HASTELLOY® C-4 Welding Wire
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HASTELLOY® C-4 Welding Wire (ERNiCrMo-7) — TIG Filler Rod & MIG Wire Supplier in India
Nicorex Alloys is an ISO 9001 and ISO 14001 certified Mumbai-based supplier of HASTELLOY® C-4 TIG rods and MIG welding wire. We provide these wires classified under AWS A5.14 ERNiCrMo-7 (UNS N06455).
The weld deposit delivers approximately 16% chromium and 16% molybdenum with a nickel balance of roughly 65%, and zero tungsten or niobium. This dual Cr-Mo balance resists both oxidising and reducing chemical environments. Prolonged exposure of conventional Ni-Cr-Mo weld deposits between 650 and 1038 °C (1200–1900 °F) can trigger harmful intermetallic phases such as µ-phase and P-phase. HASTELLOY C-4 welding wire avoids this problem through a tungsten-free Ni-Cr-Mo chemistry that delivers superior thermal stability in this critical temperature band, maintaining ductility and corrosion resistance under extended high-temperature service. Hastelloy C-4 weld metal has a tensile strength of about 110 ksi (758 MPa) and 40–50% elongation, so it stays ductile even after repeated heating and cooling. It is compatible with P-43 Ni-Cr-Mo alloys and is suitable for welding to stainless steels and carbon steels.
Hastelloy C-4 welding wire is used in high-temperature chemical plants, nuclear fuel reprocessing, heat treatment fixtures, and corrosion‑resistant overlay cladding on steel. It is typically welded using GTAW (TIG) or GMAW (MIG), with no preheating or post‑weld heat treatment required. Nicorex Alloys supplies this wire with EN 10204/3.1B mill test certificates, PMI checks, and full heat‑lot traceability as per ASME SFA 5.14.
Hastelloy C-4 Welding Wire Specifications
The table below lists the full specification set for Hastelloy C-4 TIG rods, MIG spools, and SMAW electrodes:
| AWS Classification (TIG/MIG) | ERNiCrMo-7 |
|---|---|
| AWS Classification (SMAW) | ENiCrMo-7 (AWS A5.11) |
| UNS Designation | N06455 |
| Shielding Gas (GTAW/GMAW) | 100% Argon |
| Polarity | GTAW: DCEN | GMAW/SMAW: DCEP |
AWS Classification Explained: ERNiCrMo-7 (TIG/MIG Wire)
ERNiCrMo-7 (TIG-MIG wire) AWS classification is explained in the table below, including its designation element, meaning and details:
| Designation Element | Meaning | Details |
|---|---|---|
| ER | Electrode / Rod | Bare wire used for GTAW (TIG) and GMAW (MIG) welding processes |
| Ni | Nickel-base | Indicates the alloy is primarily nickel-based |
| Cr | Chromium | Principal alloying element for corrosion resistance |
| Mo | Molybdenum | Improves pitting, crevice corrosion resistance, and strength |
| –7 | Alloy identification number | Seventh registered NiCrMo composition in the AWS classification system |
Chemical Composition of ERNiCrMo-7 Weld Deposit (%)
The chemical composition of ERNiCrMo-7 Weld Deposit, along with its proportions, is listed in the table below.
| Nickel (Ni) | Chromium (Cr) | Molybdenum (Mo) | Iron (Fe) | Carbon (C) | Silicon (Si) | Manganese (Mn) | Cobalt (Co) | Titanium (Ti) | Phosphorus (P) | Sulphur (S) | Tungsten (W) | Niobium (Nb) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Balance (∼65) | 14.0–18.0 | 14.0–17.0 | 3.0 max | 0.015 max | 0.08 max | 1.0 max | 2.0 max | 0.70 max | 0.04 max | 0.03 max | Not permitted | Not permitted |
Combined with very low C (0.015% max) and Si (0.08% max), these restrictions make C-4 the most thermally stable of all C-type alloys. The weld HAZ stays free of sensitisation even under slow cooling.
All-Weld-Metal Mechanical Properties of ERNiCrMo-7
Typical room-temperature mechanical properties of the Hastelloy C-4 welding wire are mentioned below in the table
| Property | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
|---|---|---|---|
| Typical Value | ∼110 ksi (758 MPa) | ∼55–65 ksi (379–448 MPa) | ∼40–50% |
Base Metal Compatibility & P-Number Matrix for ERNiCrMo-7
The table given below lists the base metal and its compatibility with the wires, along with the P-number.
| Base Metal | Grade | ASME No. | Notes |
|---|---|---|---|
| Nickel-Chromium-Molybdenum Alloy | Hastelloy C-4 (UNS N06455) | P-43 | Matching base metal for ERNiCrMo-7 filler; commonly supplied under ASTM B574, B575, B619, B622, B626 |
| Nickel-Chromium-Molybdenum Alloy | Hastelloy C-276 | P-43 | Compatible welding using ERNiCrMo-7 for similar Ni-Cr-Mo alloy joints |
| Nickel-Chromium-Molybdenum Alloy | Hastelloy C-22 | P-43 | Suitable for welding with ERNiCrMo-7 in corrosion-resistant service |
| Austenitic Stainless Steel | 304 / 316 / 317 | P-8 | Used for dissimilar welding with Ni-Cr-Mo alloys |
| Carbon Steel | Various grades | P-1 | ERNiCrMo-7 handles dilution effectively in dissimilar welds |
Under ASME Section IX, ERNiCrMo-7 carries F-Number F-43 and A-Number A-11, enabling WPS qualification for P-43 nickel alloys and various dissimilar P-Number welding combinations.
