# Cr30Ni70 Heating Wire

Cr30Ni70 is a high-nickel, high-chromium NiCr resistance alloy wire designed for long-term stable operation in high-temperature industrial electric heating systems.

Typical mix is around 70% nickel (Ni) + 30% chrome (Cr), not chasing max temps, but targeting:

- Steady resistance over long runs

- Solid structure when hot

- Low creep and failure in non-stop ops

In real jobs, Cr30Ni70 fits “stability and life first” industrial electric heating, not budget-tight projects.

## Key Features of Cr30Ni70

Cr30Ni70 is all about “stability and life first” in **[NiCr](https://cvsicelement.com/resistance-wire/nicr/)**.

- Up to 30% chrome builds a super dense, stable oxide layer at high heat, slowing oxidation way down.

- 70% nickel keeps it tough and creep-resistant when hot.

- Rock steady structure and resistance in 1000–1200°C, big win for long hauls.

- Perfect for 24/7 non-stop, not chasing cheap.

Cr30Ni70 wins from “stable mix → stable structure → steady performance long-term.”

## Cr30Ni70 (Ni70Cr30, High-Chrome Type) Specs Table

ItemValueAlloy NameCr30Ni70Equivalent SystemNichrome 70/30 (high-chrome type)Common AliasesNi70Cr30, Nichrome 70/30, NiCr70/30Composition (%)Ni: Bal. (about 70%), Cr: 28–31%, Fe: ≤1.0%Max Temp1200°C (top in NiCr series)Resistivity (20°C)1.18 μΩ·mDensity8.1 g/cm³Thermal Conductivity45.2 KJ/m·h·°CExpansion Coefficient17×10⁻⁶/°CMelting Point1380°CElongation>20%MicrostructureAusteniticMagneticNon-magneticStandout TraitsTop oxidation fight – Great high-temp strength – Built for long continuous runs – Better heat stability/corrosion than 20Cr seriesCommon UsesIndustrial furnace wires – High-temp elements – Ceramic heaters – High-temp ovens/tunnel kilns – Mold heating, lab furnacesAvailableDiameters: 0.02–10mm (round) Strips: 0.02–2mm Custom flat wire, rods, coilsProcessingOEM/ODM, fixed resistance, cut-to-length, surface oxidation, vacuum annealing, etc.

Cr30Ni70 shines in “time stability” at 1000–1200°C, not just peak temp.

## Typical Cr30Ni70 Spots

**High-temp industrial electric furnaces**

- Heating wires, strips, meshes

- Needs even temps and reliable runs

**Non-stop electric heating (24/7)**

- Low resistance drift

- Low break risk

- Beats mid-nickel NiCr easy

**Precision heat treat/temp control gear**

- Cuts drift from aging

- Keeps params steady long-term

**Premium OEM standard stuff**

- Great for long bulk supply

- Engineering consistency

### Usage Tips & Limits

**Long-term ≤1150–1200°C**

- Still watch loads—don’t just crank temp.

**Pricey—not for super cheap projects.**

## Cr30Ni70 Selection Comparison

| Feature | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 |
| --- | --- | --- | --- |
| Nickel | High | Super High | Medium |
| Chrome | Medium | High | Low |
| Oxidation Fight | Strong | Top-Notch | Solid |
| High-Temp Strength | Solid | Rock-Solid | Average |
| Resistance Stability | High | Top-Notch | Medium |
| Continuous Life | Long | Longer | Medium |
| Cost | Higher | Highest | Medium |

NiCr picks are about managing risks, not just temp numbers.

When aiming for long stable runs, low maintenance, high consistency over lowest cost, Cr30Ni70 is the top NiCr choice.

## CVSIC Custom Options

We offer engineering-grade for Cr30Ni70 NiCr resistance wire:

- Diameters: Common industrial (custom too)

- Forms: Coils, straight, cut-to-length

- Extras: Coiling, shaping, pre-fab components

- Models: Wholesale, OEM, ODM

- Customers: Makers, engineering firms, system integrators

Perfect for premium long-term kits and project buys.

## Quality Control | Batch Consistency Wins

- Steady NiCr melt/composition control

- Double checks resistivity/diameter

- High-temp aging/oxidation tests

- Traceable batches for repeat projects

We care about “qualified” plus consistent engineering performance across batches.

Cr30Ni70 NiCr **[resistance wire](https://cvsicelement.com/resistance-wire/)** isn’t cheap—it’s made for high-temp, long-term, stable industrial electric heating.

If you’re after: Less maintenance · Longer life · Steadier heating — Cr30Ni70 is worth putting first.

## FAQs

### Long-term at 1200°C?

In air, keep ≤1150–1200°C long-term with smart loads for best life.

### Main edge over Cr20Ni80?

Better high-temp strength, creep fight, long-term resistance stability—killer for continuous systems.

### Good for frequent on-off?

Yeah—high-nickel austenitic handles cycles better.

### Standard for premium gear?

Totally—great for OEMs watching life, consistency, maintenance costs.

### Custom and steady supply?

You bet—tailored specs/stable bulk for projects.