TOKO 2535Nb NiCr Alloy MIG Welding Wire (Nb Stabilized)
Nickel-chromium‑niobium filler metal for gas metal arc welding of high‑temperature alloys. The niobium addition prevents carbide precipitation, ensuring excellent creep resistance and corrosion resistance in aggressive environments up to 1000°C.
Key Advantages
- AWS A5.14 ERNiCr‑3 compliant — full traceability and certified chemistry.
- Niobium stabilization — prevents intergranular corrosion and improves high‑T creep strength.
- Excellent feedability — precision layer‑wound spools for trouble‑free automatic welding.
- High deposition rates — boosts productivity compared to stick electrodes.
- Low spatter & smooth bead — minimal post‑weld cleaning.
- Available diameters: 0.8mm, 1.0mm, 1.2mm, 1.6mm.
Performance Benefits for Critical High‑Temperature Assets
- Oxidation & Sulfidation Resistance: Withstands aggressive flue gases and carburizing atmospheres.
- Thermal Fatigue Resistance: Maintains integrity under severe thermal cycling.
- Dissimilar Joints: Ideal for welding Ni‑alloys to stainless or heat‑resistant steels.
- PWHT flexibility: Can be used as‑welded or solution annealed.
- Clean Weld Metal: Low residuals, high purity for critical service.
Packaging: 5kg / 15kg spools, 250kg drums.
Primary Industrial Applications
Proven in the most demanding high‑temperature processes worldwide.
Furnace & Heat Treat
Radiant tubes, muffles, annealing covers, furnace rollers – resists thermal fatigue.
Petrochemical Reformers
Catalyst tubes, outlet manifolds, pigtails – withstands carburization and thermal cycling.
Power Generation
Boiler superheaters, reheaters, coal‑fired plant components – oxidation resistance up to 1000°C.
Aerospace
Afterburner components, exhaust systems, thermal processing fixtures.
Additional Applications & Industries
- Heat exchanger tubing for high‑temp processes
- Ammonia reformer assemblies
- Waste incineration plants (grate, liners)
- Glass manufacturing electrodes
- Ceramic‑lined pipe attachments
- Fluidized bed combustors
- Repair welding of HP‑modified alloys
Technical Specifications (Typical)
Chemical Composition (wt.%, AWS A5.14 ERNiCr-3)
| Element | Typical (2535Nb) | AWS Requirement |
|---|---|---|
| Nickel (Ni) | ≥67% | ≥67% |
| Chromium (Cr) | 20–23% | 18–22% |
| Niobium (Nb) | 2.5–3.5% | 2.0–3.0% |
| Manganese (Mn) | 2.5–3.5% | 2.5–3.5% |
| Iron (Fe) | ≤3.0% | ≤3.0% |
| Silicon (Si) / Carbon (C) | 0.2 / 0.02 | ≤0.5 / ≤0.10 |
Mechanical Properties (as-welded / after PWHT)
| Property | Value (RT) | At 900°C |
|---|---|---|
| Tensile Strength (MPa) | 620–720 | ≥180 (creep rupture) |
| Yield Strength (MPa) | 380–450 | — |
| Elongation (%) | 35–42 | — |
| Hardness (HB) | 160–200 | — |
| Oxidation scaling temp | Continuous: 1000°C / intermittent: 1150°C | |
Recommended MIG Welding Parameters (DC+, Ar + 2% O₂ or 100% Ar)
| Diameter (mm) | Current (A) | Voltage (V) | Wire feed speed (m/min) |
|---|---|---|---|
| 0.8 mm | 70–150 | 16–22 | 6–12 |
| 1.0 mm | 120–220 | 18–24 | 5–10 |
| 1.2 mm | 180–300 | 20–28 | 4–9 |
| 1.6 mm | 250–400 | 24–32 | 3–7 |
* Shielding gas flow: 18–25 L/min. Preheat only if required by base metal (typically 150–250°C for thick sections).
Certifications, Safety & Storage
- Classification: AWS A5.14 ERNiCr-3 / ISO 18274 S Ni 6082.
- Safety: Use adequate fume extraction – nickel/chromium compounds. Wear proper PPE.
- Storage: Store in original packaging in dry conditions. Reseal partially used spools.
Batch-specific MTCs traceable to EN 10204 3.1.
Why Choose TOKO 2535Nb MIG Wire?
- 🔬 Niobium stabilized — prevents intergranular corrosion after long‑term high‑T exposure.
- ⚡ Superior feedability — consistent wire delivery for robotic and semi‑automatic welding.
- 🧪 Proven in reformer tubes — extensive field history in ethylene furnaces.
- 📦 Globally stocked — rapid delivery for maintenance turnarounds.