Nickel Alloy ENiCu-7
UNS W84190
ENiCu-7 is a nickel-copper covered electrode (W84190, Monel Filler Metal 60) for shielded metal arc welding of Monel 400 and other Ni-Cu alloys.
Reference datasheet — ENiCu-7 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the AW condition
ENiCu-7 tempers and conditions
ENiCu-7 is supplied in 2 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Stress relieved | Pick when the weldment gets a stress-relief or a code-mandated PWHT with attached carbon-steel components; strength drops slightly, ductility rises. | 250 | 500 | 40 | 150 HB | 3.5 % IACS |
AWDefault As-welded deposit | Standard condition: use as-welded properties for Monel 400 joints and Ni-Cu overlays; no post-weld heat treatment required. | 290 | 520 | 35 | 165 HB | 3.4 % IACS |
What is ENiCu-7?
ENiCu-7 is a nickel-copper covered electrode (W84190, Monel Filler Metal 60) for shielded metal arc welding of Monel 400 and other Ni-Cu alloys. It is specified when the weld must match base-metal corrosion resistance in seawater, brine and dilute acid service; as-welded deposits run about 290 MPa yield, 520 MPa tensile, 35% elongation and 165 HB (84 HRB). Supply is limited to flux-covered stick electrodes, service is capped near 480 °C, and the deposit is highly sulfur- and lead-sensitive, so joint surfaces must be spotless. For GTAW or GMAW of the same base metals, the bare ERNiCu-7 wire is the direct counterpart. ENiCu-7 has a density of 8.83 g/cm³ (0.319 lb/in³), heavier than 82% of nickel alloy grades. It melts at 1,300°C (2,372 °F). ENiCu-7 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 81% of nickel alloy grades. Elongation at break is 35% and the elastic modulus is 179 GPa (26 Msi).
What is ENiCu-7 used for?
- Monel 400 pressure vessels
- seawater piping repair
- chemical processing equipment
- dissimilar Monel-to-steel joints
Advantages
- Conducts heat well — 21.8 W/m·K (12.6 BTU/hr·ft·°F), better than 90% of nickel alloy grades
- High electrical conductivity — 3.4 % IACS, better than 90% of nickel alloy grades
- Easy to machine — 30/100, better than 90% of nickel alloy grades
- Low embodied carbon — 10.5 kg CO₂/kg, better than 88% of nickel alloy grades
Limitations
- Low stiffness — 179 GPa (26 Msi), worse than 88% of nickel alloy grades
- Hard to polish — 60/100, worse than 84% of nickel alloy grades
- Limited service temperature — 480°C (896 °F), worse than 82% of nickel alloy grades
- Low strength — 290 MPa (42.1 ksi), worse than 81% of nickel alloy grades
ENiCu-7 properties
Typical room-temperature values for ENiCu-7-AW; bars are the position among nickel alloy grades.
Physical3
ENiCu-7 has a density of 8.83 g/cm³ (0.319 lb/in³), heavier than 82% of nickel alloy grades. It melts at 1,300°C (2,372 °F).
Mechanical14
ENiCu-7 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 81% of nickel alloy grades. Elongation at break is 35% and the elastic modulus is 179 GPa (26 Msi).
Thermal6
ENiCu-7 is rated for continuous service to 480°C (896 °F). It conducts heat at 21.8 W/m·K (12.6 BTU/hr·ft·°F), better than 90% of nickel alloy grades. Thermal expansion is 13.9 µm/m·K (7.72 µin/in·°F).
Electrical3
ENiCu-7 conducts electricity at 3.4 % IACS, better than 90% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 51% of nickel alloy grades.
Sustainability4
Producing a kilogram of ENiCu-7 takes about 125 MJ of energy and emits 10.5 kg of CO₂ — less than 89% of nickel alloy grades. Typical recycled content is 30%.
Manufacturability7
ENiCu-7's machinability is poor (30/100, better than 90% of nickel alloy grades); weldability very good (72/100); formability fair (35/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. ENiCu-7 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ENiCu-7
Is ENiCu-7 easy to machine?
