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AWS A5.14 ERNiMo-8 (UNS N10008) Welding Wire Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001/ISO 14001 certified importer, stockist, and supplier of ERNiMo-8 welding wire based in Mumbai, India. We offer nickel-molybdenum filler wire in the form of TIG rod and SAW wire, in accordance with AWS A5.14. This designation sets it apart from other NiCrMo fillers and changes the limits for WPS qualifying.
This NiMo-family filler wire has a nominal composition of 70Ni-19Mo-6Fe-3W-2Cr. ERNiMo-8 contains only ~2% chromium because its design priority is cryogenic toughness. Molybdenum at 19% and tungsten at 3% deliver solid-solution strengthening that keeps the fully austenitic weld deposit tough down to -196°C (-320°F). ERNiMo-8 is a high-performance nickel-molybdenum alloy engineered for superior resistance to pitting, crevice corrosion, and stress-corrosion cracking. This alloy provides exceptional structural integrity in harsh chemical processing, particularly those involving reducing acids and chloride-rich media. Characterised by high thermal stability and excellent weldability, it ensures consistent mechanical properties and reliable performance in critical industrial fabrications and high-demand environments. . Application coverage spans LNG inner-shell welding, cryogenic vessel fabrication, and ethylene plant equipment.
Each and every shipment is supported by mill test certifications that are in line with EN 10204/3.1B, verification from PMI, and full heat-lot traceability. The sizes of the TIG rods that Nicorex Alloys stocks range from 1.6 millimetres to 3.2 millimetres. Additionally, the company offers SAW wire that is paired with agglomerated flux and is appropriate for both horizontal and flat welding positions simultaneously.
ERNiMo-8 Filler Wire Specifications
ERNiMo-8 filler wire specifications cover classification, welding process compatibility, shielding requirements, and dimensional data for both GTAW and SAW applications.
| AWS Classification | ERNiMo-8 |
|---|---|
| ASME Classification | SFA-5.14 ERNiMo-8 |
| Welding Processes | GTAW (TIG), SAW |
| Polarity | DCEN (GTAW); DCEP (SAW) |
| Positions | All positions (including 4G overhead) |
| TIG Rod Diameter | 1.6, 2.0, 2.4, 3.2 mm |
| TIG Rod Length | 1000 mm (standard) |
| Shielding Gas (GTAW) | 100% Argon or Ar + He mixtures |
Understanding the ERNiMo-8 AWS Classification
The ERNiMo-8 designation follows the AWS naming convention for bare nickel-alloy filler metals. Each segment carries a specific meaning:
| Designator | Meaning |
|---|---|
| ER | Electrode or Rod: bare filler form for GTAW and SAW |
| Ni | Nickel is the primary base element |
| Mo | Molybdenum is the principal alloying addition |
| -8 | 8th variant within the NiMo alloy family |
This places ERNiMo-8 in the nickel-molybdenum alloy family, separate from the NiCr, NiCrFe, and NiCrMo families. Within the NiMo group, ERNiMo-1 corresponds to Hastelloy B, and it is designed for cryogenic steel welding rather than corrosion service.
Weld Deposit Chemical Composition of ERNiMo-8
The weld deposit chemical composition of ERNiMo-8, as specified under AWS A5.14, produces a fully austenitic (FCC) nickel matrix that stays inherently tough at cryogenic temperatures.
| Element | Nickel (Ni) | Molybdenum (Mo) | Iron (Fe) | Tungsten (W) | Chromium (Cr) | Manganese (Mn) | Silicon (Si) | Carbon (C) | Phosphorus (P) | Sulphur (S) | Cobalt (Co) | Vanadium (V) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Composition (wt%) | Balance (~69–72) | 18.0 – 21.0 | 5.0 – 7.0 | 2.0 – 4.0 | ~2.0 | ≤1.0 | ≤0.50 | ≤0.10 | ≤0.015 | ≤0.015 | ≤0.12 | ≤0.20 |
Molybdenum at ~19% is the primary strengthening element. When combined with 3% tungsten, it strengthens the material without forming hard particles, which helps maintain flexibility at -196°C. Chromium is at only ~2% because aqueous corrosion resistance isn’t the design goal; cryogenic toughness is. The low carbon limit (≤0.12%) and controlled silicon level (≤0.10%) ensure that the weld deposit does not develop brittle phases that could weaken it at liquid-nitrogen temperatures.
