AWS Class ENiCrCoMo-1 Welding Electrodes
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AWS A5.11 ENiCrCoMo-1 Welding Electrode Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001-certified supplier of speciality nickel alloy welding consumables based in Mumbai, India. We provide these electrodes manufactured in accordance with AWS A5.11 / ASME SFA 5.11 (UNS W86117).
ENiCrCoMo-1 is a cobalt-strengthened nickel alloy coated electrode. The weld deposit of ENiCrCoMo-1 carries a nominal balance of 52% Ni, 22-23% Cr, 12% Co, 9% Mo, and ≤5% Fe, with 0.05-0.15% carbon for carbide strengthening at extreme temperatures. The cobalt addition is the single feature that separates ENiCrCoMo-1 from every other electrode. At roughly 12%, cobalt stabilises the austenite matrix above 900°C, giving the weld deposit exceptional creep-rupture strength in the 820-1150°C (1500-2100°F) service range. Minimum tensile strength reaches 620 MPa (90 ksi), with typical mill values closer to 758 MPa (110 ksi). Yield strength sits at roughly 603 MPa (87.5 ksi), and elongation exceeds 25% in the as-welded condition. The electrode runs on DCEP polarity in all positions up to 3.2 mm diameter, with a basic low-hydrogen flux coating for crack-free deposits. Common trade names for this electrode include INCONEL Welding Electrode 117, HAYNES 117, and Nimrod 617KS. Buyers looking for high-temperature SMAW electrodes can get ENiCrCoMo-1 from our ready stock. All batches are tested and supplied with EN 10204/3.1B mill test certificates and full lot traceability.
ENiCrCoMo-1 is the specified filler for welding Alloy 617 (N06617), Inconel 600/601, Incoloy 800H/800HT/803, and dissimilar joints to HK-40, HP, and HP-45 cast alloys. Major applications in industries span gas turbine hot sections, petrochemical reformer tubes, advanced power generation superheaters, heat treatment furnace hardware, and aerospace afterburner liners. Electrode diameters range from 2.4 mm (3/32″) to 4.8 mm (3/16″), supplied in hermetically sealed cans of 2.27 kg (5 lb) and 4.54 kg (10 lb).
ENiCrCoMo-1 Stick Electrode Specifications
Below are ENiCrCoMo-1 electrode details, including size options, usable current polarity, physical dimensions, and available packaging formats.
| AWS Classification | ENiCrCoMo-1 |
|---|---|
| ASME SFA Specification | SFA 5.11 |
| UNS Number | W86117 |
| Base Alloy Match | Inconel 617 / Alloy 617 (UNS N06617) |
| Welding Process | SMAW (Shielded Metal Arc Welding) |
| Electrode Coating Type | Basic / Low-hydrogen |
| Polarity | DCEP (DC Electrode Positive) |
| Welding Positions | All positions ≤3.2 mm; Flat and Horizontal ≥4.0 mm |
| Available Diameters | 2.4 mm (3/32″), 3.2 mm (1/8″), 4.0 mm (5/32″), 4.8 mm (3/16″) |
| Electrode Length | 254 mm (10″) for 2.4 mm; 356 mm (14″) for 3.2-4.8 mm |
| Deposition Efficiency | ~65% (whole electrode); ~105% recovery (core wire) |
| ASME Section IX F-Number | F-43 |
| ASME Section IX A-Number | A-12 |
| Hydrogen Designation | Low-hydrogen basic coating (H4 class typical) |
| Density of Weld Deposit | 8.36 g/cm³ (0.302 lb/in³) |
| Melting Range | 1332-1380°C (2430-2510°F) |
Understanding the ENiCrCoMo-1 AWS Classification Designation
AWS uses a structured alphanumeric code to communicate deposit chemistry at a glance.
| AWS Code Element | Meaning | Key Role |
|---|---|---|
| E | Flux-coated electrode | Used for the SMAW welding process |
| Ni | Nickel-based weld metal (~52% Ni) | Provides corrosion resistance and ductility |
| Cr | 21–26% Chromium | Improves high-temperature oxidation resistance |
| Co | 9–15% Cobalt | Increases high-temperature strength and creep resistance |
| Mo | 8.0–10.0% Molybdenum | Enhances resistance to reducing environments |
| –1 | Composition variant | First Ni-Cr-Co-Mo alloy variant in the classification |
The matching GTAW/GMAW filler wire is ERNiCrCoMo-1 per AWS A5.14, where “ER” (Electrode/Rod) replaces “E” for bare filler applications.
