Iron-Chromium-Aluminum Alloy Wires
0Cr20Al3/0Cr21Al4 heating resistance wires
- Features:
- 0Cr20Al3/0Cr21Al4 is one of the Fe-Cr-Al alloys with the best cold working properties. Compared to high-aluminum grades (such as 0Cr25Al5 or 0Cr21Al6Nb), its room temperature brittleness is significantly reduced, and elongation is higher (typically >20%). This makes it ideal for manufacturing heating elements requiring complex cold forming, deep drawing, or drawing into extremely fine wires without frequent intermediate annealing. Although its maximum operating temperature is slightly lower than high-aluminum grades, it offers the most economical solution for most industrial and domestic heating applications below 1100℃, while maintaining the inherent high resistivity and oxidation resistance of Fe-Cr-Al alloys. Despite the slightly lower aluminum content, 0Cr20Al3/0Cr21Al4 still forms a dense Al₂O₃ protective film at high temperatures. In air environments at 1000-1100℃, its oxidation resistance life is typically superior to Cr20Ni80 nickel-chromium alloys at the same temperature, and it does not suffer from embrittlement due to grain coarsening after long-term high-temperature use like Ni-Cr alloys.
- 0Cr20Al3 Resistance Wire is also known as 0Cr21Al4, Resistohm 123, CrAl 193, GFC123 / GFC123W, 0Cr19Al3, FCHW-2 / FCHR-2, CrAl 20 5 etc.
- Specifications:
- Bright and soft annealed finish: 0.05 - 1.6mm; Acid-pickled or oxidation finish: 1.0 -12.0mm; Rods: 6.0-150.0mm
Flat wire: width from 0.2 - 6.0mm and thickness from 0.08 - 1.0mm; Wide strip: width from 5.0 - 300mm and thickness from 0.05 - 4.0mm
Product Description
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Chemical Composition:| C | P | S | Mn | Si | Cr | Ni | Al | Fe |
|---|---|---|---|---|---|---|---|---|
| ≤ | ||||||||
| 0.08 | 0.025 | 0.02 | 0.5 | ≤0.7 | 18.0~21.0 | ≤0.6 | 3.0~4.2 | Remainder |
| Max. continuous service Temp. | 1100ºC | Resistivity at 20ºC( μΩ·m) | 1.23±0.07 |
| Density | 7.35 g/cm3 | Thermal conductivity(20ºC) | 13 W/(m·K) |
| Average linear expansion coefficient(20-1000ºC) | 13.5×10-6/ºC | Specific heat capacity | 0.49 J/(g·K) |
| Approx. melting point | 1500ºC | Elongation at breakn | Diameter≤3.0mm: ≥12% Diameter>3.0mm: ≥15% |
| Tensile strength(Rm/MPa) | ≥580 | Accelerated life test | ≥80h/1250ºC |
| Micrographic structure | Ferrite | Magnetic properties | Magnetic |
|
Diameter
(mm) |
Ohm per meter
(20ºC Ω/m) |
Length per kg
(m/kg) |
Weight per meter
(g/m) |
Diameter
(mm) |
Ohm per meter
(20ºC Ω/m) |
Length per kg
(m/kg) |
Weight per meter
(g/m) |
|---|---|---|---|---|---|---|---|
