Inconel® Alloy X-750
Inconel® Alloy X-750 is a precipitation-hardenable nickel-chromium alloy designed for high-stress service in environments where oxidation and corrosion resistance are as critical as mechanical strength. Similar to Alloy 718 in its base chemistry, X-750 utilizes the addition of Aluminum and Titanium to achieve its hardness through heat treatment. Its most notable characteristic is its exceptional resistance to "relaxation," making it the industry standard for springs and bolts that must maintain their tension at temperatures up to 1300° F (704° C).
At Aries Alloys, we specialize in providing X-750 materials that meet the exact heat-treatment conditions required for your specific application—whether you need the high-ductility annealed state or the maximum-strength aged condition.
Key Performance Advantages
- Relaxation Resistance: Maintains constant spring pressure and bolt load at temperatures where other alloys would undergo permanent deformation.
- Corrosion & Oxidation Immunity: Exceptional resistance to a wide variety of industrial corrosives and high-temperature oxidation in both oxidizing and reducing atmospheres.
- Cryogenic Toughness: Unlike many high-strength metals, X-750 maintains excellent mechanical properties and does not become brittle in sub-zero or cryogenic environments.
- High Creep-Rupture Strength: Engineered to withstand long-term stress at elevated temperatures without failure.
- Versatile Heat Treatment: Can be processed using various aging cycles to prioritize either tensile strength, fatigue life, or rupture resistance.
Technical Insights
The Strengthening Mechanism: The alloy’s strength is a result of the "gamma prime" (gamma) precipitate phase formed during the aging process. By carefully controlling the Titanium (2.25-2.75%) and Aluminum (0.40-1.00%) content, the material can be "tuned" to meet specific industrial requirements.
Mechanical Attributes:
- High fatigue strength and stiffness.
- Excellent resistance to chloride-ion stress corrosion cracking.
- Retains high strength and hardness up to 1500° F (816° C) for short-term exposure.
- Highly fabricable using standard machining and welding techniques in the annealed state.
Primary Industrial Use Cases
Aries Alloys supplies Inconel X-750 for specialized components across high-tech sectors:
- Gas Turbines: Rotor blades, wheels, bolts, and structural members that operate under intense heat and centrifugal force.
- Nuclear Engineering: Fuel-element spacers, springs, and fasteners where high radiation and heat are present.
- Aerospace Propulsion: Thrust reversers, hot-air ducting systems, and engine bellows.
- Automotive Performance: High-temperature valve springs and specialized fasteners for racing engines.
- Industrial Processing: Heat-treating fixtures, forming tools, and extrusion dies.
Available Product Forms at Aries Alloys
We maintain a robust inventory of Alloy X-750 in accordance with ASTM B637 and AMS 5667/5668:
- Round Bars & Rods: Precision-drawn for the manufacturing of high-strength fasteners and shafts.
- Spring Wire: Available in various gauges for the production of high-temperature compression and extension springs.
- Sheets & Plates: For the fabrication of heat shields, ducting, and structural components.
- Custom Forgings: Rings and blocks tailored to your engineering blueprints.