Core Value
The High Temp Ni80Cr20 Spiral Resistance Wire Heating Coil is engineered for high-power thermal radiation and conduction in industrial furnaces, laboratory kilns, commercial ovens, and specialized heating elements. Formulated from premium 80% Nickel and 20% Chromium (Ni80Cr20 / Kanthal NIKROTHAL 80 Equivalent) alloy, this precision-wound spiral heating coil forms a tight, protective chromium oxide ($\text{Cr}_2\text{O}_3$) surface layer under high thermal loads, effectively preventing internal oxidation and structural degradation.
Designed for continuous operation at temperatures up to 1200°C (2192°F), Ni80Cr20 provides unmatched hot mechanical strength and creep resistance compared to iron-based alloys, eliminating coil deformation and sagging under prolonged heating cycles. Featuring precise CNC coil pitch spacing and optional cold-tail terminal leads, it ensures stable electrical resistance, low contact resistance, and uniform surface load distribution. BACKED BY 30+ YEARS MANUFACTURING EXPERIENCE and UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS for guaranteed electrical uniformity and zero-defect heating performance.
- ✓ Extreme Temperature Endurance: Operates continuously at temperatures up to 1200°C (2192°F) without structural sagging or thermal fatigue.
- ✓ Protective Oxide Layer: Self-healing chromium oxide film prevents atmospheric oxidation and extends coil operational lifespan.
- ✓ Non-Magnetic Matrix: Pure Ni80Cr20 alloy matrix remains 100% non-magnetic, maintaining electrical stability in electromagnetic environments.
- ✓ Superior Hot Strength: High resistance to thermal creep keeps horizontal and vertical spiral coils perfectly aligned inside grooves or tubes.
- ✓ Post-Use Ductility: Retains high flexibility even after extensive high-heat cycles, allowing easy maintenance, re-stretching, or welding.
- ✓ Custom Wire & Coil Sizes: Precision coiling for outer diameters (OD), pitch ratios, wire gauges (AWG/mm), and custom power ratings.
- ✓ Reliable Quality: 30+ YEARS MANUFACTURING EXPERIENCE guarantees precise wire drawing, uniform coil geometry, and exact resistance per meter.
- ✓ Quality Assured: UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS including cold resistance verification, high-voltage insulation, and dimension checks.
- ✓ Global Compliance: CE, RoHS, ISO 9001, and ISO 14001 certified.
Technical Specifications & Performance Data
| Parameter | Standard Value | Customizable Range | Notes |
| Alloy Composition | Ni80Cr20 (80% Nickel, 20% Chromium) | Ni70Cr30 / Custom NiCr Compositions | Equivalent to NIKROTHAL 80 / Chromel A |
| Max Working Temp | 1200°C (2192°F) Continuous | Peak exposure up to 1250°C | Superior oxidation resistance under cyclic heating |
| Wire Diameter | Ø 0.3 mm – Ø 6.0 mm | AWG 28 to AWG 2 / Custom Gauges | Precision drawn to ±0.01 mm tolerance |
| Coil Outer Diameter (OD) | Ø 5.0 mm – Ø 100 mm | Built to customer tube or groove ID | CNC wound to prevent pitch overlap |
| Resistivity (20°C) | 1.09 ± 0.05 μΩ·m | Standard NiCr 80/20 value | Stable electrical resistance over extended use |
| Density | 8.40 g/cm³ | High nickel density matrix | High thermal mass & structural durability |
| Melting Point | 1400°C (2552°F) | Physical thermal property | Generous safety margin above working limits |
| Terminal Ends | Straightened Leads / Welded Cold Tails | Single or Multi-Strand Twisted Leads | Keeps terminal wire cool at wall penetrations |
| Warranty | 1 Year Standard | Extended coverage available | Guaranteed against manufacturing defects |
Industrial Applications & Solutions
- Industrial Heat Treatment Furnaces: Spiral heating elements for annealing, hardening, stress-relieving, and tempering furnaces.
- Commercial & Laboratory Kilns: High-reliability heating coils mounted on ceramic support rods or laid inside refractory grooved bricks.
- Radiant Tube & Bobbin Heaters: Internal spiral cores inserted into metal alloy radiant tubes and ceramic bobbin cores for indirect heating.
- Plastics & Hot Runner Equipment: Internal heating elements for heavy-duty cartridge heaters, nozzle heaters, and cast heating plates.
- Commercial Food & Catering Equipment: Heavy-duty heating coils for commercial bakery ovens, pizza ovens, fryers, and thermal holding cabinets.
