Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
Haynes 242 is an age-hardenable nickel-molybdenum-chromium alloy that derives its strength from a long-range-ordering reaction. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
An age-hardenable nickel-molybdenum-chromium alloy, Haynes 242 derives its strength from a unique long-range-ordering reaction upon ageing, which essentially doubles the un-aged strength while preserving excellent ductility. Its tensile and creep strength to about 649–704 °C (1200–1300 °F) are as much as double those of solid-solution-strengthened alloys, yet ductility in the aged condition remains high. The thermal-expansion characteristics are much lower than those of most nickel-base high-temperature alloys, and the alloy has very good oxidation resistance to about 816 °C (1500 °F), excellent low-cycle-fatigue properties, very good thermal stability, and — owing to its high molybdenum content — outstanding resistance to high-temperature fluorine and fluoride environments. It has good forming and welding characteristics in the annealed condition and is used in the solution-annealed-and-aged condition.
Typical applications include gas-turbine seal rings, containment rings, duct segments, casings, fasteners, rocket nozzles, pumps and honeycomb, and chemical-process equipment for high-temperature hydrogen-fluoride vapour and fluoroelastomer processing.
| Property | Value | Unit |
|---|---|---|
| Density | 9.05 | g/cm³ |
| Melting range | 1304–1382 | °C |
| Elastic modulus | 230 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 10.6 | µm/m·°C |
| Thermal conductivity (20 °C) | 9.6 | W/m·K |
| Specific heat (20 °C) | 419 | J/kg·K |
| Structure | Austenitic (FCC) + ordered Ni₂(Mo,Cr) domains | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Base element; ordering matrix |
| Molybdenum | Mo | 24.0 | 26.0 | Long-range ordering; fluoride resistance |
| Chromium | Cr | 7.0 | 9.0 | Oxidation resistance |
| Iron | Fe | — | 2.0 | Residual |
| Cobalt | Co | — | 2.50 | Residual |
| Manganese | Mn | — | 0.80 | Deoxidiser |
| Silicon | Si | — | 0.80 | Residual |
| Aluminium | Al | — | 0.50 | Minor |
| Carbon | C | — | 0.03 | Low; stability |
| Boron | B | — | 0.006 | Grain-boundary strengthening |
Solution-annealed-and-aged condition, typical values for UNS N10242.
| Condition | Property | Value |
|---|---|---|
| Solution annealed & aged | Tensile strength (UTS) | ≥1290 MPa (187 ksi) |
| Solution annealed & aged | 0.2% yield strength | ≥825 MPa (120 ksi) |
| Solution annealed & aged | Elongation at break | ≥25 % |
| Solution annealed & aged | Hardness | RC 35–39 typical |
| — | Elastic modulus | 230 GPa |
Confirm against the mill test report. The aged strength is as much as double that of solid-solution-strengthened alloys, while ductility remains high; strength is useful to about 704 °C.
| Environment | Performance | Notes |
|---|---|---|
| High-temperature fluorine / fluorides | Excellent | High molybdenum content |
| High-temperature HF vapour | Excellent | Chemical-process use |
| Oxidation (to ~816 °C) | Very Good | Chromium-bearing |
| Thermal stability | Excellent | Stable ordered structure |
| Low-cycle fatigue | Excellent | Combined with low expansion |
The high molybdenum content gives outstanding resistance to high-temperature fluorine and fluoride environments and to hydrogen-fluoride vapour, while the chromium provides good oxidation resistance to about 816 °C; the alloy is selected for its combination of high strength, low expansion and fluoride resistance.
An age-hardenable alloy strengthened by a long-range-ordering reaction (ordered Ni₂(Mo,Cr) domains), not by gamma-prime precipitation. Strength is developed by solution annealing followed by ageing.
Solution Treatment Solution anneal at approximately 1100 °C (2012 °F) and rapidly cool. Forming and welding are performed in this annealed condition.
Precipitation Hardening (Ageing) Age at approximately 650 °C (1200 °F) for an extended time (e.g. up to ~100 hours, or per specification) — developing the long-range-ordered Ni₂(Mo,Cr) domains that roughly double the strength while preserving ductility. The hardening is by ordering, not gamma-prime precipitation.
Good weldability in the annealed condition; welded by the gas-tungsten-arc and gas-metal-arc processes, then solution treated and aged to develop properties. Haynes 242 is also used as a modern substitute for alloy W in some ring applications.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | Matching 242 filler |
| GMAW / MIG | Good | Matching filler |
| Post-weld | Required | Solution treat and age |
Weld in the annealed condition with clean surfaces; apply post-weld solution treatment and ageing to develop properties.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Preferred condition | Annealed for forming; finish-machine aged |
| Aged hardness | RC 35–39; carbide tooling, light finishing cuts |
| Coolant | Ample coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Good in annealed condition; age afterward |
| Hot forming | Performed hot; solution treat and age afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Aero gas turbine | Seal rings, containment rings, casings | High strength + low expansion |
| Propulsion | Fasteners, rocket nozzles, ducts | Strength + thermal stability |
| Chemical process | HF-vapour and fluoroelastomer equipment | Fluoride resistance |
| Power generation | Honeycomb, pumps, high-temperature hardware | Strength + fatigue resistance |
| Product Form | ASTM Standard | AMS / ASME |
|---|---|---|
| Plate, sheet and bar | ASTM B564 / B435 | AMS 5889 |
| Seamless pipe and tube | ASTM B622 | ASME SB-622 |
| Welded pipe and tube | ASTM B619 | ASME SB-619 |
| Forgings and fittings | ASTM B564 / B366 | — |
Nickel-molybdenum-chromium age-hardenable alloy. UNS N10242.
| Alloy | Mo % | Cr % | Strengthening | Best Used For |
|---|---|---|---|---|
| Haynes 242 | 24–26 | 7–9 | Ni₂(Mo,Cr) ordering | Age-hardened low-expansion; turbine rings, fasteners, fluoride service |
| Haynes 244 | 22–24 | 7–9 | Ni₂(Mo,Cr) ordering | Upgraded 242; higher strength to 760 °C |
| Hastelloy W | 23–26 | 4–6 | Solid solution | Dissimilar-weld filler (242 replaces in rings) |
| Hastelloy X | 8–10 | 20.5–23 | Solid solution | Gas-turbine combustors, furnace parts |
| Incoloy 909 | — | — | γ′ (Ni₃(Nb,Ti)) | Controlled-expansion turbine hardware |
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