The advantages of iron-chromium-aluminum electric heating alloys are high temperature, the highest temperature can reach 1400 degrees, long service life, high surface load, good oxidation resistance, high resistivity, low price, etc. The disadvantage is that the high temperature strength is low, with the use of When the temperature rises, its plasticity increases, and the components are easily deformed, not easy to bend and repair. maximum operating temperature of 1350°C with a very long service life; recommended maximum operating temperature of the heating element in the air, depending on the diameter (thickness): 0.2mm - 950°C; 0.4mm-1075°C; 1.0mm-1200°C; 3.0mm-1300°C; 6.0 mm and more - 1350°С.Iron-chromium-aluminum alloys are widely used in industrial electric heating furnaces,household appliances, far-infrared equipment, etc.
FeCrAl alloy 0Cr27Al5Ti is a popular precision alloy based on iron, aluminum and chromium. The basic chemical composition is encrypted in the brand name: chromium contains 26-28%, aluminum - 5-5.8%, iron - up to 68%. The alloy is reinforced with alloying additives: titanium (0.4%), silicon (0.6%), manganese (0.3%), nickel (0.6%) and other elements. Due to the high-precision composition, FeCrAl alloy has heat-resistant properties and is resistant to oxidizing environments.
Chemical composition according to GOST 10994-74
| Fe Iron | C Carbon | Si Silicon | Mn Manganese | Ni Nickel | S Sulfur | P Phosphorus | Cr Chromium | Ce Cerium | Ti Titanium | Al Aluminum | Ba Barium | Ca Calcium | - |
| Bal. | ≤ 0.05 | ≤ 0.6 | ≤ 0.3 | ≤ 0.6 | ≤ 0.015 | ≤ 0.02 | 26-28 | ≤ 0.1 | 0.15-0.4 | 5-5.8 | ≤ 0.5 | ≤ 0.1 | Ca, Ce - calculation |
| Values of the correction factor R0 / R20 at heating temperature, ℃ | |||||||||||||||
| 20 | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 | 1000 | 1100 | 1200 | 1300 | 1400 | |
| 0Cr27Al5Ti | 1,000 | 1,002 | 1,005 | 1,010 | 1,015 | 1,025 | 1,030 | 1,033 | 1,035 | 1,040 | 1,040 | 1,041 | 1,043 | 1,045 | - |
| Mechanical and electrical properties of the alloy | ||||||
| Alloy grade | Resistivity ρ,μOhm * m | Tensile strength, N / mm2 (kgf / mm2), no more | Elongation,%, not less | Test temperature, ℃ | Continuous service life, h, not less | Density |
| 0Cr27Al5Ti | 1.37- 1.47 | 780 ( 80) | 10 | 1300 | 80 | 7.19g/cm³ |
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