ENiCrCoMo-1 Weld Deposit Chemical Composition
These values show deposited weld metal chemistry, not core wire or Alloy 617 base metal, altered by flux and dilution:
| Element | Nickel (Ni) | Chromium (Cr) | Cobalt (Co) | Molybdenum (Mo) | Iron (Fe) | Manganese (Mn) | Carbon (C) | Silicon (Si) | Copper (Cu) | Niobium + Tantalum (Nb+Ta) | Phosphorus (P) | Sulfur (S) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AWS A5.11 Limits | Balance (~52%) | 21.0-26.0% | 9.0-15.0% | 8.0-10.0% | 5.0% max | 0.30-2.50% | 0.05-0.15% | 0.75% max | 0.50% max | 1.0% max | 0.030% max | 0.015% max |
| Typical Deposit | Balance | 21.7-23.0% | 12.0% | 8.7-9.0% | 1.5-2.0% | 0.46-1.5% | 0.06-0.08% | 0.36% | <0.10% | <0.50% | 0.011% | 0.005% |
Cobalt at ~12% stabilises the FCC austenite matrix above 900°C, preventing phase instability that causes cobalt-free alloys to lose load-bearing capacity. The AWS specification requires a higher chromium range (21-26%) than Alloy 617 base metal (20-24%), compensating for absent aluminium while maintaining oxidation resistance. Actual deposit chemistry varies with welding parameters and base metal dilution.
All-Weld-Metal Mechanical Properties of ENiCrCoMo-1
These are properties of the deposited weld metal tested per AWS A5.11 in the as-welded condition with no post-weld heat treatment:
| Property | Tensile Strength | Yield Strength (0.2% Offset) | Elongation (%) | Charpy V-Notch Impact | Hardness |
|---|---|---|---|---|---|
| AWS A5.11 Minimum | 620 MPa (90,000 psi) | Not specified | 25% min | Not required by AWS A5.11 | Not specified |
| Typical Values | 758 MPa (110,000 psi) | 603 MPa (87,500 psi) | 27% | Not applicable | 20-25 HRC as-welded |
Room-temperature values alone do not capture this electrode’s real value. Creep-rupture strength at 820-1150°C far outperforms cobalt-free deposits like ENiCrMo-3 (Alloy 625) and ENiCrMo-4 (C-276), which lose structural capacity above 650°C. The deposit maintains stable austenitic microstructure reinforced by M₆C and M₂₃C₆ carbides, resisting sigma, mu, and Laves phase embrittlement.
Base Metal Compatibility and ASME P-Number Matrix for ENiCrCoMo-1
ENiCrCoMo-1 (F-43, A-12) is qualified to join a range of nickel and nickel-iron-chromium base metals, plus dissimilar joints to heat-resistant cast alloys and high-alloy steels. WPS developers should reference ASME Section IX QW-432 and QW-442.
| Base Metal | UNS | ASME P-No. | Application Context |
|---|---|---|---|
| Alloy 617 | N06617 | P-43/46 | Primary match: gas turbines, reformers |
| Inconel 601 | N06601 | P-43 | Oxidation-resistant parts above 900°C |
| Inconel 600 | N06600 | P-43 | Furnace components, heat treatment fixtures |
| Incoloy 800 | N08800 | P-45 | Heat exchangers, piping |
| Incoloy 800H | N08810 | P-45 | ASME pressure service above 760°C |
| Incoloy 800HT | N08811 | P-45 | Highest creep strength 800H variant |
| Incoloy 803 | N08803 | P-45 | Reformer and pyrolysis tubes |
Dissimilar Metal Joints:
| Joint Combination | Application |
|---|---|
| Alloy 617 to carbon/low-alloy steel | Transition joints in high-temperature piping |
| 800H/800HT to HK-40 cast alloy | Reformer tube-to-header connections |
| 601 to 800HT | Furnace tube hangers to structural supports |
| 617 to 230 | Advanced gas turbine assemblies |
| HP/HP-45 to wrought nickel alloys | Ethylene cracker tube-to-header welds |
ASME Code Case 2671 specifies ENiCrCoMo-1 as the preferred filler for Incoloy 800H/800HT joints above 760°C (1400°F), over ENiCrFe-2 or ENiCrFe-3, because the cobalt-bearing deposit delivers superior creep-rupture strength.
Recommended Welding Parameters for ENiCrCoMo-1 Electrode
The following table lists recommended ENiCrCoMo-1 DCEP welding parameters, detailing suitable current and voltage ranges by electrode diameter.
| Diameter | Voltage (V) | Flat Amps (A) | Vertical/OH Amps (A) |
|---|---|---|---|
| 2.4 mm (3/32″) | 24-28 | 70-85 | 65-75 |
| 3.2 mm (1/8″) | 26-30 | 85-110 | 80-90 |
| 4.0 mm (5/32″) | 28-32 | 110-140 | 100-120 |
| 4.8 mm (3/16″) | 28-32 | 120-160 | 110-130 |
AC polarity delivers the lowest heat input for thin castings and crack-sensitive repairs. DCEP (DC+) gives deeper penetration for fill and cap passes on heavier sections. Thin sections under 12 mm need no preheat. Medium sections (12-25 mm) need 95-175°C (200-350°F). Heavy sections above 25 mm call for 175-300°C (350-570°F). Keep interpass temperature below 175°C (350°F).