HT-Heater vs Standard Market Heating Coils
| Feature | HT-Heater NiCr 8020 Coils | Standard Market Coils | Your Advantage |
| Alloy Purity | 100% Virgin Melt Ni80Cr20 Alloy | Recycled Scrap Metal / Low-Grade Ni | Zero localized hot spots, zero premature wire burnouts |
| Coil Pitch Precision | Automatic CNC Precision Coiling | Irregular Manual Coiling Pitch | Prevents short circuits between adjacent turns |
| Thermal Creep Resistance | High Hot Strength (Zero Sagging) | Softens / Sags below 1000°C | Maintains coil spacing inside horizontal & vertical channels |
| Ductility After Heat | Remains Ductile & Weldable | Becomes Brittle & Snaps | Simple maintenance and easy terminal connection adjustments |
| Manufacturing Exp. | 30+ YEARS EXPERIENCE | Unverified Workshops | Engineered pitch ratios and surface watt density optimization |
| Quality Assurance | MULTIPLE RIGOROUS QUALITY CHECKS | Basic Resistance Check Only | ZERO DEFECT DELIVERY |
Installation & Integration Guidelines
- Uniform Stretch Ratio: When installing compressed spiral coils, stretch the coil uniformly to achieve a pitch ratio of 2 to 3 times the wire diameter. This prevents adjacent turns from touching and short-circuiting.
- Channel & Tube Cleaning: Thoroughly clean ceramic support tubes, mica insulation, or refractory brick grooves of any metallic particles, carbon deposits, or slag before inserting the new coil.
- Cold Terminal Passthrough: Ensure straightened cold-tail terminal leads pass completely through the thermal insulation wall. Use ceramic insulating beads or sleeves to prevent grounding against outer metal housings.
- Secure Terminal Connections: Secure cold lead ends using heavy-duty stainless steel or nickel mechanical screw clamps, or TIG weld them to external power lines. Avoid soft soldering.
- Initial Commissioning Burn-In: Heat new coils gradually to 300°C to bake off residual handling oils, then hold at 800°C for 1 hour to establish a continuous protective chromium oxide film.
Customer Success Stories
Case 1:
Industrial Oven OEM (France)
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Application: High-power convection curing ovens operating continuously at 850°C.
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Challenge: Standard heating coils sagged over time, causing short circuits against internal metal baffles.
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Solution: High Temp Ni80Cr20 Spiral Resistance Wire Heating Coils with custom pitch spacing.
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Results: COIL SERVICE LIFE INCREASED BY 3X. “The hot creep strength of HT-Heater’s NiCr 8020 is exceptional. Zero sagging even after 12 months of continuous operation. HT-Heater UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS, and electrical resistance from batch to batch is perfectly uniform.”
Case 2:
Lab Equipment Manufacturer (USA)
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Application: High-precision muffle furnace heating elements operating up to 1150°C.
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Challenge: Premature coil burnout and resistance drift on lower-grade resistance coils.
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Solution: Precision-wound Ni80Cr20 Spiral Coils with long straightened cold tails.
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Results: REJECT RATES DROPPED TO ZERO. “30+ YEARS MANUFACTURING EXPERIENCE is evident in their winding accuracy. Coil pitch is perfectly uniform, and thermal distribution across the furnace chamber is flawless.”
Pricing & Procurement Options
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Standard Production: MOQ 100 meters per gauge/color. BACKED BY 30+ YEARS MANUFACTURING EXPERIENCE ensuring exact spooling and resistance calibration uniformity. Tiered volume discounts available for 1,000+ meter orders.
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Lead Times: Standard Stock Gauges (AWG 24 / AWG 20 in ANSI & IEC colors): In stock, 3-5 days. Custom Shielding, Special Gauges, or Multi-Pair Cables: 7-10 days. Express air dispatch available.
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Global Logistics: Supplied on standard 100m/200m/500m spools or heavy reels. Packed in moisture-proof wrap and sturdy export cartons.
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Sample Orders: Free sample wire lengths available upon request for millivolt output and resistance testing. Every shipment UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS prior to dispatch.
Global Certifications & Compliance
- CE Marking
Fully compliant with European safety and environmental standards. - LVD Compliance
Low Voltage Directive tested for continuous thermal load safety. - RoHS Compliant
Constructed using environmentally safe, lead-controlled brass alloys. - ISO 9001
Certified quality control covering CNC machining, coil pressing, and electrical testing.
Quality Documentation: Certificate of Conformity (COC) and insulation resistance test reports included.
Comprehensive After-Sales Support
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- Warranty: 1-Year Comprehensive Warranty covering internal heating element and built-in sensor.
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Technical Support: Application engineers available for wattage distribution calculation, thermocouple calibration, and nozzle fitting assistance.
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Global Response Network: BACKED BY 30+ YEARS MANUFACTURING EXPERIENCE with technical inquiry feedback within 2 hours.
Ready to Optimize Your Injection Molding?
Next Steps:
- 📧 Request Custom Quote – Send your nozzle dimensions, wattage, voltage, and HT-CLW-450 drawing requirements.
- 🔧 Free Design Consultation – Work with our thermal engineers to optimize heat distribution and lead insulation.
- 📦 Order Test Samples – Evaluate thermal performance on your injection molding machine.
- 📞 Contact Hot Runner Experts – Response within 2 hours
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