Nickel Alloy ENiCrMo-7
UNS W86455
ENiCrMo-7 is the covered SMAW electrode version of the C-4 Ni-Cr-Mo filler system (UNS W86455), used for manual arc welding where post-weld heat treatment is impractical.
Reference datasheet — ENiCrMo-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
ENiCrMo-7 tempers and conditions
ENiCrMo-7 is supplied in 3 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution Annealed | Pick when shop-fabricated components can be solution annealed after welding for maximum ductility and homogeneity. | 400 | 720 | 45 | 165 HB | 1.4 % IACS |
AWDefault As-welded deposit | Standard supplied/qualified condition: field SMAW joints and overlays where solution annealing is impossible. | 480 | 760 | 38 | 10 HRC | 1.4 % IACS |
Aged / Sensitization-exposed | Reference condition demonstrating C-4's thermal stability: ductility and intergranular corrosion resistance largely retained after sensitizing exposure. | 510 | 780 | 32 | 205 HB | 1.5 % IACS |
What is ENiCrMo-7?
ENiCrMo-7 is the covered SMAW electrode version of the C-4 Ni-Cr-Mo filler system (UNS W86455), used for manual arc welding where post-weld heat treatment is impractical. It suits field repair and shop joining of Ni-Mo-Cr alloys, with as-welded deposits near 480 MPa yield, 760 MPa tensile, 38 % elongation and 90 HRB, and service to 650 °C. Electrodes require dry storage and redrying, slag must be removed fully between passes, and the deposit machines slowly. ERNiCrMo-7 bare wire is preferred where GTAW or GMAW access is available. ENiCrMo-7 has a density of 8.64 g/cm³ (0.312 lb/in³), heavier than 70% of nickel alloy grades. It melts at 1,350°C (2,462 °F). ENiCrMo-7 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 70% of nickel alloy grades. Elongation at break is 38% and the elastic modulus is 211 GPa (30.6 Msi).
What is ENiCrMo-7 used for?
- field repair welding
- corrosive process equipment
- manual arc joining of Ni-Mo-Cr alloys
Advantages
- Good corrosion resistance — 91/100, better than 87% of nickel alloy grades
- Readily welded — 85/100, better than 83% of nickel alloy grades
ENiCrMo-7 properties
Typical room-temperature values for ENiCrMo-7-AW; bars are the position among nickel alloy grades.
Physical3
ENiCrMo-7 has a density of 8.64 g/cm³ (0.312 lb/in³), heavier than 70% of nickel alloy grades. It melts at 1,350°C (2,462 °F).
Mechanical16
ENiCrMo-7 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 70% of nickel alloy grades. Elongation at break is 38% and the elastic modulus is 211 GPa (30.6 Msi).
Thermal5
ENiCrMo-7 is rated for continuous service to 650°C (1,202 °F). It conducts heat at 10.1 W/m·K (5.84 BTU/hr·ft·°F), worse than 84% of nickel alloy grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical3
ENiCrMo-7 conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (91/100), better than 87% of nickel alloy grades.
Sustainability4
Producing a kilogram of ENiCrMo-7 takes about 165 MJ of energy and emits 13.5 kg of CO₂ — more than 54% of nickel alloy grades. Typical recycled content is 25%.
Manufacturability7
ENiCrMo-7's machinability is poor (22/100, better than 64% of nickel alloy grades); weldability excellent (85/100); formability fair (45/100).
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. ENiCrMo-7 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ENiCrMo-7
Is ENiCrMo-7 easy to machine?
Weld deposit machines like C-4 base metal: slow speeds, heavy positive-rake carbide, rigid setup and flood coolant; grind rather than turn thin overlays.
Can ENiCrMo-7 be welded?
DCEP, stringer beads, low heat input, interpass temperature typically below 150 °C; redry electrodes per maker (≈250–300 °C) and remove all slag between passes to avoid slag inclusions.
Can ENiCrMo-7 be formed, bent or molded?
Not a wrought product; joints and overlays are ductile enough for moderate cold straightening but avoid heavy cold work on the deposit.
ENiCrMo-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 |
|---|---|---|
| Clow carbon for thermal stability | ≤ 0.02 | 0.01 |
| Cr | 14 – 18 | 16 |
| Mo | 14 – 17 | 15.5 |
| Fe | ≤ 3 | 1.5 |
| Ticarbide stabilizer | ≤ 0.7 | 0.3 |
| Co | ≤ 2 | 0.5 |
| W | ≤ 0.5 | 0.1 |
| Mn | ≤ 1 | 0.5 |
| Si | ≤ 0.2 | 0.08 |
| Cu | ≤ 0.5 | 0.05 |
| P | ≤ 0.04 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| Nibalance, ~65 % | balance |
What surface finishes work on ENiCrMo-7?
Grind/blend crowns, then pickle-passivate or electropolish to restore the chromium-molybdenum oxide film; no anodizing, plating rarely required.
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 ENiCrMo-7 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- W86455
How much does ENiCrMo-7 cost?
ENiCrMo-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.
ENiCrMo-7 — frequently asked
What is ENiCrMo-7 used for?
ENiCrMo-7 is typically used for field repair welding, corrosive process equipment and manual arc joining of Ni-Mo-Cr alloys. In short: SMAW version of C-4 filler; field-repair electrode; no PWHT required.
What is the yield strength of ENiCrMo-7?
ENiCrMo-7 has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 70% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is ENiCrMo-7 easy to machine?
Not especially — machinability is rated poor (22/100, better than 64% of nickel alloy grades). Weld deposit machines like C-4 base metal: slow speeds, heavy positive-rake carbide, rigid setup and flood coolant; grind rather than turn thin overlays.
Can ENiCrMo-7 be welded?
Yes — weldability is rated excellent (85/100). DCEP, stringer beads, low heat input, interpass temperature typically below 150 °C; redry electrodes per maker (≈250–300 °C) and remove all slag between passes to avoid slag inclusions.
What surface finishes work on ENiCrMo-7?
Grind/blend crowns, then pickle-passivate or electropolish to restore the chromium-molybdenum oxide film; no anodizing, plating rarely required.
Can ENiCrMo-7 be formed, bent or molded?
Not a wrought product; joints and overlays are ductile enough for moderate cold straightening but avoid heavy cold work on the deposit.
What is the maximum service temperature of ENiCrMo-7?
ENiCrMo-7 is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ENiCrMo-7-AW and ENiCrMo-7-SA?
AW is the default condition — standard supplied/qualified condition: field SMAW joints and overlays where solution annealing is impossible. SA: pick when shop-fabricated components can be solution annealed after welding for maximum ductility and homogeneity. Yield strength is 480 MPa in AW versus 400 MPa in SA.
How much does ENiCrMo-7 cost?
ENiCrMo-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 Welding Electrodes for Shielded Metal Arc Welding — AWS (2018)
- ASME BPVC Section II Part C (SFA-5.11) — ASME (2023)
- HASTELLOY C-4 alloy technical data (N06455) — Haynes International (2020)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
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.