Heating Elements
FHL® SOB Heaters
Strip-Over-Bend heaters in Fe-Cr-Al & Ni-Cr — multiple strip sizes.
FHL® SOB (Strip Over Bend) heaters are precision-formed strip heaters built from Fe-Cr-Al and Ni-Cr alloys. We manufacture SOB heaters in multiple strip sizes to match chamber geometry and power density.
Key features
FHL® SOB heaters with multiple strip sizes
Fe-Cr-Al and Ni-Cr 80 alloys
Easy to replace — minimized furnace downtime
Custom-built to your exacting requirements
All SOB (Strip Over Bend) heaters are designed for easy replacement and manufactured to suit your specific requirements. Each heater can be custom-built to your drawings, samples, or furnace and application requirements, ensuring a precise fit and seamless integration with your specifications.
Custom-Built Parameters
- Strip
- Multiple strip sizes
- Alloys
- Fe-Cr-Al Alloy 1 & 2 · Ni-Cr 80
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 |
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View specificationsLet's build your upgrade
Need SOB Heaters built to your drawing?
Send us your chamber dimensions, temperature and cycle — we will respond with a technical proposal and quotation.