Nickel Alloy ERNiMo-7
UNS N10665 · ISO S Ni 10665
ERNiMo-7 is a low-carbon, chromium-free Ni-Mo filler wire (UNS N10665) for welding Hastelloy B-2 and B-3 in hydrochloric and sulfuric acid service.
Reference datasheet — ERNiMo-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
ERNiMo-7 tempers and conditions
ERNiMo-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 |
|---|---|---|---|---|---|---|
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 |
AWDefault 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 |
Supply forms, finishes and certifications
Ways ERNiMo-7 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
WIRE | Bare filler wire / cut length as supplied | Supply form |
What is ERNiMo-7?
ERNiMo-7 is a low-carbon, chromium-free Ni-Mo filler wire (UNS N10665) for welding Hastelloy B-2 and B-3 in hydrochloric and sulfuric acid service. Supplied as drawn wire for GTAW and GMAW, its deposits run about 470 MPa yield, 780 MPa tensile, 35 % elongation and 92 HRB, with service to 400 °C. Without chromium, resistance to oxidizing media and ferric or cupric contamination is limited (corrosion rating 84), and stress relief in the 550–900 °C range must be avoided. For mixed oxidizing-reducing acids, use a Ni-Cr-Mo filler such as ERNiCrMo-13. ERNiMo-7 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). ERNiMo-7 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).
What is ERNiMo-7 used for?
- hydrochloric acid processing
- sulfuric acid equipment
- pharmaceutical reactor fabrication
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 properties
Typical room-temperature values for ERNiMo-7-AW; bars are the position among nickel alloy grades.
Physical3
ERNiMo-7 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 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 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 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 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'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. 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. ERNiMo-7 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ERNiMo-7
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.
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 |
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.
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 ERNiMo-7 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N10665
- ISO
- S Ni 10665
How much does ERNiMo-7 cost?
ERNiMo-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.
ERNiMo-7 — frequently asked
What is ERNiMo-7 used for?
ERNiMo-7 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?
ERNiMo-7 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 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 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?
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 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?
ERNiMo-7 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.
How much does ERNiMo-7 cost?
ERNiMo-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 A5.14/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; 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.