Nickel Alloy X-750 | UNS N07750 | 2.4669 | Inconel X-750

Nickel Alloy X-750 | UNS N07750 | 2.4669 | Inconel X-750

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies Nickel Alloy X-750, also known as Inconel X-750, identified as UNS N07750 and Werkstoff 2.4669, in plate, sheet, strip, round bar, rod, wire, and forging forms. Our Alloy X-750 products can be supplied according to ASTM B637 / ASME SB-637 for bar, rod and forgings; AMS 5542 and AMS 5598 for sheet, strip and plate; and AMS 5698 / AMS 5699 for wire products .

Nickel Alloy X-750 is a precipitation-hardenable nickel-chromium alloy, similar to Alloy 600 but made age-hardenable through the addition of aluminum (0.40-1.00%) and titanium (2.25-2.75%) . The alloy is strengthened by precipitation of γ' phase Ni₃(Al,Ti) within the austenitic matrix following controlled thermal processing . It offers high tensile and creep-rupture strength up to approximately 704°C (1,300°F), oxidation resistance to 982°C (1,800°F), and excellent relaxation resistance, making it a preferred material for high-temperature spring and fastener applications . The alloy also maintains excellent properties at cryogenic temperatures and resists chloride stress-corrosion cracking .

Actual properties depend on product form, dimensions, heat-treatment cycle, and the specified standard.

Alloy X-750 derives its high strength from precipitation hardening. Several heat treatment options are available depending on service temperature requirements:

AMS 5667 (Equalizing + Precipitation)

• Equalizing: 1,625°F (885°C) for 24 hours, air cool
• Precipitation: 1,300°F (704°C) for 20 hours, air cool
• Provides high strength and notch rupture ductility for service up to 1,100°F (593°C)

AMS 5668 (Triple Heat Treatment)

• Solution treatment: 2,100°F (1,149°C), air cool
• Stabilization: 1,550°F (843°C) for 24 hours, air cool
• Precipitation: 1,300°F (704°C) for 20 hours, air cool
• Provides maximum creep, relaxation and rupture strength above 1,100°F (593°C)

AMS 5670 / AMS 5671 (Solution + Furnace Cool Precipitation)

• Solution treatment: 1,800°F (982°C), air cool
• Precipitation: 1,350°F (732°C) for 8 hours, furnace cool to 1,150°F (621°C), hold total 18 hours, air cool
• Provides increased tensile properties with reduced heat treatment time, suitable for service up to 1,100°F (593°C)

Alloy X-750 provides excellent corrosion and oxidation resistance up to high temperatures .

Key Corrosion Characteristics:

• Good oxidation resistance up to approximately 982°C (1,800°F)
• Excellent resistance to chloride stress-corrosion cracking
• Good resistance to many oxidizing environments
• Corrosion resistance similar to Alloy 600 in many media
• Resists carburization and high-temperature corrosion
• Excellent relaxation resistance suitable for high-temperature spring applications

Selection Considerations:

• For applications requiring maximum creep-rupture strength above 704°C, consider Alloy 718 or R-41
• While the alloy is oxidation-resistant to 982°C, strength decreases significantly above 704°C
• Precipitation hardening effects diminish with increasing temperature above 704°C
• Final selection must consider the specific medium, temperature, and exposure conditions

• Aerospace: Gas turbine rotor blades, wheels, bolts, structural members; jet engine afterburners; airframe structures
• Rocket Engines: Thrust chambers and hot-air ducting systems
• High-Temperature Springs: Springs, bolts, fasteners (excellent relaxation resistance up to 540-650°C)
• Nuclear: Reactor core components, pressure vessels
• Industrial: Heat-treating fixtures, forming tools, extrusion dies, test machine grips
• Oil and Gas: Downhole tools, valves

Available quality-control services include:

• Heat-number traceability
• Chemical composition verification
• Tensile, yield and elongation testing
• Hardness inspection
• Dimensional and surface inspection
• Positive Material Identification (PMI)
• Ultrasonic testing
• Dye penetrant inspection
• Heat-treatment records
• EN 10204 3.1 material certificate

For an accurate quotation, please provide:

Alloy Grade · Standard · Product Form · Dimensions · Quantity · Heat Treatment · Inspection Requirement · Application · Working Temperature · Destination Port

For high-temperature or corrosive environments, also provide:

Chemical Medium · Temperature · Oxidizing or Reducing Conditions · Service Life Requirements

Procurement Actions

• Request Nickel Alloy X-750 Quote
• Upload Drawing or MTO
• Check Available Stock
• Ask for Alloy Selection Support

1. What is Nickel Alloy X-750?

Nickel Alloy X-750 (UNS N07750), also known as Inconel X-750, is a precipitation-hardenable nickel-chromium alloy with high strength to 704°C, oxidation resistance to 982°C, and excellent relaxation resistance, making it ideal for high-temperature springs and fasteners .

2. What are the UNS and EN numbers for Alloy X-750?

The UNS designation is N07750; the European Werkstoff number is 2.4669; the German equivalent is NiCr15Fe7TiAl .

3. Which standards apply to Alloy X-750 plate and bar?

ASTM B637 / ASME SB-637 applies to bar, rod and forgings; AMS 5542 and AMS 5598 apply to sheet, strip and plate .

4. How does Alloy X-750 achieve its strength?

Alloy X-750 is precipitation-hardenable through additions of aluminum (0.40-1.00%) and titanium (2.25-2.75%). The alloy is strengthened by γ' phase precipitation following controlled heat treatment .

5. What are the typical heat treatment options?

Common heat treatments include AMS 5667 (equalizing + precipitation) for service up to 593°C, AMS 5668 (triple heat treatment) for maximum creep strength above 593°C, and AMS 5670 (solution + furnace cool precipitation) for increased tensile properties .

6. What is the maximum service temperature for Alloy X-750?

For high strength applications, the maximum service temperature is approximately 704°C (1,300°F). For oxidation resistance, the alloy can be used up to 982°C (1,800°F) .

7. What environments does Alloy X-750 resist?

It resists oxidation to 982°C, chloride stress-corrosion cracking, many oxidizing environments, and offers corrosion resistance similar to Alloy 600 in many media .

8. What is the difference between Alloy X-750 and Alloy 718?

Both are precipitation-hardenable nickel alloys. Alloy 718 has higher molybdenum content and is designed for higher strength to 700°C. Alloy X-750 has better relaxation resistance and is preferred for high-temperature spring applications.

9. Can Alloy X-750 be welded?

Yes. Alloy X-750 has good weldability. However, post-weld heat treatment may be required to restore optimal properties. Welding should be performed in the annealed condition using qualified welding procedures .

10. What information is required for a quotation?

Please provide the standard, product form, dimensions, quantity, heat-treatment condition, inspection requirements, application, working temperature and destination port. For high-temperature service, also specify the operating temperature and service life requirements.