Nickel Alloy N12MV
UNS J30012, N10001 · ASTM A494 N12MV
N12MV is the cast Ni-Mo alloy equivalent to the original Hastelloy B (UNS J30012, ASTM A494 N12MV; wrought N10001).
Reference datasheet — N12MV 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 SA condition
N12MV tempers and conditions
N12MV is supplied in 4 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed and quenched | Standard supply condition for corrosion service: ~1100–1180 °C solution anneal, rapid quench to dissolve Ni-Mo carbides/intermetallics. | 350 | 585 | 10 | 15 HRC | 1.3 % IACS |
As-welded deposit | Condition after minor weld repair when re-solution annealing is impractical; HAZ is susceptible to knife-line and intergranular attack in acids. | 350 | 550 | 7 | 210 HB | 1.3 % IACS |
hot isostatically pressed then solution annealed | For pressure-retaining or radiographic-quality castings where microporosity must be closed; slightly higher ductility and toughness. | 355 | 610 | 14 | 15 HRC | 1.3 % IACS |
Spheroidize annealed | Only for non-critical or mechanical (non-acid) service — interdendritic Mo-rich carbides lower ductility and intergranular corrosion resistance. | 360 | 520 | 5 | 220 HB | 1.3 % IACS |
What is N12MV?
N12MV is the cast Ni-Mo alloy equivalent to the original Hastelloy B (UNS J30012, ASTM A494 N12MV; wrought N10001). It is cast into pump housings, valve bodies and piping fittings for hydrochloric acid and other strongly reducing environments, with solution-annealed properties of 350 MPa yield, 585 MPa tensile, 10 % elongation and about 200 HB, and service to 650 °C. The chromium-free chemistry is attacked by oxidizing media such as nitric acid and ferric ions, ductility is low at 10 %, and machinability is rated 15. For mixed oxidizing and reducing acids, use CX2MW (cast C-22) instead. N12MV has a density of 9.24 g/cm³ (0.334 lb/in³), heavier than 99% of nickel alloy grades. It melts at 1,320°C (2,408 °F). N12MV has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 60% of nickel alloy grades. Elongation at break is 10% and the elastic modulus is 216 GPa (31.3 Msi).
What is N12MV used for?
- HCl service pump housings
- chemical reactor valves
- reducing-acid piping fittings
Limitations
- Limited ductility — 10%, worse than 85% of nickel alloy grades
- Limited formability — 10/100, worse than 85% of nickel alloy grades
- Hard to polish — 60/100, worse than 84% of nickel alloy grades
N12MV properties
Typical room-temperature values for N12MV-SA; bars are the position among nickel alloy grades.
Physical3
N12MV has a density of 9.24 g/cm³ (0.334 lb/in³), heavier than 99% of nickel alloy grades. It melts at 1,320°C (2,408 °F).
Mechanical15
N12MV has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 60% of nickel alloy grades. Elongation at break is 10% and the elastic modulus is 216 GPa (31.3 Msi).
Thermal5
N12MV is rated for continuous service to 650°C (1,202 °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
N12MV conducts electricity at 1.3 % IACS, worse than 89% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (82/100), better than 67% of nickel alloy grades.
Sustainability4
Producing a kilogram of N12MV takes about 175 MJ of energy and emits 14 kg of CO₂ — more than 65% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
N12MV's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability fair (40/100); formability not recommended (10/100).
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. N12MV is highlighted; hover a dot for its name, or open the interactive family chart.
Working with N12MV
Is N12MV easy to machine?
Machine slow and heavy: rigid setup, positive-rake carbide, ~15–25 m/min, generous feed and flood coolant to avoid work hardening and glazing.
Can N12MV be welded?
GTAW/SMAW with matching Ni-Mo (ENiMo-1/ERNiMo-2 type) filler, low heat input, no preheat; re-solution anneal and quench after welding for acid service.
Can N12MV be formed, bent or molded?
Sand or investment cast only; wide freezing range demands strong risering, chills and controlled pour to limit shrinkage porosity — not a wrought/formable product.
N12MV 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 – 33 | 29 |
| Fe | 4 – 6 | 5 |
| V | 0.2 – 0.6 | 0.35 |
| C | ≤ 0.12 | 0.08 |
| Cr | ≤ 1 | 0.5 |
| Si | ≤ 1 | 0.6 |
| Mn | ≤ 1 | 0.6 |
| Cu | ≤ 0.5 | |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Ni | balance |
What surface finishes work on N12MV?
Sand blast, grind and pickle in nitric-free (HCl/HF-type) solution — nitric pickling attacks Ni-Mo alloys; electropolish for clean process surfaces, no anodizing.
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 N12MV in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J30012N10001
- ASTM
- A494 N12MV
How much does N12MV cost?
N12MV 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.
N12MV — frequently asked
What is N12MV used for?
N12MV is typically used for HCl service pump housings, chemical reactor valves and reducing-acid piping fittings. In short: best cast alloy for HCl; chromium-free Ni-Mo casting; not for oxidizing acids.
What is the yield strength of N12MV?
N12MV has a typical yield strength of 350 MPa (50.8 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 60% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is N12MV easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% of nickel alloy grades). Machine slow and heavy: rigid setup, positive-rake carbide, ~15–25 m/min, generous feed and flood coolant to avoid work hardening and glazing.
Can N12MV be welded?
With care — weldability is rated fair (40/100). GTAW/SMAW with matching Ni-Mo (ENiMo-1/ERNiMo-2 type) filler, low heat input, no preheat; re-solution anneal and quench after welding for acid service.
What surface finishes work on N12MV?
Sand blast, grind and pickle in nitric-free (HCl/HF-type) solution — nitric pickling attacks Ni-Mo alloys; electropolish for clean process surfaces, no anodizing.
Can N12MV be formed, bent or molded?
Sand or investment cast only; wide freezing range demands strong risering, chills and controlled pour to limit shrinkage porosity — not a wrought/formable product.
What is the maximum service temperature of N12MV?
N12MV 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 N12MV-SA and N12MV-AC?
SA is the default condition — standard supply condition for corrosion service: ~1100–1180 °C solution anneal, rapid quench to dissolve Ni-Mo carbides/intermetallics. AC: only for non-critical or mechanical (non-acid) service — interdendritic Mo-rich carbides lower ductility and intergranular corrosion resistance. Yield strength is 350 MPa in SA versus 360 MPa in AC.
How much does N12MV cost?
N12MV 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
- ASTM A494/A494M — Castings, Nickel and Nickel Alloy — ASTM International (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- Ni-Mo alloy B / B-2 physical and corrosion data — Haynes International (2020)
- UNS N30012 / J30012 alloy record — SAE/ASTM Metals & Alloys in the Unified Numbering System (2017)
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.