Nickel Alloy Alloy 242
UNS N10242 · also Hastelloy 242
Alloy 242 (N10242) is an age-hardenable Ni-Mo-Cr alloy that combines high strength with good ductility and resistance to hydrofluoric acid environments.
Reference datasheet — Alloy 242 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
Alloy 242 tempers and conditions
Alloy 242 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 | Standard supply condition for sheet, plate, bar and tube — softest, most formable and weldable state before ageing. | 375 | 805 | 48 | 215 HB | — |
As-welded deposit | Reference condition for weldment design when the joint is left in the annealed/as-deposited state. | 430 | 790 | 35 | 20 HRC | 1.4 % IACS |
Cold drawn | Use for small-diameter bar, wire and fasteners where higher as-supplied strength and close tolerance are needed without ageing. | 750 | 1,000 | 22 | 30 HRC | 1.4 % IACS |
SA + Aged | Pick for maximum strength and creep/fatigue capability in 400–815 °C service after all forming and welding are complete. | 850 | 1,210 | 21 | 34 HRC | — |
What is Alloy 242?
Alloy 242 (N10242) is an age-hardenable Ni-Mo-Cr alloy that combines high strength with good ductility and resistance to hydrofluoric acid environments. It is used in oil and gas and aerospace hardware and is supplied as bar, sheet, plate, forgings and fasteners at 375 MPa yield, 805 MPa tensile, 48 % elongation and 215 HB (96 HRB) solution-annealed, with service to 815 °C. Weldability rates 60 of 100 — weld in the annealed condition and age afterwards — while machinability (18) and formability (60) are both low. Where strength matters less than corrosion resistance, C-276 or Alloy 22 are simpler picks. Alloy 242 has a density of 9.05 g/cm³ (0.327 lb/in³), heavier than 94% of nickel alloy grades. It melts at 1,320°C (2,408 °F). Alloy 242 has a yield strength of 375 MPa (54.4 ksi) and a tensile strength of 805 MPa (117 ksi) — weaker than 54% of nickel alloy grades. Elongation at break is 48% and the elastic modulus is 217 GPa (31.5 Msi).
What is Alloy 242 used for?
- downhole tools
- hydrofluoric acid alkylation units
- aerospace fasteners
Advantages
- Ductile — tolerates forming and impact — 48%, better than 83% of nickel alloy grades
Limitations
- Poor heat conductor — 9 W/m·K (5.2 BTU/hr·ft·°F), worse than 97% of nickel alloy grades
Alloy 242 properties
Typical room-temperature values for Alloy 242-SA; bars are the position among nickel alloy grades.
Physical3
Alloy 242 has a density of 9.05 g/cm³ (0.327 lb/in³), heavier than 94% of nickel alloy grades. It melts at 1,320°C (2,408 °F).
Mechanical13
Alloy 242 has a yield strength of 375 MPa (54.4 ksi) and a tensile strength of 805 MPa (117 ksi) — weaker than 54% of nickel alloy grades. Elongation at break is 48% and the elastic modulus is 217 GPa (31.5 Msi).
Thermal5
Alloy 242 is rated for continuous service to 815°C (1,499 °F). It conducts heat at 9 W/m·K (5.2 BTU/hr·ft·°F), worse than 97% of nickel alloy grades. Thermal expansion is 11.2 µm/m·K (6.22 µin/in·°F).
Electrical3
Alloy 242 conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 61% of nickel alloy grades.
Sustainability4
Producing a kilogram of Alloy 242 takes about 170 MJ of energy and emits 14 kg of CO₂ — more than 61% of nickel alloy grades. Typical recycled content is 30%.
Manufacturability8
Alloy 242's machinability is poor (18/100, worse than 61% of nickel alloy grades); weldability good (60/100); formability good (60/100).
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. Alloy 242 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Alloy 242
Is Alloy 242 easy to machine?
Machine like C-276/B-3: rigid setup, positive-rake carbide, low speed (15–25 m/min) with heavy positive feed and flood coolant to avoid work hardening; age-hardened stock is markedly harder and best ground or EDM'd.
Can Alloy 242 be welded?
GTAW/GMAW with matching 242 or Hastelloy-type filler, low heat input and interpass <100 °C, no preheat; weld in the solution-annealed condition and age afterwards for full strength.
Can Alloy 242 be formed, bent or molded?
Cold form only in the annealed state — high work-hardening rate demands intermediate anneals near 1065 °C with rapid quench; hot work 1180–950 °C.
Alloy 242 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 | 24 – 26 | 25 |
| Cr | 7 – 9 | 8 |
| Fe | ≤ 2 | 1 |
| Co | ≤ 1 | 0.3 |
| Mn | ≤ 0.8 | 0.3 |
| Si | ≤ 0.8 | 0.2 |
| Al | ≤ 0.5 | 0.2 |
| Cu | ≤ 0.5 | 0.1 |
| C | ≤ 0.03 | 0.01 |
| B | ≤ 0.01 | 0 |
| Nibalance, typically ~62–66 % | balance |
What surface finishes work on Alloy 242?
Not anodizable; pickle/passivate after hot work to remove Mo-rich oxide, then abrasive-blast, electropolish or mechanically polish for a clean corrosion-resistant surface.
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 Alloy 242 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N10242
- Trade names
- Hastelloy 242
How much does Alloy 242 cost?
Alloy 242 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.
Alloy 242 — frequently asked
What is Alloy 242 used for?
Alloy 242 is typically used for downhole tools, hydrofluoric acid alkylation units and aerospace fasteners. In short: age-hardenable Hastelloy grade; HF acid plus high strength; weld annealed, then age.
What is the yield strength of Alloy 242?
Alloy 242 has a typical yield strength of 375 MPa (54.4 ksi) and a tensile strength of 805 MPa (117 ksi) — weaker than 54% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is Alloy 242 easy to machine?
Not especially — machinability is rated poor (18/100, worse than 61% of nickel alloy grades). Machine like C-276/B-3: rigid setup, positive-rake carbide, low speed (15–25 m/min) with heavy positive feed and flood coolant to avoid work hardening; age-hardened stock is markedly harder and best ground or EDM'd.
Can Alloy 242 be welded?
Yes — weldability is rated good (60/100). GTAW/GMAW with matching 242 or Hastelloy-type filler, low heat input and interpass <100 °C, no preheat; weld in the solution-annealed condition and age afterwards for full strength.
What surface finishes work on Alloy 242?
Not anodizable; pickle/passivate after hot work to remove Mo-rich oxide, then abrasive-blast, electropolish or mechanically polish for a clean corrosion-resistant surface.
Can Alloy 242 be formed, bent or molded?
Cold form only in the annealed state — high work-hardening rate demands intermediate anneals near 1065 °C with rapid quench; hot work 1180–950 °C.
What is the maximum service temperature of Alloy 242?
Alloy 242 is rated for continuous use to about 815°C (1,499 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Alloy 242-SA and Alloy 242 Aged?
SA is the default condition — standard supply condition for sheet, plate, bar and tube — softest, most formable and weldable state before ageing. Aged: pick for maximum strength and creep/fatigue capability in 400–815 °C service after all forming and welding are complete. Yield strength is 375 MPa in SA versus 850 MPa in Aged.
How much does Alloy 242 cost?
Alloy 242 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
- HAYNES 242 alloy technical brochure (H-3021) — Haynes International (2020)
- ASTM B622 / B619 / B626 — Ni-Mo-Cr alloy tube and pipe (UNS N10242) — ASTM International (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- AMS 5896 / SAE nickel alloy sheet, strip and plate specifications — SAE International (2019)
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.