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High-Temperature Industrial Applications of ENiCrCoMo-1 Welding Rod
ENiCrCoMo-1 is used where welds must endure 820–1150°C under load in oxidising/carburising environments across five high-temperature industries.
- Gas Turbine and Aerospace Hot-Section Components: ENiCrCoMo-1 welds are used in combustion liners, transition ducts, flame holders, and afterburner liners in industrial and aero-derivative gas turbines, where 900-1100°C cyclic service demands high creep resistance in nozzle guide vanes and shrouds.
- Power Generation: In USC and A-USC boilers, ENiCrCoMo-1 is the SMAW electrode for Alloy 617 pressure parts at 700-760°C and for Gen IV VHTR intermediate heat exchangers.
- Petrochemical Processing: The electrode joins SMR tube-to-header welds, ethylene furnace tube hangers, and syngas internals at 850-1050°C, including dissimilar HP/HP-45 to Incoloy 800H/800HT joints.
- Heat Treatment and Thermal Processing Equipment: Furnace muffles, retorts, radiant tubes, rollers, and fixtures above 900°C use ENiCrCoMo-1 to resist oxidation and carburisation in controlled atmospheres.
- Chemical Processing: It serves catalyst grids in ammonia burners, hot reactor internals, flare tips, and waste-heat systems needing combined high-temperature oxidation and aqueous corrosion resistance.
Storage, Handling and Re-Drying Procedures for ENiCrCoMo-1 Electrodes
Store ENiCrCoMo-1 electrodes in original hermetically sealed containers at ≥15°C (60°F) and relative humidity below 50%. Shelf life is unlimited while cans remain sealed. Once opened, use electrodes within 8 hours or transfer them to a heated holding oven maintained at 125-175°C (250-350°F).
If electrodes absorb moisture, re-dry at 200-300°C (390-570°F) for 1-2 hours. A maximum of 2 re-drying cycles is permitted; beyond that, discard the electrodes. Excessive moisture raises the risk of porosity and hydrogen cracking. Use portable rod ovens (65-95°C / 150-200°F) at the welding station. Nicorex Alloys supplies ENiCrCoMo-1 in hermetically sealed ring-pull cans.
How to Order ENiCrCoMo-1 Welding Electrodes from Nicorex Alloys
To order ENiCrCoMo-1 electrodes, provide the following 7 details for an accurate quotation:
- AWS Classification: ENiCrCoMo-1 per AWS A5.11 / ASME SFA-5.11
- Diameter: 2.4 mm / 3.2 mm / 4.0 mm / 4.8 mm
- Quantity: Specify kg or number of canisters
- Testing / Certification: MTC 3.1/3.2; PMI Report; NACE MR0175; TPI
- Material Grade: Inconel 117; UNS W86117; W.Nr. 2.4627; EN ISO 14172: E Ni 6617
- Packaging & Cert Scope: 2.4 mm: 8 lb cans / 3.2–4.8 mm: 10 lb hermetic cans; vacuum-packed option — specify
- Applicable Code: ASME VIII, IX, B31.3 — specif
- Delivery: Domestic — specify delivery address
Ask about matching ERNiCrCoMo-1 TIG/MIG wire to complete the consumable set for your WPS.
Frequently Asked Questions
What is the maximum continuous service temperature for welds made with ENiCrCoMo-1 Electrode?
ENiCrCoMo-1 welds provide optimum strength and oxidation resistance up to about 1150°C (2100°F), with ~12% cobalt maintaining creep resistance from 820-1150°C, whereas ENiCrMo-3 (Alloy 625) is generally limited to around 650°C for structural high-temperature service.
Can ENiCrCoMo-1 Electrode be used for Welding Incoloy 800HT in Service above 760°C?
Yes, ENiCrCoMo-1 is recommended by ASME code cases and manufacturers as the preferred filler for 800H/800HT joints above 760°C (1400°F) because its cobalt-bearing weld metal offers superior creep-rupture strength compared with ENiCrFe-2.
What is the difference between ENiCrCoMo-1 Electrode and ERNiCrCoMo-1 Filler Wire?
ENiCrCoMo-1 is a basic-coated SMAW stick electrode (AWS A5.11), while ERNiCrCoMo-1 is a bare GTAW/GMAW wire (AWS A5.14), but both deposit similar Ni-Cr-Co-Mo Alloy 617-type weld metal and share F-Number F-43.
When not to use ENiCrCoMo-1 Welding Electrode?
Do not use ENiCrCoMo-1 for aqueous corrosion below ~400°C, NACE MR0175 sour service, cryogenic temperatures (≤−96°C), or cobalt-restricted nuclear applications; instead, select ENiCrMo-3, ENiCrMo-4, ENiCrFe-3, or ENiCrFe-7 as applicable.