0Cr21Al6 Resistance Wire

0Cr21Al6 is an iron-chrome-aluminum (Fe-Cr-Al) based FeCrAl high-temperature resistance alloy that’s super common in industrial electric heating setups.

Thanks to steady resistance, killer oxidation resistance, and reliable performance at high heat, it’s a go-to material for 1300°C-level industrial heating jobs.

Key Features of 0Cr21Al6 High-Aluminum FeCrAl Alloy

By bumping up the aluminum to around 6%, 0Cr21Al6 gets way better at fighting oxidation in hot air.

• Aluminum ≈6% means a tighter, stickier oxide layer—perfect for furnaces running in plain air (not vacuum or shielded gas).
• Higher resistivity (about 1.45 μΩ·m) packs more power into the same length—great for compact designs.
• Best for steady runs at 1200–1250°C; can hit 1300°C short-term, but don’t push it every day.
• Downside: Trickier to work cold—can crack when coiling, so it usually needs annealing.

The big win with 0Cr21Al6 is rock-solid oxidation resistance in high-temp air.

Composition & Basic Specs

Item	Parameter
Alloy Grade	0Cr21Al6 (FeCrAl 216)
Main Chemical Composition (%)	Fe: Bal.; Cr: 20–22; Al: 5.0–7.0; Mo: ≤0.5
Max Continuous Temp	1250–1300°C
Resistivity (20°C)	1.35 μΩ·m
Density	7.1 g/cm³
Thermal Conductivity	16 KJ/m·h·°C
Expansion Coefficient	14 ×10⁻⁶/°C
Melting Range	1500–1520°C
Tensile Strength	≥650 MPa (wire)
Elongation	≥15%
Microstructure	Ferritic
Magnetic	Yes
Key Features	Top-notch oxidation resistance, perfect for high-temp furnaces, long-lasting, and budget-friendly
Common Uses	Heating tubes, ovens, space heaters, humidifiers, dryers

How It Handles High Temps & Oxidation

In hot air, the aluminum on the surface reacts with oxygen to build a dense, solid Al₂O₃ protective layer.

This layer:

• Keeps extra oxygen from sneaking in deeper
• Slows down ongoing oxidation
• Boosts stability at high heat
• Makes heating elements last way longer

That’s why 0Cr21Al6 shines in electric heating that stays exposed to air long-term.

Temp Ratings & Use Range

Spec	Details
Recommended Long-Term Temp	≤ 1300°C
Short-Term Max	Up to 1350°C (depends on wire size and load)
Heating Style	Resistive
Heat Stability	Holds structure well at high temps

With smart power loading and design, 0Cr21Al6 gives steady, predictable performance at high heat.

Where It Gets Used

You’ll find 0Cr21Al6 in all sorts of industrial and lab spots:

• Heating wires in industrial resistance furnaces
• Box furnaces and lab furnaces
• High-temp air heaters
• Ceramic, glass, and heat treatment gear
• Research and lab heating systems

Usage Tips & Limits

Long-term continuous temp ≤ 1250–1300°C

• Go over that too often and the oxide layer grows way faster
• Long runs past the limit thin out the wire and shift resistance more

Skip strongly reducing or sulfur-heavy air

• Stuff like H₂, CO, or sulfides wreck the protective alumina
• Life drops big time in those setups

Wire size sets your temp ceiling

• Thin wires (≤0.5 mm) overheat easier at high loads
• Always calc max surface load (W/cm²) from the diameter

Don’t stress it mechanically when hot

• It gets less ductile at temp
• Avoid tension or vibes during operation

Its reliability and flexibility make it a solid pick for mid-to-high temp industrial heating.

Practical Engineering Perks

• Steady resistance makes power math easy
• Oxidation resistance fits air environments perfect
• Works with all kinds of element shapes
• Decent to form and coil
• Not for heavy reducing or sulfur air

Design & Selection Tips

When building with 0Cr21Al6, zero in on:

1. Matching diameter to surface load
2. Picking a safe long-term temp
3. Good supports with room for expansion
4. Making sure the air is oxidizing enough

Nail the structure and power, and you’ll get the most out of this alloy.

Supply Options & Custom Work

We offer:

• Bunch of wire diameters
• Custom lengths and resistance
• Big industrial batches
• Tech specs and selection help

Great for equipment makers, furnace builders, and system integrators.

0Cr21Al6 is a solid FeCrAl high-temp resistance alloy with steady resistivity and great oxidation resistance—perfect for industrial electric heating in air up to around 1300°C.

FAQs | Common Questions

What atmospheres work best?

Mainly plain air or mildly oxidizing—not good for strong reducing or sulfur stuff.

Recommended temp?

Keep long-term under 1300°C; short bursts can go higher depending on your setup.

Custom diameters and resistance?

Yeah, we can tailor to your voltage, power, and design needs.

Good for non-stop running?

Totally—handles continuous high heat when designed right.