Hastelloy C22 & 622 Welding Wire
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Hastelloy C22 & 622 Welding Wire (ERNiCrMo-10) - TIG and MIG Filler Supplier in India
Nicorex Alloys is an ISO 9001 and ISO 14001 certified importer, stockist, and supplier of Hastelloy C-22 and 622 welding wire located in Mumbai, India. We supply these welding wires according to AWS A5.14 (ERNiCrMo-10).
The typical composition of C-22 alloy is 56% nickel, 22% chromium, 13% molybdenum, 4% iron and 3% tungsten. Its UNS designation is N06022 (W.Nr. 2.4602), with ASME Section IX group numbers F-43 and A-11. C-22 weld deposits help reduce acid resistance, and approximately 3% tungsten for pitting and localised corrosion control. HASTELLOY® C-22® RTW™ is the matching filler for C-22 alloy weld joints, while HASTELLOY® 622 RTW™ is an enriched-chemistry variant built to resist preferential weld corrosion in overlay and cladding work. ERNiCrMo-10 welding wire is commonly selected for aggressive oxidising chloride environments. This weld shows an improved resistance to localised attack even at temperatures near 95 °CThe filler is niobium-free, which removes the risk of Nb segregation during welding and makes it suitable for super-austenitic stainless steels such as 254 SMO and AL-6XN, as well as super duplex alloys like 2507.
We supply this alloy as TIG cut lengths, MIG spools, reels and coils from 0.8 to 4.0 mm (0.030–5/32″). It is widely used in chemical processing, pharmaceuticals, FGD pollution control, oil and gas and marine industries. Every batch comes with EN 10204/3.1B MTC, PMI reports and full heat traceability.
Hastelloy C-22 & 622 Welding Wire Specifications
The table below covers specifications, including classification, UNS designation, weld procedure, and diameters, of both Hastelloy C-22 and 622 welding wires in detail:
| 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-10
The AWS A5.14 designation ERNiCrMo-10 breaks down as follows:
| Prefix / Suffix | Meaning |
|---|---|
| ER | Electrode Rod – bare solid wire for GTAW/GMAW |
| Ni | Nickel-base filler |
| CrMo | Chromium-Molybdenum as principal alloying additions |
| -10 | Tenth registered Ni-Cr-Mo composition (C-22 chemistry: 22Cr-13Mo-3W) |
The SMAW coated electrode equivalent is ENiCrMo-10. Compared to ERNiCrMo-4 (C-276 chemistry), ERNiCrMo-10 carries higher Cr (22% vs 16%), lower Mo (13% vs 16%), and lower W (3% vs 4%). That Cr increase gives C-22 weld metal a stronger passive film for oxidising media. Unlike ERNiCrMo-3 (Alloy 625), ERNiCrMo-10 is completely niobium-free, which avoids Nb segregation in diluted welds on super-austenitic and super duplex steels.
Chemical Composition of ERNiCrMo-10 Weld Deposit (%)
The weld deposit chemistry per AWS A5.14 is provided below. A tighter sulfur limit of 0.01% (instead of 0.02% in some Ni-Cr-Mo fillers) makes the weld metal cleaner and reduces the risk of hot cracking.
| Ni | Cr | Mo | W | Fe | Co | C | Si | Mn | V | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Balance (~55–60) | 20.0–22.5 | 12.5–14.5 | 2.5–3.5 | 2.0–6.0 | 2.5 max | 0.015 max | 0.08 max | 0.50 max | 0.35 max | 0.02 max | 0.010 max |
All-Weld-Metal Mechanical Properties of Hastelloy C22 & 622 Welding Wire
Typical room-temperature all-weld-metal properties, including tensile and yield strength, elongation, and more, are listed below.
| Tensile Strength | Yield Strength, 0.2% Offset | Elongation | Charpy V-Notch Impact (RT) | Hardness |
|---|---|---|---|---|
| ~760-800 MPa (115 ksi) | ~450-550 MPa (61.5 ksi) | ~45% | >200 J | ~92 HRB |
Base Metal Compatibility & Dissimilar Joints of C22 Hastelloy Filler Wire
The compatibility of ERNiCrMo-10 with different nickel alloys, stainless steels, and carbon steels for welding and dissimilar metal joints is summarised below.
