AMS 5598 / Inconel X750 Nickel Alloy Strip
Product Introduction
When the X-750 is made into a "strip" shape, its application scenarios and core requirements undergo a qualitative change. We must focus on "thinness" and "precision forming." It also possesses the perfect balance of "memory" and "anti-relaxation," "rigidity" and "flexibility," and "heat resistance" and "environmental resistance," making it the best material for aero-engines.
The nickel alloy strips we supply strictly adhere to the AMS 5598 standard. The essence of this standard lies in its strict requirements not only on chemical composition and mechanical properties, but also on rolling processes, heat treatment regimes, surface finish, and non-destructive testing, ensuring a high degree of consistency and predictability in material properties-the foundation for your automated, high-volume precision forming operations.
Our recommended procurement specifications are as follows: When requesting a quote, please ensure you specify the following information: 'Inconel X-750, UNS N07750, conforming to AMS 5598 Rev. F (latest version), Condition A (solution state), thickness 0.20mm ±0.01mm, width 50.0mm ±0.1mm, surface finish bright annealed (BA) or specified roughness Ra value, sheet shape requirement: ≤2mm wavy bend per meter.' Ambiguity in any of these aspects could lead to production disasters.
AMS 5598 specification covers a corrosion- and heat-resistant X750 nickel alloy in the form of sheet and strip up to 0.187 inch (4.75 mm) thick, inclusive, and plate up to 4.000 inches (101.6 mm) thick, inclusive.
Inconel X750 is a precipitation-hardenable nickel-chromium alloy used for its corrosion and oxidation resistance and high strength at temperatures to 1300°F. Although much of the effect of precipitation hardening is lost with increasing temperature over 1300°F, heat-treated material has useful strength up to 1800°F.
These products have been used typically for parts requiring high strength up to 1500 °F (816 °C) and oxidation resistance up to 1800 °F (982 °C) and for bellows and flat springs requiring optimum resistance to relaxation up to 1000 °F (538 °C) with moderate or relatively low stresses, particularly where welding is involved, but usage is not limited to such applications. Parts may be formed, welded if required, and then heat-treated to improve strength at elevated temperatures.
Why must it be the AMS 5598 strip, and not others?
vs. Ordinary strip: AMS 5598 has aerospace-grade requirements for surface quality, thickness tolerance, and flatness (straightness). Even a tiny scratch or thickness inconsistency can become a stress concentration point and fatigue crack initiation point when forming thin-walled rings or springs.
vs. Bar machining: Machining thin-walled rings from bar stock results in extremely low material utilization (<10%), skyrocketing costs, and the fiber flow lines are severed, leading to fatigue performance far inferior to parts directly formed from precision strip by stamping or spinning. AMS 5598 strip is a material form "designed for manufacturing."
Chemical Composition
We guarantee that aluminum is around 0.7%, titanium around 2.5%, and the content of carbon, sulfur, phosphorus, and gases (O, N, H) is suppressed to extremely low levels. Even the slightest fluctuation in composition will directly affect the relaxation and fatigue resistance of your final parts.
| 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 |
Processing and Quality Inspection
When customers buy this type of strip, they are buying the success rate of "from coil to qualified parts." Therefore, processing and quality control are crucial.
Key Points in Processing and Heat Treatment (Our Core Value):
"There are three crucial 'devilish details' that determine success or failure, details we've helped countless clients avoid:
- 'Forming must be in the A state! Aging must be after forming!' This is an ironclad rule. If the order is wrong, the material will crack directly.
- Post-forming 'stress relief' and 'aging': After complex forming, it is recommended to first perform 'stress relief annealing' (e.g., 870°C) to eliminate forming stress and prevent deformation or cracking during subsequent aging. Then perform standard two-stage aging (845°C + 705°C).
- Surface protection is vital: The BA surface of the strip is designed to prevent oxidation and facilitate forming. Throughout the entire processing and heat treatment process, a vacuum or protective atmosphere must be used. Any surface oxidation or contamination will become the starting point for fatigue cracks."
Triple Quality Inspection:
"We provide a complete AMS 5598 compliance certificate. We also conduct inspections according to the following procedures, which you can also refer to for these inspection items:
- Incoming material microscopic inspection:" Use a micrometer and sheet metallizer to 100% inspect the thickness, width, and straightness. Use a high-powered microscope to randomly inspect the surface; there should be no scratches, pits, or oxide scale.
- Performance Verification Test Pieces: For each roll of strip, we recommend cutting a long piece and simultaneously forming and aging it. Then send it to a third party for a 'high-temperature stress relaxation test' or a 'room temperature/high-temperature fatigue test'. This is the 'ultimate touchstone' for verifying whether this batch of material meets your design life requirements. We can recommend authoritative laboratories.
- First Piece Comprehensive Dissection: The first batch of parts must undergo metallographic examination to check the grain size and carbide distribution uniformity; perform a 'dimensional stability thermal cycling test' to simulate operating conditions and check for deformation.
Hot Tags: AMS 5598， Inconel X750， Nickel Alloy strip, China inconel alloy manufacturers, factory
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