Material Family

Nickel-Chromium-Iron-Molybdenum-Cobalt Solid-Solution Strengthened Superalloy

Designed for high-temperature structural performance rather than aqueous corrosion resistance.

Common Forms (Bar)

Hot Rolled, Forged, or Cold Finished Rounds, Hexagons, Squares. Also as Forging Billet for critical aerospace components.

Available in a wide range of diameters; forged bar offers superior grain flow for demanding applications.

Chemical Composition (Typical wt.%)

Ni: 47.0 (Balance)
Cr: 20.5 - 23.0
Fe: 17.0 - 20.0
Mo: 8.0 - 10.0
Co: 0.5 - 2.5
W: 0.2 - 1.0
C: 0.05 - 0.15

High Cr for oxidation resistance. Mo, Co, and controlled C contribute to solid-solution strength and carbide formation for high-temperature stability.

Mechanical Properties (Annealed, Room Temp)

Tensile Strength (Rm): 655 - 895 MPa
Yield Strength (Rp0.2): 310 - 480 MPa
Elongation (A): 35 - 55%

Retains a high percentage of its room-temperature strength at elevated temperatures.

Physical Properties

Density: 8.22 g/cm³
Melting Range: 1295 - 1385 °C
Max Continuous Service Temp: 1200°C (2200°F) in oxidizing atmospheres.

Exceptional oxidation resistance and thermal stability at the upper end of the temperature spectrum for wrought nickel alloys.

Key Performance Attributes

• Excellent Oxidation Resistance up to 1200°C (2200°F).
• Outstanding High-Temperature (Creep Rupture) Strength.
• Good Fabricability and Weldability in the annealed condition.
• Resistance to Reducing Sulfur-Bearing Atmospheres and Stress-Relaxation.

The alloy offers the best balance of extreme heat capability, strength, and fabricability among high-temperature wrought alloys.

Key Standards (Bar)

ASTM B572 / ASME SB-572 (Rod & Bar), AMS 5758 (Aerospace Bar, Forging Stock), DIN 2.4665

AMS 5758 is a key aerospace procurement standard for forging-quality bar stock.

Common Sizes & Conditions

Diameter/Thickness: 6mm (0.25") up to 300mm (12")+ for hot rolled/forged.
Condition: Hot Rolled, Annealed, or Solution Heat Treated. The annealed condition is standard for machining.

Often supplied as hot-rolled and annealed round bar for general machining, or as forging billet for aerospace parts.

Machinability & Fabrication

Machinability Rating: ~20-25% (difficult). Highly abrasive and work-hardening. Requires rigid setups, positive rake carbide tools, slow speeds, and heavy, constant feeds.
Weldability: Good, using Hastelloy X welding products (e.g., HASTELLOY® X Filler Metal).

Machining is challenging but standard for high-temperature superalloys. All heavy machining should be done in the annealed condition.

Typical Bar Applications

• Aerospace (Primary Market): Turbine blades, vanes, combustion chamber parts, afterburner components, high-temperature bolts and fasteners.
• Industrial Furnaces: Rolls, trays, fixtures, retorts, radiant tube supports, fan shafts.
• Power Generation: Combustion liner components, transition ducts for land-based turbines.
• Heat Treating: High-temperature fixture components.

The dominant bar material for high-temperature, high-strength machined and forged components in jet engines and thermal processing.