Hastelloy® X

Chemistry*

Typical Inventory

Round Bar, Plate, Strip

Applications

Alloy X is recommended especially for use in furnace applications because it has unusual resistance to oxidizing, reducing, and neutral atmospheres. Furnace rolls made of this alloy were still in good condition after operating for 8700 hours at 2150 °F. Furnace trays, used to support heavy loads, have been exposed to temperatures up to 2300 °F. in an oxidizing atmosphere without bending or warping. Alloy X is also used for retorts, muffles, catalyst support grids, furnace baffles, tubing for pyrolysis operations and flash drier components.

Alloy X has wide use in gas turbine engines for combustion zone components such as transition duct, combustor cans, spray bars, and flame holders, as well as in afterburners, tailpipes, and cabin heaters.

General Data

Alloy X is one of the most widely used nickel base superalloys for gas turbine engine components. This solid solution strengthened grade has good strength and excellent oxidation resistance to 2000 °F. Alloy X has excellent resistance to reducing and carburizing atmospheres making it suitable for furnace components. Due to its high molybdenum content, Alloy X may be subject to catastrophic oxidation at 2200 °F.

• Good high temperature strength.
• Oxidation resistance through 2000 °F.
• Carburization resistant.

Mechanical Properties

The typical properties listed can usually be provided in rounds, sheet, strip, plate, & custom forgings. We have the equipment to produce small quantities in special sizes to meet our customers’ specific needs. The table below shows Haynes' Nominal Room-Temperature Mechanical Properties of Alloy X Plate and Sheet. For most common forms and exceptions, check out the datasheet linked underneath the table.

UTS = Ultimate Tensile Strength, YS = Yield Strength

Common Specifications

Note that the specifications listed are common for this alloy but are for reference only and may be specific to a certain form. The specifications listed are not comprehensive nor indicative of any edition, revision, or similar such as an amendment. Please, reach out to our sales department to request the Material Test Report (MTR) or to confirm your required specifications.

Physical Properties

* 70 °F to indicated temperature.

Machining

Nickel and cobalt based alloys can be difficult to machinine. However, it should be emphasized that these alloys can be machined using conventional production methods at satisfactory rates. These alloys harden rapidly, generate high heat during cutting, weld to the cutting tool surface and offer high resistance to metal removal because of their high shear strengths. The following are key points which should be considered during machining operations:

• CAPACITY - Machine should be rigid and overpowered as much as possible.
• RIGIDITY - Work piece and tool should be held rigid. Minimize tool overhang.
• TOOL SHARPNESS - Make sure tools are sharp at all times. Change to sharpened tools at regular intervals rather than out of necessity. A 0.015 inch wear land is considered a dull tool.
• TOOLS - Use positive rake angle tools for most machining operations. Negative rake angle tools can be considered for intermittent cuts and heavy stock removal. Carbide-tipped tools are suggested for most applications. High speed tools can be used, with lower production rates, and are often recommended for intermittent cuts.
• POSITIVE CUTS - Use heavy, constant, feeds to maintain positive cutting action. If feed slows and the tool dwells in the cut, work hardening occurs, tool life deteriorates and close tolerances are impossible.
• LUBRICATION - lubricants are desirable. Soluble oils are recommended especially when using carbide tooling.

Terms and Conditions

References

Hastelloy® is a registered trademark of Haynes International Inc.

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