Understanding the ERNiCrFe-7 AWS Classification
The following table explains the designation elements of ERNiCrFe-7, showing how each abbreviation identifies alloy composition and classification in the AWS system.
| Designation | Meaning |
|---|
| ER | Electrode/Rod – solid filler wire used for wire-feed welding processes |
| Ni | Nickel-base alloy composition |
| Cr | Chromium – provides oxidation and corrosion resistance |
| Fe | Iron – balances the Ni-Cr alloy system |
| -7 | Seventh alloy variant in the NiCrFe family under AWS A5.14 |
ERNiCrFe-7 was developed as a higher-chromium alternative to ERNiCr-3 to match Inconel 690 base metal. The modified grade ERNiCrFe-7A adds niobium to improve resistance to ductility-dip and hot cracking in multi-pass nuclear weldments. Its SMAW counterpart is ENiCrFe-7, commonly marketed as Inconel 152 electrode.
Weld Deposit Chemical Composition — AWS ERNiCrFe-7
The chemical composition of the ERNiCrFe-7 weld deposit is given below, along with the percentage proportion:
| Specification |
Nickel + Cobalt (Ni+Co) |
Chromium (Cr) |
Iron (Fe) |
Titanium (Ti) |
Aluminium (Al) |
Al + Ti |
Niobium + Tantalum (Nb+Ta) |
Carbon (C) |
Manganese (Mn) |
Silicon (Si) |
Phosphorus (P) |
Sulphur (S) |
Copper (Cu) |
Cobalt (Co) |
Molybdenum (Mo) |
| Composition (wt%) |
48.25–65.00 (Remainder) |
28.0–31.5 |
7.0–11.0 |
1.0 max |
1.10 max |
1.5 max |
0.10 max |
0.04 max |
1.0 max |
0.50 max |
0.02 max |
0.015 max |
0.30 max |
0.12 max |
0.50 max |
All-Weld-Metal Mechanical Properties — ERNiCrFe-7 Welding Wire
Mechanical properties of the ERNiCrFe-7 all-weld-metal deposit in the as-welded condition are listed below in the table:
| Specification |
Tensile Strength (min) |
Tensile Strength (typical) |
Yield Strength (typical) |
Elongation (min, 4d gauge) |
Elongation (typical) |
Impact Toughness (RT) |
| Value |
552 MPa (80 ksi) |
620–690 MPa (90–100 ksi) |
350–400 MPa (51–58 ksi) |
30% |
33–40% |
Good (Charpy values well above code minimums) |
Base Metal Compatibility for AWS A5.14 ERNiCrFe-7
The table below lists common base metals welded with ERNiCrFe-7 filler, including their grades, ASME P-Numbers, and typical application notes.
| Base Metal | Grade | ASME No. | Note |
|---|
| Inconel 690 | UNS N06690 | P-43 | Primary similar joint filler; melting range closely matches Alloy 690 |
| Inconel 600 / 601 to steels | UNS N06600 / N06601 | P-43 | Used for dissimilar transition joints |
| Incoloy 800 / 800H to steels | UNS N08800 / N08810 | P-42 | High-temperature dissimilar weld joints |
| Carbon steel to stainless steel | Various | P-1 to P-8 | Transition joints requiring SCC-resistant weld metal |
ERNiCrFe-7 is widely used for Alloy 690 welds and for nuclear-grade dissimilar metal joints where it has largely replaced ERNiCr-3. It is also applied as corrosion-resistant weld overlay on carbon or stainless steel substrates, producing a ~60Ni-30Cr cladding used in reactor internal components.
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Industrial Applications of ERNiCrFe-7 Nickel-Chromium-Iron Wire
ERNiCrFe-7 welding wire is a high-chromium nickel alloy filler metal designed for demanding high-temperature, corrosion-resistant weld applications.
Available Forms & Packaging
ERNiCrFe-7 Welding Wire are available in the following forms, packaging and diameters:
| Form |
Diameter |
Packaging |
| TIG Wire (Straight Lengths) |
0.8 – 3.2 mm |
915 mm and 1000 mm rods |
| MIG Wire (Spools) |
0.8 – 1.6 mm |
D200 and B300 reels |
ASME Section III nuclear-grade packaging is available on request for projects requiring NCA3800 or NB2400 compliance. All packaging is clearly labelled with batch numbers, heat numbers, and AWS classification codes so it can be easily tracked and documented for use in regulated industries.
How to Order AWS A5.14 ERNiCrFe-7 Welding Wire from Nicorex Alloys
To place an order or request a quotation for ERNiCrFe-7 welding wire, provide the following details:
Frequently Asked Questions
