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X-750 Alloy (UNS N07750)

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Alloy X-750 (UNS N07750) is a precipitation-hardenable nickel-chromium-iron-base superalloy that is primarily age-strengthened through the formation of a γ′ [Ni₃(Al,Ti,Nb)] phase by additions of aluminum, titanium, and niobium. It exhibits excellent high-temperature strength, creep resistance, and oxidation resistance, while also providing good low-temperature toughness.


Common trade names include Inconel® X-750, Haynes® X-750, Pyromet® X750, and Nickelvac® X750.



· High Strength & Temperature Resistance: Maintains high strength up to 1300°F (704°C); oxidation resistance up to 1800°F (982°C).

· Stress-Relaxation Resistance: Excellent relaxation resistance, ideal for high-temperature springs and bolts.

· Cryogenic Toughness: Exhibits excellent properties and ductility at cryogenic temperatures.

· Corrosion Resistance: Highly resistant to corrosion in various environments.



Chemical Composition

ElementContent
Ni (+Co)70.0 min.
Cr14.0 – 17.0
Fe5.0 – 9.0
Ti2.25 – 2.75
Al0.40 – 1.00
Cb (Nb) + Ta0.70 – 1.20
C0.08 max.
Mn1.00 max.
Si0.50 max.
S0.01 max.
Co1.00 max.
Cu0.50 max.


Physical Properties

PropertyValue
Density0.299 lb/in³ (8.28 g/cm³)
Melting Range2540 – 2600°F (1395 – 1425°C)
Modulus of Elasticity (E)31 × 10⁶ psi (214 GPa) at RT
Electrical Resistivity~122 µΩ·cm (RT)
Thermal Conductivity12.0 W/m·K (RT)
Curie Temperature~ -125°C
Magnetic Permeability1.002
Magnetic AttractionNone


Mechanical Properties

Typical Room-Temperature Properties (Annealed Condition)

PropertyValue
Ultimate Tensile Strength110,000 PSI (~758 MPa)
Yield Strength (0.2% Offset)50,000 PSI (~345 MPa)
Elongation in 2"40%


Typical Room-Temperature Properties (Cold Rolled)

PropertyValue
Ultimate Tensile Strength185,000 PSI
Yield Strength (2% Offset)125,000 PSI
Elongation in 2"10%


Heat Treatment

Sheet and Strip (per AMS 5598)

Typical precipitation hardening treatment: 1350°F (730°C) / 8 hours, furnace cool to 1150°F (620°C) / 10 hours, then air cool. This treatment promotes high strength for applications at temperatures up to about 700°C (1300°F).

Rod, Bar, and Forgings (per AMS 5667)

Common treatment: 1625°F (885°C) / 24 hours, air cool + 1300°F (704°C) / 20 hours, air cool.


Specifications & Certificates

Product FormSpecifications
Sheet, Strip & PlateAMS 5542, AMS 5598, ASTM B637
Bar, Rod & ForgingsAMS 5667, AMS 5668, AMS 5670,
AMS 5671, AMS 5747, ASME SB637
Bare Welding WireAMS 5778, SFA 5.14/A 5.14 (ERNiCrFe-8)
DIN DesignationNo. 2.4669 / NiCr15Fe7TiAl


Aerospace

  • Gas turbine rotor blades, wheels, bolts, and structural parts

  • Jet engine afterburners, thrust reversers, and hot-air ducting systems

  • Airframe and missile structures

Industrial

  • High-temperature springs and bolts

  • Heat-treating fixtures, forming tools, and extrusion dies

  • Pressure membranes and vessels

  • Nuclear reactors and rocket engine thrust chambers

Typical Applications

  • High-temperature springs (aerospace, gas turbine, oil downhole valve springs, nuclear power elastic snap rings / retaining rings)

  • High-temperature fasteners, lockwire / safety wire, spring clips / elastic retaining clips

  • Elastic components for low-temperature / cryogenic service; resistant to hydrogen sulfide (H₂S) corrosive environments

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Danyang Bosheng Alloys Material Factory Limited occupies over 12000 sq meters of manufacturing located in Dangyang city, Jiangsu provenience close to Hu-Ning expressway and railway, about 2hours ride to Shanghai. 

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