The heating elements of a bundle rod heater are held in place by circular ceramic beads. They are made to last a long time and run without maintenance. These heaters, which can be installed either vertically or horizontally, are made and designed with low voltages to heat up more quickly. Ferritic alloys up to 1250°C and Ni Cr alloys up to 1100°C can supply the element. – NOBLEHEAT
1. Direct heating element wire
2. Ceramic Disc: for hold the heating element & insulation
3. Fiber Disc: for holds the terminal rod and prevent heat loss
4. Center Rod: for alignment & take the weight of heater bundle
| Heating element | Ferritic alloy powder metallurgical element, Mara FeCrAl, NiCr 80/20 |
| Watt Density | 1/10 W/cm² |
| Max. Temperature | Up to 1250°C |
| Cold resistance tolerance | ≤3% |
| Power | 1 kW to 75 kW |
| Heating Element Grade | Mara FeCrAl-Super | Mara FeCrAl-60 | Mara FeCrAl-55 | Mara FeCrAl-48 | Mara Nichrome-80/20 | |
|---|---|---|---|---|---|---|
| Standard chemical composition % | Al | 6 | 6 | 5.5 | 4.8 | Ni-80 |
| Cr | 23 | 23 | 23 | 23 | 20 | |
| Fe | Balance | Balance | Balance | Balance | 0 | |
| Max continuous operating temperature | °C | 1420 | 1400 | 1300 | 1200 | 1200 |
| Melting point | °C | 1500 | 1500 | 1500 | 1500 | 1400 |
| Electric resistivity at 20°C | μΩ·m | 1.45±5% | 1.45±5% | 1.40±5% | 1.42±5% | 1.08±5% |
| Density | g/cm³ | 7.1 | 7.1 | 7.2 | 7.2 | 8.4 |
| Thermal expansion factor 20°C ~ 1000°C |
°C⁻¹ | 14.8×10⁻⁶ | 13.6×10⁻⁶ | 13.6×10⁻⁶ | 14.8×10⁻⁶ | 17.6×10⁻⁶ |
| Tensile strength | N/mm² | 650~900 | 650~900 | 650~900 | 630~850 | 700~900 |
| Elongation | % | 15~25 | 15~25 | 15~30 | 10~30 | 20 or more |
| Hardness | HV | 220~240 | 220~240 | 220~240 | 220~240 | 150~190 |
| Repeat bending frequency | F/R | ≥5 | ≥5 | ≥5 | ≥5 | |
| Continuous service time | Hours/°C | ≥300/1300 | ≥300/1300 | ≥300/1300 | ≥100/1300 | ≥300/1200 |
| Magnetic properties | Magnetic | Magnetic | Magnetic | Magnetic | Non-Magnetic | |
| Specification | Details |
|---|---|
| Radiant Tube | Stainless steel SS grade, Incoloy, PMD, Cast alloys |
| Thickness of Tube | 1.5 to 8mm |
| Length of Tube | 300 to 5000mm (customize diameter & length) |
| Hangers | Mara FeCrAl, NiCr 80/20 |
| Flange | MS, SS grade |
| Thermocouple Pocket | Alumina Tube(ceramic) |
| Control | Thermocouple, RTD's, Thermostat |
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