| Main characteristics of Fe-Cr-Al high resistance heating alloys |
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| (Alloy Nomenclature) |
1Cr13Al4 |
0Cr25Al5 |
0Cr21Al6 |
0Cr23Al5 |
0Cr21Al4 |
0Cr21Al6Nb |
0Cr27Al7Mo2 |
| (Performance) |
| (Main |
Cr |
12.0-15.0 |
23.0-26.0 |
19.0-22.0 |
20.5-23.5 |
18.0-21.0 |
21.0-23.0 |
26.5-27.8 |
| Chemical |
Al |
4.0-6.0 |
4.5-6.5 |
5.0-7.0 |
4.2-5.3 |
3.0-4.2 |
5.0-7.0 |
6.0-7.0 |
| composition) |
Re |
opportune |
opportune |
opportune |
opportune |
opportune |
opportune |
opportune |
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Fe |
|
Rest |
Rest |
Rest |
Rest |
Rest |
Rest |
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Rest |
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Nb0.5 |
Mo1.8-2.2 |
| ℃ (Max. continuous service temp.) |
950 |
1250 |
1250 |
1250 |
1100 |
1350 |
1400 |
| 20℃ (μΩ·m) (Resistivity at 20ºC) |
1.25 |
1.42 |
1.42 |
1.35 |
1.23 |
1.45 |
1.53 |
| (g/cm3) (Density) |
7.4 |
7.1 |
7.16 |
7.25 |
7.35 |
7.1 |
7.1 |
| (KJ/m·h·ºC) (Thermal conductivity) |
52.7 |
46.1 |
63.2 |
60.2 |
46.9 |
46.1 |
45.2 |
| (α×10-6/ºC) (Coefficient of lines expansion) |
15.4 |
16 |
14.7 |
15 |
13.5 |
16 |
16 |
| ( ºC) (Melting point |
1450 |
1500 |
1500 |
1500 |
1500 |
1510 |
1520 |
| (approx.)) |
| (N/mm2) (Tensile strength ) |
580-680 |
630-780 |
630-780 |
630-780 |
600-700 |
650-800 |
680-830 |
| (%) (Elongation at rupture) |
>16 |
>12 |
>12 |
>12 |
>12 |
>12 |
>10 |
| (%) (Variation of area) |
65-75 |
60-75 |
65-75 |
65-75 |
65-75 |
65-75 |
65-75 |
| (F/R) (Repeat Bending frequency) |
>5 |
>5 |
>5 |
>5 |
>5 |
>5 |
>5 |
| (H.B.) (Hardness) |
200-260 |
200-260 |
200-260 |
200-260 |
200-260 |
200-260 |
200-260 |
| (Hours/ ºC)(continuous service time) |
-- |
≥80/1300 |
≥80/1300 |
≥80/1300 |
≥80/1250 |
≥50/1350 |
≥50/1350 |
| (Micrographic structure) |
Ferrite |
Ferrite |
Ferrite |
Ferrite |
Ferrite |
Ferrite |
Ferrite |
| (Magnetic properties) |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
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