferrite
Ferrite
Magnetism
Magnetic
Magnetic
Magnetic
Magnetic
Magnetic
Magnetic
Magnetic

C. FeCrAl electrical resistance heating alloy Applications
  1) wires intended for prolonged operation at high temperature. FeCrAl wires are used chiefly for heating elements in the electrical industry and wide range of high-temperature oxidation environments, such as industrial electric furnace, heating furnace, petroleum refinery and automotive exhaust system, household electrical appliance, electrical oven, electrical heater, infrared settings and far infrared ray device.
  2) wires' ability to withstand oxidation, the wires can be employed under high-temperature conditions, while their good ductility enables them to be processed into wire and strip by hot and cold working.
  3) Wire manufactured (Hot rolling, cold drawning, annealing, etc)