FeCrAl 135 and FeCrAl 145 Alloys – Composition and Performance
FeCrAl 135 and FeCrAl 145 are two of the most widely used grades of iron-chromium-aluminum resistance alloys, offering distinct performance characteristics for different heating and resistance applications. Understanding the composition and properties of these grades is essential for selecting the right material for specific applications.
Understanding FeCrAl 135 and FeCrAl 145
FeCrAl 135, also known as Resistohm 135, and FeCrAl 145, also known as Resistohm 145, are commercially available FeCrAl alloys. The numerical designation typically refers to specific resistivity or composition standards established by manufacturers. These alloys are part of a broader family of FeCrAl grades including Resistohm 125, 140, and 153.
Chemical Composition
FeCrAl alloys contain iron, chromium, and aluminum as primary elements, with small additions of other elements to enhance performance. Typical compositions include:
| Element | Typical Range |
|---|---|
| Chromium (Cr) | 12.5–26.0% |
| Aluminum (Al) | 3.5–7.0% |
| Iron (Fe) | Balance |
| Rare Earth Additions | Trace (Y, Zr, Ce, La) |
Source: TANKII product data
Performance Characteristics
Resistohm 135: FeCrAl 135 is relatively weaker mechanically compared to other grades, making it suitable for applications where mechanical strength is not the primary requirement.
Resistohm 145: FeCrAl 145 is a high-performance iron-chromium alloy with a density of 7.2-7.7 g/cm³, offering a balance of properties suitable for demanding heating applications.
Key Applications
Both FeCrAl 135 and FeCrAl 145 are used in the production of heating elements and resistance elements across industries including industrial furnaces, household appliances, metallurgy, machinery, aircraft, automotive, and military.
Future Outlook
FeCrAl 135 and FeCrAl 145 alloys are expected to maintain their market positions, with ongoing research focused on optimizing compositions for specific applications and improving mechanical properties.
