Heating Elements
FHL® Spiral Heaters
Free-radiating spiral-wound elements for grooves, tubes and suspended mounting in industrial furnaces.
FHL® Spiral Heaters are precision-wound helical resistance heaters manufactured from Fe-Cr-Al and Ni-Cr wire for free-radiating furnace duty. Spirals are supplied to exact diameter, pitch and rating for installation in insulation grooves, on ceramic tubes, or as suspended heaters.
Key features
Precision-wound spirals to specified OD, pitch and rating
Fe-Cr-Al and Ni-Cr 80 alloys
For grooves, support tubes and suspended mounting
Designed against surface load for long element life
Any wire diameter — custom-built to requirement
Every spiral heating element is engineered to suit the required element temperature, surface loading and operating atmosphere, ensuring reliable performance and extended service life. Backed by our in-house alloy data and application engineering expertise, each design is tailored to meet the specific thermal and operational demands of your application.
Custom-Built Parameters
- Wire diameter
- Any diameter as per design requirement
- Alloys
- Fe-Cr-Al Alloy 1 & 2 · Ni-Cr 80
- Supply form
- Wound spirals to specified OD, pitch & length
Typical Applications
Technical data
Published grade data for FHL® heaters. Values are typical for the grade; confirm design values with our engineers for your duty cycle.
Physical & Mechanical Properties of FHL-MULTICORE® Heating Elements
Other elements present in small quantity. Values are typical for the grade; confirm design values with our engineers for your duty cycle.
| Fe-Cr-Al Heating Element | Ni-Cr 80 Heating Element | ||
|---|---|---|---|
| Property | Alloy 1 | Alloy 2 | Ni-Cr 80 |
| Standard Chemical Composition (%) | Al 5.0 · Cr 23 · Fe 72 | Al 6.0 · Cr 23 · Fe 71 | Cr 19–21 · Fe < 1 · Ni ≥ 77 |
| Max. Duty Temp. of Heating Element (°C) | 1320 | 1420 | 1150 |
| Electric Resistivity (Ω·mm²/m) | 1.35 ± 5% | 1.45 ± 5% | 1.08 ± 5% |
| Density (g/cm³) | 7.25 | 7.1 | 8.3 |
| Expansion from Thermal Factor (K⁻¹) | 15.1 × 10⁻⁶ | 14.8 × 10⁻⁶ | 17.6 × 10⁻⁶ |
| Thermal Conductivity at 20°C (W/m·K) | 13 | 13 | 13 |
| Specific Heat Capacity at 20°C (kJ/kg·K) | 0.46 | 0.46 | 0.46 |
| Melting Point (°C) | 1500 | 1500 | 1400 |
| Hardness Hv | 200 – 240 | 200 – 240 | 180 – 200 |
| Electric Resistance Temp. Coefficient | 33 × 10⁻⁶ | 15 × 10⁻⁶ | 58 × 10⁻⁶ |
| Increase from Oxidation 1200°C (mg/cm²·h) | 0.05 | 0.05 | 0.25 or less |
| Tensile Strength MPa (kgf/mm²) | 650 – 900 (65 – 90) | 650 – 900 (65 – 90) | 700 – 900 (70 – 90) |
| Magnetic Properties | Magnetic (Curie point 600°C) | Magnetic (Curie point 600°C) | Non-Magnetic |
Let's build your upgrade
Need Spiral Heaters built to your drawing?
Send us your chamber dimensions, temperature and cycle — we will respond with a technical proposal and quotation.