All-Weld-Metal Mechanical Properties of ERNiMo-8
Refer to the table below for the all-weld-metal mechanical properties of ERNiMo-8, including essential tensile strength and elongation metrics.
| Property | Tensile Strength (min) | Yield Strength, 0.2% Offset (min) | Elongation (min) | Charpy V-Notch at -196°C (-320°F) | Lateral Expansion at -196°C |
|---|---|---|---|---|---|
| Value | ≥660 MPa (≥95,700 psi) | ≥360 MPa (≥52,200 psi) | ≥25% | ≥34 J absorbed energy | ≥0.38 mm |
API 620 Appendix Q calculates allowable stress from weld metal strength, not base metal strength. This makes the 660 MPa UTS and 360 MPa yield values critical design inputs for LNG tank engineering. API 620 permits a maximum UTS of 690 MPa and a yield of 400 MPa.
Get ERNiMo-8 Welding Filler Wire at Competitive Prices
Industrial Applications of ERNiMo-8 Welding Filler Wire
ERNiMo-8 filler wire serves three primary cryogenic sectors where 9% nickel steel is the standard plate material.
- ERNiMo-8 (Kobelco PREMIARC TG-S709S) is widely used in LNG tank construction across Japan and Southeast Asia. It is optimized for automatic TIG welding of ASTM A553 Type I steel, including critical shell joints, bottom plates, and dome roof seams.
- ASME Section VIII vessels storing liquid nitrogen, liquid oxygen, and LNG use 9% Ni steel per ASTM A553. ERNiMo-8 delivers matching cryogenic performance at the weld joint.
- Cold boxes, cryogenic columns, and ethylene storage tanks operate at -104°C (-155°F). ERNiMo-8 weld deposits are used for petrochemical cryogenic fabrication because they remain robust throughout this range. Industrial gas plants holding liquid oxygen and argon use 9% Ni steel welded with this filler.
Available Forms & Packaging of ERNiMo-8
| Product Form | Diameter / Specifications | Packaging |
|---|---|---|
| TIG Rods (Manual GTAW) | 1.6, 2.0, 2.4, and 3.2 mm (1000 mm length) | 5 kg (10 lb) Sealed Tubes |
| SAW Wire (Automated) | Paired with Kobelco PF-N3 or PF-N4 Flux | Standard Spools / Coils |
| Drums (Automatic GTAW) | Specialised for LNG tank welding lines | High-capacity Industrial Drums |
How to Order AWS ERNiMo-8 Welding Wire from Nicorex Alloys
To place an order for ERNiMo-8 filler wire, provide the following details:
- AWS classification: ERNiMo-8 per A5.14 / SFA-5.14
- Product form: TIG rod, SAW wire, or SAW wire + flux combination
- Diameter (mm) and quantity (kg or number of packs)
- LNG project specification reference (if applicable)
- Required approvals or third-party inspection (TPI)
- MTC requirement: EN 10204/3.1B
- Delivery destination (domestic or export)
Custom packaging and project-specific documentation are available on request.
Frequently Asked Questions
What is the Difference between ERNiMo-8 and ERNiCrMo-3 (Inconel 625) for 9% Ni Steel?
Both wires can join 9% Ni steel, but they belong to different alloy families. ERNiMo-8 (~70Ni-19Mo-6Fe-3W-2Cr) is a NiMo alloy purpose-built for cryogenic service. ERNiCrMo-3 (~61Ni-22Cr-9Mo-3.5Nb) is a NiCrMo alloy with broader applications.
What 9% Ni Steel Grades Can ERNiMo-8 Weld?
9% Ni steel grades that can be welded with ERNiMo-8, include ASTM A353 (NNT), ASTM A553 Type I (QT), ASTM A553 Type II, ASTM A334 Grade 8 (tubes), and ASTM A333 Grade 8 (pipe).
Does Base Metal Dilution Affect ERNiMo-8 Weld Properties?
Yes. When 9% Ni base metal dilutes into the weld pool, iron content rises, and Ni/Mo concentrations drop. This shift can reduce cryogenic impact values, especially in the root pass. Welding parameters should be controlled to keep dilution low in critical root passes.