Recommended Welding Parameters for Hastelloy C-4 Wire
The table explains recommended welding practices for Hastelloy C-4 wire, including processes, shielding gas, temperature limits, cleaning procedures, and heat treatment guidance.
| Diameter (mm) | Position | Wire Feed | Current (A) | Voltage (V) |
|---|---|---|---|---|
| 1.6 | Flat / Horizontal | Low–Moderate | 70–110 | 10–13 |
| 2.4 | Flat / Horizontal | Moderate | 90–150 | 11–14 |
| 3.2 | Flat | Moderate–High | 120–180 | 12–15 |
Maintain ≤93 °C interpass temperature. Use 100% argon shielding with root purge. No preheat required. Clean passes with a stainless brush. PWHT unnecessary; solution anneal 1066 °C followed by water quench.
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Industrial Applications of Hastelloy C-4 Welding Wire
ERNiCrMo-7 filler metal serves 4 main sectors where corrosion resistance and thermal stability are the key factors.
- Chemical Processing at Elevated Temperature: C-4 weld joints are ideal for reactors and heat exchangers above 500 °C in H₂SO₄, HCl, and mixed-acid media.
- Nuclear & Radiation Processing Applications: In nuclear fuel reprocessing and radioactive waste handling, C-4 welding wire maintains corrosion resistance and microstructural stability for long service periods.
- High-Temperature Equipment & Heat Treatment Fixtures: ERNiCrMo-7 welds withstand repeated heating between 650–1038 °C without forming brittle phases, making them suitable for fixtures, retorts, and muffle assemblies.
- Overlay Cladding for Elevated-Temperature Corrosive Service: Hastelloy C-4 CRA overlay on carbon steel vessels combines steel strength with Ni-Cr-Mo corrosion resistance while staying ductile after thermal cycling in refining and petrochemical service.
Available Forms & Packaging
TIG rods come in standard 1000 mm straight lengths that fit most welding setups. If needed, Nicorex Alloys can also provide special packaging and custom lengths for specific project requirements.
| Form | Diameter | Packaging |
|---|---|---|
| TIG Rods (ERNiCrMo-7) | 1.6 mm, 2.4 mm, 3.2 mm | Standard tubes |
| MIG Wire / Spools (ERNiCrMo-7) | 0.8 mm, 1.0 mm, 1.2 mm | 15 kg (33 lb) and 12.5 kg standard spools |
| SMAW Electrodes (ENiCrMo-7) | 2.5 mm, 3.2 mm, 4.0 mm (core diameter) | Standard electrode packaging |
How to Order from Nicorex Alloys
To order HASTELLOY C-4 Welding Wire, provide these 10 important instructions:
- Wire Type — GTAW / GMAW Solid Wire for Nickel-Chromium-Molybdenum Alloy Welding (ERNiCrMo-7)
- Size — 1.2mm (GMAW spools) / 1.6mm / 2.4mm / 3.2mm (GTAW cut lengths)
- Current Type — DCEN (GTAW) / DCEP (GMAW)
- Welding Position — All Positions
- Material Grade — Hastelloy C-4 Welding Wire / UNS N06455 / AWS A5.14: ERNiCrMo-7 / W.Nr. 2.4610
- Quantity — Number of spools/packs or total weight in kg
- Standard — AWS A5.14 / ASME SFA 5.14 (ERNiCrMo-7), EN ISO 18274: S Ni 6455, ASME Section IX
- Documentation — MTC EN 10204 3.1/3.2, PMI Report, Weld Metal Composition Report, Mechanical Properties Report, TPI Certificate
- Packaging — Vacuum-sealed foil bag with silica gel desiccant, ISPM 15-compliant export cartons with full labelling
- Delivery Destination — Domestic
Frequently Asked Questions
What is the price of Hastelloy C-4 (ERNiCrMo-7) Welding Wire per kg in India?
ERNiCrMo-7 is a premium Ni-Cr-Mo filler priced above standard stainless steel consumables. Cost per kg depends on diameter, form, order quantity, and current nickel market rates. Contact Nicorex Alloys for a competitive quotation.
What is the key advantage of C-4 (ERNiCrMo-7) over C-276 (ERNiCrMo-4) Welding Wire?v
Thermal stability is the primary advantage. C-4 contains zero tungsten, so it avoids µ-phase and P-phase precipitation in the 650–1038 °C range. C-276 contains 4% tungsten, which makes it more likely to form these harmful TCP phases during long exposure to high temperatures. This causes the alloy to become brittle and less corrosion-resistant.
What ASME P-Number applies to Hastelloy C-4 Base Metal?
P-43 applies to Ni-Cr-Mo alloys that contain more than 31% nickel. ERNiCrMo-7 filler carries F-43 and A-11 per ASME Section IX Tables QW-432 and QW-442.
Can ERNiCrMo-7 be used for Dissimilar Joints between C-4 and Stainless Steel?
Yes. Nickel-base fillers prevent dilution cracking at dissimilar interfaces. ERNiCrMo-7 suits joints between C-4 and 304, 316, or 317 stainless steels and carbon steel substrates.
Does Hastelloy C-4 Welding Wire require Post-Weld Heat Treatment?
No PWHT is required. The ultra-low C (0.015% max) and Si (0.08% max) content prevents HAZ sensitisation. If maximum corrosion performance is needed after heavy cold work, a solution anneal at 1066 °C (1950 °F) followed by water quench may be applied.
Is ERNiCrMo-7 suitable for Submerged Arc Welding (SAW)?
SAW can be used for Ni-Cr-Mo alloys, but it is not recommended. Its high heat input can cause the weld metal to segregate and increase the chance of hot cracking.
What spool sizes are available for ERNiCrMo-7 MIG Wire?
Standard spool weights are 15 kg (33 lb) and 12.5 kg. Custom spool sizes and bulk reels are available on request from Nicorex Alloys.