Nickel Alloy ENiCrMo-7-AW (As-welded deposit)
Heat-treated state · default condition
UNS W86455
Standard supplied/qualified condition: field SMAW joints and overlays where solution annealing is impossible.
Values for the AW condition
Other ENiCrMo-7 tempers and conditions
ENiCrMo-7 is listed in 3 conditions; see the grade overview at ENiCrMo-7.
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 |
AWDefaultThis page 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-AW?
ENiCrMo-7-AW is ENiCrMo-7 heat treated to AW — standard supplied/qualified condition: field SMAW joints and overlays where solution annealing is impossible. ENiCrMo-7-AW 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). ENiCrMo-7-AW 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).
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-AW properties
Typical room-temperature values for ENiCrMo-7-AW; 22 are specific to this condition. Other listed values are ENiCrMo-7 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
ENiCrMo-7-AW 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-AW 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-AW 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-AW 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-AW 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-AW'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. Confirm any required mill or lot documentation when quoting.
Working with ENiCrMo-7-AW
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.
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.
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 | — |
ENiCrMo-7-AW — frequently asked
What is ENiCrMo-7-AW used for?
ENiCrMo-7-AW 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-AW?
ENiCrMo-7-AW 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-AW 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-AW 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-AW?
Grind/blend crowns, then pickle-passivate or electropolish to restore the chromium-molybdenum oxide film; no anodizing, plating rarely required.
Can ENiCrMo-7-AW 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-AW?
ENiCrMo-7-AW 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.