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Iron-Chromium-Aluminium Alloy for Electrical Resistance Heating

The iron-chromium-aluminum alloy for electrical resistance heating has higher service temperature than that of nickel chromium alloy. The highest service temperature is up to 1440℃. The more the content of chromium and aluminum has, the higher the heat resistance of the electrical resistance heating alloy is.

Due to its superior resistance to oxidation, sulfur and carburization, the Fe-Cr-Al alloy boasts longer service life and higher cost performance. Those terrific properties of the electrical heating material result in its wide application for heating elements in electric heaters.

More attention should be paid on the shortcoming of the iron-chromium-aluminum alloy that it has low strength at high temperature and its ductility will be enlarged as the service temperature grows. Therefore, you should take elements deformation into great account when selecting the heating element alloy. More information and details can be obtained by a contact with us.

Technical Parameters of Iron-Chromium-Aluminium Alloy
Model 1Cr13
A14
0Cr25
A15
0Cr21
A16
0Cr23
A15
0Cr21
A14
0Cr21
A16Nb
0Cr27
A17Mo2
Properties
Chemical composition 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
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 Balance Balance Balance Balance Balance Balance Balance
Fe ­—
Nb0.5 Mo1.8-2.2
Maximum service temperature (℃) 950 1250 1250 1250 1100 1350 1400
Specific resistance (μΩ.m,20℃) 1.25 1.42 1.42 1.35 1.23 1.45 1.53
Density (g/cm3) 7.4 7.10 7.16 7.25 7.35 7.10 7.10
Heat conductivity coefficient (KJ/m.h.℃) 52.7 46.1 63.2 60.2 46.9 46.1 45.2
Linear expansion coefficient (α×10-6/℃) 15.4 16.0 14.7 15.0 13.5 16.0 16.0
Melting point approx (℃) 1450 1500 1500 1500 1500 1510 1520
Tensile strength (Mpa) 580-680 630-780 630-780 630-780 600-700 650-800 680-830
Elongation (%) >16 >12 >12 >12 >12 >12 >10
Percentage reduction of area (%) 65-75 60-75 65-75 65-75 65-75 65-75 65-75
Alternating bending number >5 >5 >5 >5 >5 >5 >5
Hardness (H.B.) 200-260 200-260 200-260 200-260 200-260 200-260 200-260
Microscopic structure Ferrite Ferrite Ferrite Ferrite Ferrite Ferrite Ferrite
Magnetism Yes Yes Yes Yes Yes Yes Yes
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