Heating Elements
FHL® ROB & FHL-MULTICORE® ROB Heaters
Rod-Over-Bend heaters in Fe-Cr-Al & Ni-Cr — including high-output FHL-MULTICORE®.
FHL® ROB (Rod Over Bend) heaters are our core specialization: precision-formed resistance heaters built from Fe-Cr-Al and Ni-Cr alloys. We manufacture single-core and FHL-MULTICORE® ROB heaters of any wire diameter.
Key features
FHL® single-core ROB heaters of any wire diameter
FHL-MULTICORE® ROB heaters — higher power in the same space
Fe-Cr-Al and Ni-Cr 80 alloys
Easy to replace — minimized furnace downtime
Custom-built to your exacting requirements
FHL-MULTICORE® features a specialized multi-core heating wire construction that delivers higher power input and faster heat-up times within the same furnace space compared with conventional single-core heaters. By distributing the electrical load across multiple heating cores, it reduces the surface loading on each core, supporting longer heater life while enabling higher power density and increased furnace output in a compact configuration. All ROB heaters are designed for easy replacement, simplifying maintenance and minimizing furnace downtime.
Custom-Built Parameters
- Wire
- Any wire diameter
- 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 |
Let's build your upgrade
Need ROB Heaters built to your drawing?
Send us your chamber dimensions, temperature and cycle — we will respond with a technical proposal and quotation.