| Base Metal | UNS Number | ASME P-Number | ASTM Standard Reference |
|---|---|---|---|
| Alloy C-22 | N06022 | P-43 | B574, B575, B619, B622 |
| Alloy C-276 | N10276 | P-44 | Corrosion Resistance |
| Alloy C-4 | N06455 | P-43 | Thermal Stability |
| Alloy C-2000 | N06200 | P-44 | Versatile Corrosion Resistance |
| Alloy 625 | N06625 | P-43 | High Strength / Oxidation |
| Austenitic Stainless | Various (e.g., S31600) | P-8 | General Purpose |
| Carbon Steels | Various (e.g., K03006) | P-1 | Dissimilar Metal Joining |
A major benefit of ERNiCrMo-10 is that the weld metal contains no niobium (Nb). Standard Alloy 625 filler (ERNiCrMo-3) has about 3.5% Nb, which can segregate in welds on super-austenitic steels (254 SMO, AL-6XN) and super duplex 2507, reducing corrosion resistance. ERNiCrMo-10 avoids this problem and has higher molybdenum, so the weld metal usually matches or exceeds the corrosion resistance of the base metal.
Recommended Welding Parameters for Hastelloy C22 & 622 Welding Wire
Recommended welding parameters for ERNiCrMo-10 and ERNiCrMo-14 for GTAW (TIG) and GMAW (MIG) are summarised below.
| Parameter | GTAW (TIG) | GMAW (MIG) |
|---|---|---|
| Polarity | DCEN (electrode negative) | DCEP (electrode positive) |
| Shielding Gas | 100% Ar | 75% Ar / 25% He |
| Flow Rate | ~12 L/min (25 cfh) | ~16 L/min (35 cfh) |
| Wire Diameter | 1.6–3.2 mm (1/16–1/8″) | 0.9–1.2 mm (0.035–0.045″) |
| Current Range | 80–200 A | 150–300 A |
| Interpass Temperature | ≤93 °C (200 °F) | ≤93 °C (200 °F) |
| Preheat | None required | None required |
| PWHT | Not required | Not required |
Solution anneal the weld at 1121 °C (2050 °F), then cool it quickly to bring back full corrosion resistance. Always use 100% argon backing gas on the root pass, and keep your weave beads narrow to reduce heat input.
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Industrial Applications of C22 Hastelloy Filler Wire
ERNiCrMo-10 is used mainly in chemical processing, pharmaceutical plants, and FGD pollution control systems exposed to harsh mixed acids and oxidising chlorides.
ERNiCrMo-7 filler metal serves 4 main sectors where corrosion resistance and thermal stability are the key factors.
- Chemical Processing - Oxidising Chloride Environments: C-22 weld metal are capable of enduring exposure to ferric chloride, cupric chloride, heated chlorine solutions, or moist chlorine gas. Because of this stability, ERNiCrMo-10 becomes the standard choice for filling joints in reactors, heat exchange units and distillation columns dealing with acid-chloride mixtures.
- Pharmaceutical & Sanitary Processing: C-22 filler is preferred for high-purity sanitary tubing and process piping fabricated to FDA and ASME BPE standards.
- FGD & Pollution Control - Wet Scrubber Systems: In flue gas desulphurisation units, the linings of wet scrubbers, absorber shells, and stack liners are subjected to H₂SO₄, HCl, and chloride attack. ERNiCrMo-10 overlay wire protects the underlying carbon steel from these mixed acids at elevated temperatures, significantly increasing component service life.
Storage & Handling of Hastelloy C22 & 622 Welding Wire
- Store TIG rods and MIG spools in their original sealed packs in a clean, dry area below 50% humidity.
- store them at 15-30 °C
- Do not place heavy items on spool boxes.
- Before welding, wipe TIG rods with a lint‑free cloth lightly moistened with acetone.
- Use opened MIG spools within 7 days or reseal them with desiccant packs.
- Keep wires away from carbon steel tools and surfaces to avoid iron contamination and loss of corrosion resistance.
