X750 Sheet, Coil - AMS 5598, AMS 5542
Inconel Alloy® X‑750 is a precipitation‑hardenable, nickel‑chromium austenitic alloy derived from Alloy 600 and strengthened through the addition of aluminum and titanium. It combines excellent resistance to corrosion and oxidation with high tensile strength and outstanding creep‑rupture properties at elevated temperatures up to approximately 1,300°F (700°C). Inconel X‑750 is widely used in aerospace, nuclear, and industrial applications requiring long‑term strength and reliability under high thermal and mechanical stress. For extended service at temperatures above 1,100°F (593°C), the alloy may require solution heat treatment with controlled air cooling between intermediate and final aging to fully develop its high‑temperature mechanical properties.
- Inventory & Specs
- Chemical Composition
- Physical Properties
- Mechanical Properties
- Datasheet
- Additional Info
- FAQs
Inventory Size Ranges for X750
| Type | Thickness | AMS Standards | UNS | Get a Quote |
|---|---|---|---|---|
| Coil | 0.0250" - 0.0680" | AMS 5598, AMS 5542 | UNS N07750 | Get a Quote |
| Sheet | 0.0250" - 0.0680" | AMS 5598, AMS 5542 | UNS N07750 | Get a Quote |
| Precision Reroll Strip | 0.0008" - 0.015" | Get a Quote |
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Characteristics of X750
Inconel® X‑750 exhibits excellent stress relaxation resistance, making it particularly well suited for springs, fasteners, and bolting applications exposed to sustained loads at high temperatures. The alloy is non‑magnetic and maintains enhanced elevated‑temperature strength up to 1,300°F (700°C), along with oxidation resistance in environments approaching 1,800°F (983°C). It demonstrates strong resistance to a wide range of industrial corrosive environments under both oxidizing and reducing conditions. In the fully age‑hardened condition, Inconel X‑750 also offers excellent resistance to chloride stress corrosion cracking, further supporting its use in demanding service environments.
Working with X750
Inconel® X‑750 offers good overall workability for a high‑strength nickel‑based alloy, including excellent machinability and weldability when proper techniques are used. The alloy is precipitation hardenable, with mechanical properties developed through carefully controlled solution treatment and aging processes. Machining typically requires rigid equipment, appropriate tooling, and reduced cutting speeds compared to conventional steels. Welding can be performed using standard nickel‑alloy methods, although post‑weld heat treatment is often required to restore optimal mechanical properties. Proper processing and heat treatment are critical to ensuring consistent performance in high‑temperature, high‑stress applications.
Other industry standards we comply with:
- PWA-LCS
- GE Aircraft Engine (GT193)
- GE Aviation S-SPEC-35 AeDMS S-400
- RR SABRe Edition 2
- DFARS Compliant
- W.Nr 2.4669
Common Trade Names
- ATI X-750 (™ Allegheny Technologies)
- Inconel X750 (® Special Metals)
- Alloy X 750
- Inconel® X-750
Industry Applications for X750
- Gas Turbines Discs, Thrust Reversers, Wheels and Ducts
- Aircraft Structures
- Rocket Engines
- Nuclear Reactors
- Heat Treat Fixtures
- Cryogenic Vessels, Springs, and Fasteners
- Exhaust Valves of Diesel Engines
Chemical Composition
| Element | Min | Max | |
|---|---|---|---|
| Ni/Co | Nickel + Cobalt | 70.0 | |
| Cr | Chromium | 14.0 | 17.0 |
| Fe | Iron | 5.0 | 9.0 |
| Ti | Titanium | 2.25 | 2.75 |
| Al | Aluminum | 0.4 | 1.0 |
| No/Ta | Nobelium & Tantalum | 0.7 | 1.2 |
| Si | Silicon | 0.50 | |
| S | Sulfur | 0.01 | |
| Cu | Copper | 0.50 | |
| C | Carbon | 0.08 | |
| Co | Cobalt | 1.00 | |
Physical Properties
| Property | Value |
|---|---|
| Density, lb/in³ | 0.299 |
| Melting Range | 2540-2600°F, 1395-1425°C |
| Curie Temperature | -225°F as hot-rolled -193 triple-heat-treated (2100°F/2 hr, A.C., +1500°F/24 hr, A.C. + 1300°F/20 hr, A.C.) |
| Magnetic Permeability | 70°F, 200H, as hot rolled 1.0020 1.0035 triple-heat-treated (2100°F/2 hr, A.C., +1500°F/24 hr, A.C., +1300°F/20 hr, A.C.) |
