Nickel Alloy Alloy 242 Aged
Heat-treated state
UNS N10242 · also Hastelloy 242
Aged = sA + Aged
Pick for maximum strength and creep/fatigue capability in 400–815 °C service after all forming and welding are complete.
Values for the Aged condition
Other Alloy 242 tempers and conditions
Alloy 242 is listed in 4 conditions; see the grade overview at Alloy 242.
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 |
AgedThis page 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 Aged?
Alloy 242 Aged is Alloy 242 heat treated to Aged — pick for maximum strength and creep/fatigue capability in 400–815 °C service after all forming and welding are complete. Alloy 242 Aged has a yield strength of 850 MPa (123 ksi) and a tensile strength of 1,210 MPa (175 ksi) — stronger than 89% of nickel alloy grades. Elongation at break is 21% and the elastic modulus is 220 GPa (31.9 Msi). Alloy 242 Aged 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). SA is the default condition FabDigit quotes; Aged is available on request or by drawing note.
Advantages
- High strength — 850 MPa (123 ksi), better than 89% 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
- Limited ductility — 21%, worse than 76% of nickel alloy grades
- Difficult to weld — 35/100, worse than 76% of nickel alloy grades
Alloy 242 Aged properties
Typical room-temperature values for Alloy 242 Aged; 13 are specific to this condition. Other listed values are Alloy 242 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Alloy 242 Aged 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 Aged has a yield strength of 850 MPa (123 ksi) and a tensile strength of 1,210 MPa (175 ksi) — stronger than 89% of nickel alloy grades. Elongation at break is 21% and the elastic modulus is 220 GPa (31.9 Msi).
Thermal5
Alloy 242 Aged 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 Aged 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 Aged 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 Aged's machinability is not recommended (12/100, worse than 86% of nickel alloy grades); weldability fair (35/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Alloy 242 Aged
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.
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.
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 | — |
Alloy 242 Aged — frequently asked
What is Alloy 242 Aged used for?
Alloy 242 Aged 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 Aged?
Alloy 242 Aged has a typical yield strength of 850 MPa (123 ksi) and a tensile strength of 1,210 MPa (175 ksi) — stronger than 89% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is Alloy 242 Aged easy to machine?
Not especially — machinability is rated not recommended (12/100, worse than 86% 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 Aged be welded?
With care — weldability is rated fair (35/100). 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 Aged?
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 Aged 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 Aged?
Alloy 242 Aged 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.