Inconel X750 Strip （AMS 5598, UNS N07750)
Inconel X750 (UNS N07750, W.Nr. 2.4669, AMS 5598/5542) is a precipitation-hardened, nickel-chromium-based superalloy.
It is a classic example of a "heat-treatable" nickel-based alloy. While Alloy 600 relies on solid-solution strengthening-meaning its hardness and strength are fixed upon delivery-Alloy X750 is precipitation-hardenable; it is supplied in a soft state and aged by the customer, allowing its strength to more than double. For applications such as high-temperature springs, bolts, and seals that require both high strength and corrosion resistance, X750 is a classic choice with a track record spanning decades.
What is Inconel X750 Strip?
Inconel X750 strip (also known as Inconel X750 belt or Inconel X750 strapping) is a narrow,
long-form nickel alloy material with outstanding properties, including:
High-temperature strength (up to 1300°F, with useful performance up to 1800°F)
Superior corrosion & oxidation resistance
Excellent fatigue resistance & flexibility
Precipitation-hardenable for enhanced mechanical properties
Standards and Grades
When discussing Inconel X-750, we typically supply the material grades and standards commonly used by our customers:
- AMS 5598 (Core standard for strip/sheet, thickness ≤ 0.187" (4.75 mm))
- AMS 5542 (standard for strip/sheet; aging treatment differs slightly)
- UNS N07750 (the most common Unified Numbering System designation)
- W.Nr. 2.4669 (German standard number)
Chemical Composition
(UNS N07750 / AMS 5598)
|
Element |
Min % |
Max % |
|
C |
– |
0.08 |
|
Mn |
– |
1.00 |
|
Si |
– |
0.50 |
|
S |
– |
0.01 |
|
Cr |
14.00 |
17.00 |
|
Ni |
70.00 |
– |
|
Nb/Cb |
0.70 |
1.20 |
|
Ti |
2.25 |
2.75 |
|
Al |
0.40 |
1.00 |
|
Fe |
5.00 |
9.00 |
|
Co |
– |
1.00 |
|
Ta |
– |
0.05 |
|
Cu |
– |
0.50 |
Mechanical Properties
(AMS 5598 Strip) - Significant differences depending on the condition
|
Properties |
Tensile Strength (ksi) | Tensile Strength (MPa) | Yield Strength (ksi) | Elongation |
| Solution-annealed condition (Condition A) | ≤130 | ≤896 | - | ≥40% |
| Aged condition (1300°F/20h) | ≥165 | ≥1138 | ≥105 | ≥20% |
| Aged state (Plate) | ≥155 | ≥1069 | ≥100 | ≥20% |
Note: The elongation of Inconel X750 drops from over 40% in the solution-annealed state to approximately 20% in the aged state, indicating that the material becomes harder and more brittle after aging. All complex forming operations must be performed in the solution-annealed state; only finishing operations should be carried out after aging.
Typical Applications
Typical applications for Inconel X-750 strip include:
Aerospace: High-temperature springs, bolts, fasteners, and engine casing seals
Gas turbines: Turbine blades, seal rings, and high-temperature fasteners
Nuclear industry: Reactor internals and pressure vessel fasteners
Chemical/Petrochemical: High-temperature, corrosion-resistant fasteners and valve springs
Automotive: High-temperature exhaust system springs and turbocharger fasteners
Supply specifications and condition
When compiling real-time pricing for Inconel X750 strip, our professional team clarifies the following technical specifications to facilitate a quick and accurate quote:
Dimensions: Thickness (commonly 0.05–4.75 mm) and width
Condition: Solution-annealed (Condition A/soft state, for customer-performed aging) or Aged (finished hard state)
Surface Finish: Bright Annealed (BA), cold-rolled, or pickled
Certification Requirements: AMS 5598/5542 certification required? Intended for aerospace or nuclear power applications?
Guidance on Condition Selection:
- For stamping, bending, or spring winding → Choose Solution-annealed (Condition A); it offers good ductility, allowing for aging treatment after fabrication.
- For direct use of finished parts without in-house heat treatment capabilities → Choose Aged (material already possesses the required design properties).
- This is a common pitfall-the strength difference between the solution-annealed and aged states is substantial (often twofold)-so be sure to verify this during procurement.
The most critical factor when purchasing X750 strip material is verifying its condition. The solution-annealed state is soft-with an elongation of over 40%-making it suitable for stamping; the aged state is hard-with a strength of 1100–1300 MPa-making it ready for direct installation. If you purchase the solution-annealed material and install it directly, the strength will be insufficient, and the spring will deform as soon as it is compressed. Every year, customers fall into this trap.
Email:susan@lorkgroup.com
WhatsApp: +86 199 3707 5488
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