0Cr21Al4 Resistance Heating Strip | FeCrAl FCHW-2 Alloy Foil & Ribbon

0Cr21Al4 (equivalent to FCHW-2 and OhmAlloy123) is an economical ferritic iron-chromium-aluminum (FeCrAl) electrical resistance heating alloy designed for continuous service temperatures up to 1100°C (2012°F). Engineered with high electrical resistivity (1.23 μΩ·m), a low temperature coefficient of resistance, and superior surface oxidation resistance, it forms a dense, adherent layer of aluminum oxide (Al2O3) at elevated temperatures. This protective oxide barrier delivers outstanding corrosion resistance and extended working life in high-temperature atmospheres, making 0Cr21Al4 strip and ribbon the preferred material for industrial heating elements, braking resistors, tubular heating units, and household appliances.

• Ferrous Chromium Aluminum alloy performance tables

Physical and Mechanical Properties Benchmark

Supply form and size tolerance standards

Key Engineering Advantages

• High Electrical Resistivity and Weight Savings: With a resistivity of 1.23 μΩ·m, 0Cr21Al4 delivers higher electrical resistance per unit cross-section than standard nickel-chromium alloys. Its lower density (7.35 g/cm³ vs 8.4 g/cm³ for NiCr) allows up to 15% material weight savings in equivalent heating element designs.
• Self-Healing Protective Oxide Film: During high-temperature exposure, the alloy forms a dense, non-spalling Al2O3 surface layer that prevents further thermal oxidation and resists carbonization and sulfur attack in industrial furnace environments.
• Thermal Stability up to 1100°C: Maintains mechanical integrity and stable resistance across long thermal cycles, preventing premature element sagging and hot-spot failure.
• Flexible Supply Conditions: Available in bright annealed soft condition for easy coiling and stamping, or hard-rolled condition (700+ MPa) for structural heating elements and rigid resistor grids.

Industrial Applications

• Industrial Heating Elements: Heating coils, open wire elements, and embedded infrared heaters for drying tunnels and industrial kilns.
• Power Braking Resistors: High-power dynamic braking resistor grids and load banks for locomotives, cranes, and heavy machinery.
• Home Appliance Heaters: Heating components for convection heaters, toasters, fan heaters, hand dryers, and storage heaters.
• Industrial Sealing and Packaging: Cutting wires, sealing strips, and impulse heat-sealing bands for packaging machinery.

 Quality Assurance and Inspection

1. 100% Traceability and MTC: Every batch is issued with an EN 10204 3.1 Mill Test Certificate detailing exact chemical composition, electrical resistivity, and mechanical tensile test results.
2.  Dimension and Resistance Inspection: Laser micrometer dimensional verification and multi-point micro-ohm resistance testing ensure tight tolerance consistency from coil start to end.
3. Surface Inspection: Strict eddy-current and visual checks ensure strip edges are slit clean without burrs, cracks, or surface scratches.

Packaging and Export Delivery Standards

1. Coil Packaging: Precision slit coils wound tight, wrapped in anti-corrosion VCI paper, and secured on wooden pallets with waterproof shrink film.
2.  Spool Packaging: Thin ribbons and narrow foils wound onto standard DIN spools (DIN 125, DIN 160, DIN 200) and boxed in heavy-duty export cartons.
3. Custom Marking: Custom waterproof labels showing Heat Number, Specification, Net Weight, Gross Weight, and Coil Length on each package.
4.  Fast Global Logistics: Regular export to Europe, North America, Southeast Asia, and the Middle East via Sea Freight, Air Freight, and Express Courier.

Frequently Asked Questions

Q1: What is the main difference between 0Cr21Al4 and 0Cr25Al5?

0Cr21Al4 has a nominal composition of 21% Cr and 4% Al with a maximum working temperature of 1100°C, offering higher cost efficiency for low-to-medium temperature heating applications. 0Cr25Al5 contains 25% Cr and 5% Al, with a higher maximum operating temperature of 1250°C and slightly higher electrical resistivity (1.42 μΩ·m).

Q2: Can 0Cr21Al4 strip be welded or soldered?

 FeCrAl alloys form a strong oxide layer that prevents traditional soldering. They are typically joined by spot welding, TIG welding, or mechanical clamping. Pre-cleaning the strip surface is recommended before welding.

Q3: What surface finishes are available for 0Cr21Al4 resistance strip?

We supply three standard surface conditions: Bright Annealed (clean, reflective finish for open elements), Pre-Oxidized (pre-formed dark oxide layer for immediate high-temperature service), and Acid Pickled (matte gray finish).

Q4: What is your standard lead time and sample policy?

Standard sample orders (up to 0.5 kg) can be dispatched within 48 hours. Mass production orders from 5 kg to 10 tons are typically delivered within 7 to 15 working days.