| Emissivity Oxidized Surface | 600°F 0.895, 2000°F 0.925 |
| Linear Contraction During Precipitation Treatment | 1300°F/20 hr), in/in Hot-rolled 0.00044, 20% Cold-rolled 0.00052, Annealed 0.00026 |
Mechanical Properties
| Property | Value |
|---|---|
Ultimate Tensile Strength, ksi | 120 |
.02% Yield Strength, ksi | 60 |
Elongation, % | 30 |
| Specification | Value |
|---|---|
AMS 5541 | 1300°F/20 hr., AC (Constant-temperature precipitation treatment). |
AMS 5598 | 1350°F/8 hr., FC to 1150°F, Hold at 1150°F for total precipitation-treating time of 18 hr., AC (Furnace-cool precipitation treatment). |
Additional Info
A Brief History of X750
Inconel Alloy® X‑750 is a precipitation‑hardenable nickel‑chromium alloy developed to expand upon the corrosion resistance and thermal stability of Inconel® 600 by adding significantly higher strength and stress resistance at elevated temperatures. Introduced during the rapid advancement of aerospace and nuclear technologies in the mid‑20th century, X‑750 was engineered for applications requiring long‑term mechanical stability under sustained load and heat. By incorporating aluminum and titanium for age hardening, Inconel X‑750 became a critical material for environments where both corrosion resistance and high‑temperature strength were essential.
How X750 Was Developed
Inconel® X‑750 was designed by metallurgists seeking to create a nickel‑chromium alloy that could retain the exceptional corrosion resistance of Alloy 600 while offering improved mechanical strength at elevated temperatures. The addition of aluminum and titanium enables precipitation strengthening, allowing the alloy to achieve high tensile strength, creep resistance, and excellent stress‑relaxation properties through controlled heat treatment. This precipitation‑hardening mechanism distinguishes X‑750 from solid‑solution alloys and makes proper solution treatment and aging critical to achieving its performance characteristics. The result is an alloy capable of reliable service in high‑temperature, high‑stress environments where conventional alloys would experience degradation.
Early Applications of X750
As aerospace propulsion, nuclear power, and high‑temperature industrial systems evolved, Inconel® X‑750 was quickly adopted for applications requiring sustained strength and dimensional stability under thermal load. Early uses focused on springs, fasteners, bolting, seals, and structural components where resistance to relaxation, creep, and corrosion were critical. Its ability to maintain mechanical integrity at temperatures exceeding 1,100°F (593°C) made it particularly valuable in turbine engines, reactor components, and other systems exposed to prolonged heat and stress.
How X750 Is Used Today
Today, Inconel® X‑750 remains widely specified for aerospace, nuclear, and industrial applications requiring high strength at elevated temperatures along with resistance to oxidation and corrosion. It is commonly used for aircraft and gas turbine engine components, springs and fasteners, nuclear reactor hardware, and high‑temperature sealing applications. Inconel X‑750 provides reliable performance with usable strength up to 1,300°F (700°C) and oxidation resistance in environments reaching 1,800°F (983°C). Its resistance to chloride stress corrosion cracking in the fully age‑hardened condition further supports its continued use in demanding service environments.
Your Trusted Supplier for X750
United Performance Metals is a global specialty metals solutions provider offering Inconel Alloy® X‑750 in a variety of product forms including coil, sheet, and precision rerolled strip to support critical aerospace, nuclear, and industrial applications. With deep expertise in nickel‑based alloys, comprehensive processing capabilities, and strong certification support, UPM delivers high‑performance materials that meet exacting specification and quality requirements.
Contact our team today to learn how Inconel Alloy® X‑750 can support your next high‑temperature, high‑strength application.