Deposits machine like Monel 400 — gummy and work-hardening; use sharp positive-rake carbide, heavy feed, low speed, flood coolant.
Can ENiCu-7 be welded?
SMAW with DCEP, stringer beads, low heat input and minimal weaving; joints must be free of sulfur, lead, grease and paint to avoid hot cracking; redry electrodes ~150–200 °C before use.
Can ENiCu-7 be formed, bent or molded?
Not a wrought product; deposit itself is ductile and can be peened or lightly dressed, and overlays tolerate cold flattening of the base plate.
ENiCu-7 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Niincludes incidental Co | 62 – 69 | 66 |
| Mn | ≤ 4 | 2.5 |
| Fe | ≤ 2.5 | 1.2 |
| Tideoxidizer | ≤ 1 | 0.4 |
| Si | ≤ 1.5 | 0.7 |
| Al | ≤ 0.75 | 0.2 |
| C | ≤ 0.15 | 0.05 |
| S | ≤ 0.03 | 0.01 |
| P | ≤ 0.02 | 0.01 |
| Pb | ≤ 0.02 | |
| Other (total) | ≤ 0.5 | |
| Curemainder, nominally ~28–30 % | balance |
What surface finishes work on ENiCu-7?
Grind or wire-brush with stainless/nickel tools only, then pickle or passivate; not anodizable, takes electropolish and mechanical polish well.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy ENiCu-7 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- W84190
- Also called
- AWS A5.11 ENiCu-7
How much does ENiCu-7 cost?
ENiCu-7 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
ENiCu-7 — frequently asked
What is ENiCu-7 used for?
ENiCu-7 is typically used for monel 400 pressure vessels, seawater piping repair, chemical processing equipment and dissimilar Monel-to-steel joints. In short: matches Monel 400 corrosion; field-friendly SMAW electrode; seawater-service weld deposit.
What is the yield strength of ENiCu-7?
ENiCu-7 has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 81% of nickel alloy grades. Strength varies by condition: see the 2 listed tempers.
Is ENiCu-7 easy to machine?
Not especially — machinability is rated poor (30/100, better than 90% of nickel alloy grades). Deposits machine like Monel 400 — gummy and work-hardening; use sharp positive-rake carbide, heavy feed, low speed, flood coolant.
Can ENiCu-7 be welded?
Yes — weldability is rated very good (72/100). SMAW with DCEP, stringer beads, low heat input and minimal weaving; joints must be free of sulfur, lead, grease and paint to avoid hot cracking; redry electrodes ~150–200 °C before use.
What surface finishes work on ENiCu-7?
Grind or wire-brush with stainless/nickel tools only, then pickle or passivate; not anodizable, takes electropolish and mechanical polish well.
Can ENiCu-7 be formed, bent or molded?
Not a wrought product; deposit itself is ductile and can be peened or lightly dressed, and overlays tolerate cold flattening of the base plate.
What is the maximum service temperature of ENiCu-7?
ENiCu-7 is rated for continuous use to about 480°C (896 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ENiCu-7-AW and ENiCu-7-SR?
AW is the default condition — standard condition: use as-welded properties for Monel 400 joints and Ni-Cu overlays; no post-weld heat treatment required. SR: pick when the weldment gets a stress-relief or a code-mandated PWHT with attached carbon-steel components; strength drops slightly, ductility rises. Yield strength is 290 MPa in AW versus 250 MPa in SR.
How much does ENiCu-7 cost?
ENiCu-7 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- AWS A5.11/A5.11M — Nickel and Nickel-Alloy Covered Welding Electrodes — American Welding Society (2018)
- UNS W84190 — Metals and Alloys in the Unified Numbering System — SAE/ASTM (2017)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
- Nickel-copper covered electrode (Monel-60 type) all-weld-metal data — Special Metals / Böhler Welding (2022)
- Ni307/ENiCu-7 (2026)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.