ERNiFeCr-2 (UNS N07718) is a nickel-chromium-iron based filler metal strengthened by niobium, molybdenum, titanium, and aluminum. It is specifically designed for welding Inconel® 718 and other precipitation-hardening nickel alloys, as well as for dissimilar joints requiring high strength and oxidation resistance up to 700°C (1300°F).
This wire delivers excellent weldability, high resistance to post-weld strain-age cracking, and consistent mechanical properties after appropriate heat treatment. It is widely used in gas turbine engines, rocket components, high-temperature fasteners, tooling, and nuclear reactors.
The wire provides smooth arc characteristics, low spatter, and good wetting, making it suitable for demanding fabrication projects where reliability at elevated temperatures is critical.
ERNiFeCr-2
| Standard | Classification |
| AWS A5.14 | ERNiFeCr-2 (UNS N07718) |
| EN ISO 18274 | S Ni 7718 (NiFe19Cr19Nb5Mo3) |
| ASME IX | F-No. 45 |
| Element | Ni | Cr | Fe | Nb+Ta | Mo | Ti | Al |
| Content (%) | 50.0–55.0 | 17.0–21.0 | Remainder | 4.75–5.50 | 2.80–3.30 | 0.65–1.15 | 0.20–0.80 |
| C | Mn | Si | P | S | B | Cu | Co |
| ≤ 0.08 | ≤ 0.35 | ≤ 0.35 | ≤ 0.015 | ≤ 0.015 | ≤ 0.006 | ≤ 0.30 | ≤ 1.0 |
The controlled addition of Nb, Ti, and Al enables precipitation of γ'' and γ' phases during aging heat treatment, delivering high tensile and creep strength at elevated temperatures.
Aging heat treatment per AWS A5.14:
1325°F (720°C) / 8 hours, furnace cool at 100°F (55°C)/hour to 1150°F (620°C) / 8 hours, air cool.
| Property | AWS Standard (min.) | Typical Value (aged) |
| Tensile Strength | ≥ 1138 MPa (165 ksi) | ≥ 1200 MPa |
| Yield Strength (0.2% offset) | Not specified | ≥ 950 MPa |
| Elongation (4d) | Not specified | ≥ 15% |
Ø Precipitation-hardening Ni-Cr-Fe alloy with Nb, Mo, Ti, and Al additions
Ø High strength and creep resistance up to 700°C (1300°F)
Ø Good resistance to post-weld strain-age cracking when properly processed
Ø Suitable for service in oxidizing and reducing environments at elevated temperatures
Ø Smooth arc, low spatter, and excellent feedability for TIG/MIG welding
| Category | Details |
| Base Materials | Inconel® 718 (UNS N07718), other precipitation-hardening nickel alloys, and dissimilar joints with stainless steels or high-strength steels |
| Industrial Applications | Gas turbine engines (discs, blades, casings), rocket motor components, high-temperature fasteners and springs, nuclear reactors, extrusion tooling, downhole hardware |
| Service Environment | High temperature (up to ~700°C), thermal cycling, high stress, oxidizing and reducing atmospheres |
| Welding Process | TIG (GTAW), MIG (GMAW) |
| Shielding Gas | Argon (TIG); Ar/He mixtures (MIG) |
| Available Form | Bare wire, spool wire, TIG cut lengths |
Diameter options:
Packaging:
Custom packaging available upon request.
Ø Reliable production quality meeting AWS A5.14 requirements
Ø Traceable heat control for precipitation-hardening filler metals
Ø Clean wire surface for smooth feeding and stable arc
Ø Global export experience with on-time delivery
Ø Technical support for heat treatment and welding procedure qualification
1. What is ERNiFeCr-2 welding wire used for?
It is primarily used for welding Inconel® 718 and other precipitation-hardening nickel-chromium-iron alloys requiring high strength at elevated temperatures.
2. Does ERNiFeCr-2 require post-weld heat treatment?
Yes. To achieve full mechanical properties, especially tensile strength above 1100 MPa, a two-step aging heat treatment is required after welding.
3. Can ERNiFeCr-2 be used for corrosion resistance?
While it offers good oxidation resistance at high temperatures, ERNiFeCr-2 is not primarily a wet-corrosion resistant alloy. For strong acid or chloride service, consider ERNiFeCr-1 or ERNiCrMo-3.
4. Which welding processes are recommended?
TIG (GTAW) and MIG (GMAW) are both suitable. Proper shielding gas (argon or argon-helium mixtures) is required.
Contact our technical team for alloy selection support, product datasheets or a customized quotation for your project.
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