Haynes 242 Alloy Sheet (ASTM B434, UNS N10242)

Haynes 242 (UNS N10242, W.Nr. 2.4642, Alloy 242) is a unique, age-hardenable nickel-based alloy that derives its strength from long-range ordering. ASTM B434 is the core standard for Haynes 242 alloy plate, sheet, and strip.

Most nickel-based alloys rely on the precipitation of the γ' phase for strengthening; however, this process is highly sensitive to temperature fluctuations and typically necessitates a post-weld re-aging treatment. Alloy 242 stands apart: its strengthening mechanism-known as long-range ordering-essentially involves atoms within the matrix aligning themselves into highly ordered arrays during heat treatment, much like soldiers falling into formation during military drill. This ordered structure effectively pins dislocations, thereby significantly boosting the alloy's strength. Moreover, it retains high ductility even after the aging process. Under identical temperature and load conditions, the strength of Alloy 625 may be only half that of Alloy 242; similarly, in sealing ring applications, Alloy 242 can offer a service life exceeding twice that of Alloy 718.

Regarding Resistance to Fluorine-Induced Environmental Corrosion: The "Privileged" Status in Nuclear Fuel Processing and Plastic Extrusion Applications

We have had clients-manufacturers of processing equipment for fluoroelastomers (such as PVDF and PTFE)-who, upon purchasing Alloy 242 from us, revealed that this material is already being extensively utilized for extrusion screws and barrels, where its service life far exceeds that of conventional materials such as C-276 and Alloy 625.

(UNS N10242/Haynes 242 Composition)

Critical Control Point: The molybdenum content of Haynes 242 is 25%, and its carbon content must be controlled at ≤0.03%-this constitutes the chemical prerequisite for the stable realization of its strengthening through "long-range ordering."

(Haynes 242 Strips/Plates < 3 mm in thickness) - The stark contrast between different states constitutes the key data that demonstrates the material's "controllability."

Data Interpretation - The Practical Significance of High Elongation in the Aged State: This indicates that, following the aging treatment, Alloy 242 does not become brittle-unlike certain other high-strength alloys-but instead retains a substantial degree of plastic reserve. If the manufactured part is subject to stress constraints (such as during secondary machining operations), this inherent toughness helps minimize your scrap rate.

Typical applications for Haynes 242 include:

Aerospace Gas Turbines: Seal rings, retaining rings, and fasteners (bolts, self-locking nuts)-this constitutes its core application domain, where the ability to maintain clamping force at high temperatures is essential.

Industrial Gas Turbines: Ducts, casings, and springs.

Rocket Engines: Nozzle components.

Chemical Processing: Equipment for handling high-temperature hydrogen fluoride vapor; processing equipment for fluorinated elastomers (e.g., extrusion screws, barrels, injection molds).

Plastics Processing: Screws, extrusion barrels, screen changer valves, and similar components used in PVDF and PTFE production equipment.

Nuclear Fuel Processing Equipment: Components designed to withstand environments containing fluoride salts.

To meet the material requirements of users in the aforementioned industries-specifically for Alloy 242 or other alloys within the Haynes nickel series-we offer Alloy 242 in a variety of forms: billets, bars, plates, tubes, coils, strips, wires, and precision-machined components. Furthermore, Lork Group provides both stock processing and customized manufacturing services.

We have compiled a list of questions frequently raised by past clients when inquiring about Haynes 242 plates, along with the key technical details required to generate a quick quotation. Take a look-you might find exactly what you're looking for.

• Dimensions: Thickness (0.1–100 mm), Width, Length
• Surface Finish: Hot-rolled (pickled), Cold-rolled (bright annealed), etc.
• Condition: Solution Annealed (Standard delivery condition; offers maximum ductility, suitable for machining and stamping/forming) or Age Hardened?
• Processing Services: Do you require slitting, stamping, welding, or precision cutting to specific dimensions?
• Certification Requirements: Is an EN 10204 3.1 or 3.2 Material Test Certificate (MTC), or ASME certification, required?

Recommendations for Condition Selection:

Requires in-house stamping/forming/welding → Solution Annealed

To be used directly as a finished, high-strength sealing component → Age Hardened

Requires in-house age hardening after welding → Solution Annealed

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Pitfall Warnings

1. Note the upper temperature limit: for prolonged use above 705°C, the material's strength degrades rapidly. If your application involves operating conditions exceeding 900°C, it is recommended to switch to alloys specifically designed for higher temperatures, such as Haynes 214 or 244.
2. Chemical Composition: Focus on verifying that the molybdenum content is ≥ 24–26% and the carbon content is ≤ 0.03%.

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