# 0Cr21Al6 Resistance Wire

0Cr21Al6 is an iron-chrome-aluminum (Fe-Cr-Al) based **[FeCrAl](https://cvsicelement.com/resistance-wire/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:

- Matching diameter to surface load

- Picking a safe long-term temp

- Good supports with room for expansion

- 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.