| 0.05 | 626.434 | 69292.01 | 0.01443 | 1.1 | 1.2943 | 143.17 | 6.98493 |
| 0.06 | 435.024 | 48119.45 | 0.02078 | 1.2 | 1.0876 | 120.30 | 8.31265 |
| 0.07 | 319.609 | 35353.06 | 0.02829 | 1.3 | 0.9267 | 102.50 | 9.75582 |
| 0.08 | 244.701 | 27067.19 | 0.03695 | 1.4 | 0.7990 | 88.38 | 11.31444 |
| 0.09 | 193.344 | 21386.42 | 0.04676 | 1.5 | 0.6960 | 76.99 | 12.98851 |
| 0.1 | 156.609 | 17323.00 | 0.05773 | 1.6 | 0.6118 | 67.67 | 14.77804 |
| 0.11 | 129.429 | 14316.53 | 0.06985 | 1.7 | 0.5419 | 59.94 | 16.68302 |
| 0.12 | 108.756 | 12029.86 | 0.08313 | 1.8 | 0.4834 | 53.47 | 18.70346 |
| 0.13 | 92.668 | 10250.30 | 0.09756 | 1.9 | 0.4338 | 47.99 | 20.83934 |
| 0.15 | 69.604 | 7699.11 | 0.12989 | 2.0 | 0.3915 | 43.31 | 23.09069 |
| 0.17 | 54.190 | 5994.12 | 0.16683 | 2.2 | 0.3236 | 35.79 | 27.93973 |
| 0.19 | 43.382 | 4798.62 | 0.20839 | 2.4 | 0.2719 | 30.07 | 33.25059 |
| 0.21 | 35.512 | 3928.12 | 0.25457 | 2.6 | 0.2317 | 25.63 | 39.02326 |
| 0.25 | 25.057 | 2771.68 | 0.36079 | 2.8 | 0.1998 | 22.10 | 45.25775 |
| 0.27 | 21.483 | 2376.27 | 0.42083 | 3.0 | 0.1740 | 19.25 | 51.95404 |
| 0.29 | 18.622 | 2059.81 | 0.48548 | 3.2 | 0.1529 | 16.92 | 59.11216 |
| 0.31 | 16.296 | 1802.60 | 0.55475 | 3.4 | 0.1355 | 14.99 | 66.73208 |
| 0.35 | 12.784 | 1414.12 | 0.70715 | 3.6 | 0.1208 | 13.37 | 74.81382 |
| 0.40 | 9.788 | 1082.69 | 0.92363 | 3.8 | 0.1085 | 12.00 | 83.35738 |
| 0.45 | 7.734 | 855.46 | 1.16897 | 4.0 | 0.0979 | 10.83 | 92.36275 |
| 0.50 | 6.264 | 692.92 | 1.44317 | 4.5 | 0.0773 | 8.55 | 116.89660 |
| 0.55 | 5.177 | 572.66 | 1.74623 | 5.0 | 0.0626 | 6.93 | 144.31679 |
| 0.60 | 4.350 | 481.19 | 2.07816 | 5.5 | 0.0518 | 5.73 | 174.62332 |
| 0.65 | 3.707 | 410.01 | 2.43895 | 6.0 | 0.0435 | 4.81 | 207.81618 |
| 0.70 | 3.196 | 353.53 | 2.82861 | 6.5 | 0.0371 | 4.10 | 243.89538 |
| 0.80 | 2.447 | 270.67 | 3.69451 | 7.0 | 0.0320 | 3.54 | 282.86091 |
| 0.85 | 2.168 | 239.76 | 4.17076 | 7.5 | 0.0278 | 3.08 | 324.71278 |
| 0.90 | 1.933 | 213.86 | 4.67586 | 8.0 | 0.0245 | 2.71 | 369.45098 |
| 0.95 | 1.735 | 191.94 | 5.20984 | 8.5 | 0.0217 | 2.40 | 417.07552 |
| 1.00 | 1.566 | 173.23 | 5.77267 | 9.0 | 0.0193 | 2.14 | 467.58640 |
The above parameters are based on Chinese National Standard GB/T1234-2012. The tolerance of resistance per meter: 0.03-0.06mm is ±10%; 0.07-0.12mm is ±8%; 0.13-0.17mm is ±7%; 0.18-0.32mm is ±6%; A wire diameter above 0.32mm is ±5%. We provide the Iron-Chromium-Aluminium alloy products in various forms, like the wires, strips and rods. Other alloys like 0Cr23Al5, 0Cr21Al6Nb, 0Cr25Al5, 0Cr20Al6RE, 1Cr13Al4 and 0Cr27Al7Mo2 are also available upon request.