Available Forms & Packaging of Alloy C22 & 622 Welding Wire
Nicorex Alloys stocks ERNiCrMo-10 in the following forms, diameters, and provides multiple packaging options:
| Form | Diameter Range | Packaging Details |
|---|---|---|
| TIG Cut Lengths | 0.8 mm – 4.0 mm | 914 mm (36″) standard lengths, moisture barrier export packaging. |
| MIG Spools | 0.8 mm – 1.6 mm | 15 kg and 30 kg spools; moisture barrier export packaging. |
| Reels & Coils | Varies by system | Designed for automated GTAW/GMAW systems. |
| SMAW Coated Electrodes | 2.4 mm – 4.0 mm | Classified as ENiCrMo-10; moisture barrier export packaging. |
How to Order Hastelloy C22 & 622 Welding Wire From Nicorex Alloys
Provide the following details to receive a quotation for Hastelloy C22 & 622 welding wire.
- Wire Type — GTAW ERNiCrMo-10 / GMAW ERNiCrMo-10 only
- Size — Cut lengths or spools
- Current Type — DCEN with 100% Argon shielding gas
- Welding Position — All positions, including overhead and vertical
- Material Grade — N06022 / 2.4602 / ERNiCrMo-10 / ISO 18274
- Quantity — 5kg tubes or 15kg vacuum-sealed spools
- Standard — AWS A5.14 / ASME SFA 5.14
- Documentation — MTC EN 10204 3.1 and NACE compliance
- Packaging — Rigid tubes with PMI and Ferrite reports
- Delivery Destination — Domestic / International
Frequently Asked Questions
What is the price of Hastelloy C-22 (ERNiCrMo-10) welding wire per Kg in India?
ERNiCrMo-10 is a high-grade Ni-Cr-Mo-W filler metal. The price per kg varies with wire type, diameter, order quantity and nickel/molybdenum market rates. Contact Nicorex Alloys with your specifications for a current per-kg quotation.
What is the difference between HASTELLOY® C-22® and HASTELLOY® 622 welding wire?
Both are AWS A5.14 ERNiCrMo-10 fillers. C-22 RTW™ matches C-22 alloy and is used for butt joints, groove welds and fabrication. 622 RTW™ has richer chemistry for better weld corrosion resistance and is preferred for overlay and cladding on carbon or low-alloy steels.
Why is ERNiCrMo-10 (C-22) preferred over ERNiCrMo-4 (C-276) for oxidising chloride service?
ERNiCrMo-10 has 22% chromium compared with 16% in ERNiCrMo-4, giving a stronger protective film in oxidising environments. According to the results of wet chlorine tests, C-22 welds stayed sound at 95 °C, while C-276 welds failed at 65 °C.
Can ERNiCrMo-10 be used as an Nb-free overmatching filler for Super Duplex 2507?
Yes. ERNiCrMo-10 contains no niobium and has more molybdenum than 2507. This helps prevent the niobium segregation problems often seen with ERNiCrMo-3 (Alloy 625) in high‑dilution welds.
What ASTM base metal specifications does Hastelloy C-22 cover?
UNS N06022 base metal is covered under ASTM B574 (rod/bar), B575 (sheet/plate), B619 (welded pipe), B622 (pipe/tube) and B628 (fittings).
Is ERNiCrMo-10 wire suitable for welding C-276 base metal?
ERNiCrMo-10 can weld C-276 and usually gives better weld corrosion resistance than ERNiCrMo-4 in oxidising conditions.
Does Hastelloy C-22 welding wire require preheat or PWHT?
No.ERNiCrMo-10, like other C-type Ni-Cr-Mo fillers, does not need preheating or post‑weld heat treatment. Its very low carbon and silicon contents reduce carbide and silicide formation in the HAZ.
What is the critical crevice corrosion temperature (CCT) advantage of C-22 over C-276?
C-22 has a CCT of about 80 °C, while C-276 is about 55 °C. This 25 °C advantage makes C-22 more reliable in hot, chloride-rich process fluids, especially where crevices can trap highly corrosive chemicals.