Nickel Alloy ERNiMo-7-AW (As-welded deposit)
Heat-treated state · default condition
UNS N10665 · ISO S Ni 10665
Default condition: properties of the undiluted deposit in the as-welded state, used for most HCl-service fabrication.
Values for the AW condition
Other ERNiMo-7 tempers and conditions
ERNiMo-7 is listed in 2 conditions; see the grade overview at ERNiMo-7.
- SA
- AW
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Weld metal solution annealed ~1065–1080 °C, rapid quench | Pick when the fabrication receives a full solution anneal to redissolve carbides/β-phase and maximise intergranular corrosion resistance. | 400 | 750 | 45 | 172 HB | 1.3 % IACS |
AWDefaultThis page As-welded deposit | Default condition: properties of the undiluted deposit in the as-welded state, used for most HCl-service fabrication. | 470 | 780 | 35 | 13 HRC | 1.3 % IACS |
What is ERNiMo-7-AW?
ERNiMo-7-AW is ERNiMo-7 heat treated to AW — default condition: properties of the undiluted deposit in the as-welded state, used for most HCl-service fabrication. ERNiMo-7-AW has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 68% of nickel alloy grades. Elongation at break is 35% and the elastic modulus is 217 GPa (31.5 Msi). ERNiMo-7-AW has a density of 9.22 g/cm³ (0.333 lb/in³), heavier than 97% of nickel alloy grades. It melts at 1,330°C (2,426 °F).
Limitations
- Low electrical conductivity — 1.3 % IACS, worse than 97% of nickel alloy grades
- Limited service temperature — 400°C (752 °F), worse than 94% of nickel alloy grades
ERNiMo-7-AW properties
Typical room-temperature values for ERNiMo-7-AW; 23 are specific to this condition. Other listed values are ERNiMo-7 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
ERNiMo-7-AW has a density of 9.22 g/cm³ (0.333 lb/in³), heavier than 97% of nickel alloy grades. It melts at 1,330°C (2,426 °F).
Mechanical17
ERNiMo-7-AW has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 68% of nickel alloy grades. Elongation at break is 35% and the elastic modulus is 217 GPa (31.5 Msi).
Thermal5
ERNiMo-7-AW is rated for continuous service to 400°C (752 °F). It conducts heat at 11 W/m·K (6.36 BTU/hr·ft·°F), worse than 60% of nickel alloy grades. Thermal expansion is 10.3 µm/m·K (5.72 µin/in·°F).
Electrical3
ERNiMo-7-AW conducts electricity at 1.3 % IACS, worse than 97% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (84/100), better than 70% of nickel alloy grades.
Sustainability4
Producing a kilogram of ERNiMo-7-AW takes about 165 MJ of energy and emits 14 kg of CO₂ — more than 54% of nickel alloy grades. Typical recycled content is 25%.
Manufacturability6
ERNiMo-7-AW's machinability is poor (16/100, worse than 71% of nickel alloy grades); weldability very good (78/100); formability fair (50/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ERNiMo-7-AW
Is ERNiMo-7 easy to machine?
Deposits machine like a strongly work-hardening Ni alloy — rigid setups, sharp positive-rake carbide, heavy positive feed, low surface speed and flood coolant; avoid dwelling.
Can ERNiMo-7 be welded?
GTAW/GMAW with 100 % Ar (add He for wetting); keep interpass ≤120 °C and heat input low, use stringer beads, no post-weld stress relief in the 550–900 °C range, and solution anneal + rapid quench if service is severe HCl.
Can ERNiMo-7 be formed, bent or molded?
Supplied as drawn wire; redrawing or re-spooling requires intermediate solution anneals because the alloy work-hardens rapidly.
What surface finishes work on ERNiMo-7?
Pickle or mechanically clean the weld surface — heat tint and embedded iron sharply reduce HCl resistance; do not use chloride-bearing or oxidizing pickling pastes that attack Cr-free Ni-Mo.
ERNiMo-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 |
|---|---|---|
| Mo | 26 – 30 | 28 |
| Fe | ≤ 2 | 1 |
| Cressentially Cr-free chemistry | ≤ 1 | 0.5 |
| Co | ≤ 1 | — |
| W | ≤ 1 | — |
| Mn | ≤ 1 | 0.3 |
| Silow Si limits β-phase/knife-line attack | ≤ 0.1 | 0.04 |
| C | ≤ 0.02 | 0.01 |
| Cu | ≤ 0.5 | — |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Other elements, total | ≤ 0.5 | — |
| Nibalance, nominally ~68–70 % | balance | — |
ERNiMo-7-AW — frequently asked
What is ERNiMo-7-AW used for?
ERNiMo-7-AW is typically used for hydrochloric acid processing, sulfuric acid equipment and pharmaceutical reactor fabrication. In short: chromium-free Ni-Mo filler; matched to Hastelloy B-2/B-3; for reducing acid duty.
What is the yield strength of ERNiMo-7-AW?
ERNiMo-7-AW has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 68% of nickel alloy grades. Strength varies by condition: see the 2 listed tempers.
Is ERNiMo-7-AW easy to machine?
Not especially — machinability is rated poor (16/100, worse than 71% of nickel alloy grades). Deposits machine like a strongly work-hardening Ni alloy — rigid setups, sharp positive-rake carbide, heavy positive feed, low surface speed and flood coolant; avoid dwelling.
Can ERNiMo-7-AW be welded?
Yes — weldability is rated very good (78/100). GTAW/GMAW with 100 % Ar (add He for wetting); keep interpass ≤120 °C and heat input low, use stringer beads, no post-weld stress relief in the 550–900 °C range, and solution anneal + rapid quench if service is severe HCl.
What surface finishes work on ERNiMo-7-AW?
Pickle or mechanically clean the weld surface — heat tint and embedded iron sharply reduce HCl resistance; do not use chloride-bearing or oxidizing pickling pastes that attack Cr-free Ni-Mo.
Can ERNiMo-7-AW be formed, bent or molded?
Supplied as drawn wire; redrawing or re-spooling requires intermediate solution anneals because the alloy work-hardens rapidly.
What is the maximum service temperature of ERNiMo-7-AW?
ERNiMo-7-AW is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ERNiMo-7-AW and ERNiMo-7-SA?
AW is the default condition — default condition: properties of the undiluted deposit in the as-welded state, used for most HCl-service fabrication. SA: pick when the fabrication receives a full solution anneal to redissolve carbides/β-phase and maximise intergranular corrosion resistance. Yield strength is 470 MPa in AW versus 400 MPa in SA.
Sources
- AWS A5.14/A5.14M — Nickel and Nickel-Alloy Bare Welding Electrodes and Rods — AWS (2018)
- ASME SFA-5.14 / ASTM B335 (UNS N10665) — ASME/ASTM (2021)
- Hastelloy B-2 / B-3 alloy technical data and welding guidance — Haynes International (2020)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (Ni-alloy consumables) — ASM International (1993)
- ASM Specialty Handbook: Nickel, Cobalt and Their Alloys — ASM International (2000)
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.