Inconel X750 Sheet

Inconel X750 (also known as UNS N07750) is a nickel-chromium alloy blended with aluminum and titanium to enable precipitation hardening. It exhibits corrosion and oxidation resistance, along with excellent mechanical properties at temperatures up to 700°C (1290°F), including high tensile strength and creep rupture strength. Additionally, Inconel X750 demonstrates superior strength and toughness under solution and precipitation heat treatment conditions. Consequently, IN X750 is widely used in parts and structures operating under high-temperature conditions. Typical aerospace applications include turbine blades, wheels, and bolts for gas turbines, thrust chambers for jet and rocket engines, hot air duct systems, and thrust reversers for aircraft fuselages. It is also employed in large pressure vessels, forming tools, extrusion dies, nuclear power plant applications, and heat treatment fixtures.

 

 

 

 

Main Composition

Nickel (Ni) ≥70.0%, Chromium (Cr) 14.0–17.0%, Iron (Fe) 5.0–9.0%, plus Titanium (Ti), Aluminum (Al), and Niobium (Nb) as strengthening elements.

Nickel (Ni): Provides austenitic matrix structure, ensuring corrosion resistance and high temperature toughness.
Chromium (Cr): generates a dense oxide film at high temperatures, improving oxidation resistance.
Iron (Fe): improves mechanical properties and reduces alloy costs.
Titanium (Ti) and aluminum (Al): form a γ 'precipitate phase, which is the core source of alloy strength.
Niobium (Nb): combines with nickel to form carbides and strengthening phases, improving creep life.
Low carbon, low sulfur: Avoid intergranular corrosion and improve weldability.

 

Equivalent Grades

China: GH4145 (former grade GH145)

USA: UNS N07750

Germany: W.Nr. 2.4669

Specification Standards:

Sheet/Plate: AMS 5542, AMS 5598

General Industry: ASTM B637

Chinese Standard: GB/T 15007

 

Density: 8.25 g/cm ³
Melting point: 1390-1430 ℃
Tensile strength (at room temperature): ≥ 1100 MPa
Yield strength (0.2%): ≥ 800 MPa
Elongation rate: ≥ 15%
Hardness: Approximately 330 HB
Summary of Performance Characteristics:
Maintain good creep and durability strength at temperatures up to 700 ℃.
Strong oxidation resistance, suitable for long-term high-temperature service.
Has good fatigue resistance and stress corrosion resistance.

 

Hot processing
Forging temperature range: 1010 ° C-1200 ° C (1850 ° F-2200 ° F). It is recommended to preheat the furnace temperature to this range before heating, and control the deformation in the low and high temperature sections to avoid cracking. After hot processing, rapid cooling (water quenching or rapid air cooling) is usually required.
Cold processing

Alloys can be cold processed in the solution annealed state, but due to their higher strength, they require greater power than austenitic stainless steel. The work hardening rate is moderate.
Heat treatment system (common standards AMS 5668, 5669, 5703)
Annealing treatment: Heat to 955 ° C (1750 ° F) for insulation, followed by air cooling. Used to soften materials for subsequent processing.
Precipitation hardening (aging treatment):

• Option A (High temperature application): Heat to 1150 ° C (2100 ° F) for solution treatment for 2 hours, air cool+845 ° C (1550 ° F) for aging for 24 hours, air cool+705 ° C (1300 ° F) for aging for 20 hours, air cool.
• Option B (elastic elements such as springs): Heat to 980 ° C (1800 ° F) for solution treatment for 1 hour, air cool+730 ° C (1350 ° F) for aging for 16 hours, air cool.

The solid solution heat treatment system for the supply status of plates, strips, and pipes is 980 ℃± 15 ℃, air-cooled. The intermediate heat treatment system for materials and parts can be selected from the following processes for heat treatment.

 

• Annealing: 955-1010 ℃, water cooling.
• Annealing of welded parts before welding: 980 ℃, 1h.
• Stress relief annealing of welded parts: 900 ℃, moisture retention for 2 hours.
• Stress relief annealing: 885 ℃± 15 ℃, 24 hours, air-cooled.

 

 

• Welding

Has good weldability. Tungsten inert gas welding (TIG/GTAW), metal inert gas welding (MIG/GMAW), or plasma welding can be used.
The recommended filler metal is usually homogeneous Inconel X-750 welding wire or Inconel 82/182 solder. After welding, aging treatment is required to restore the strength of the welding area.

• Machining

It is recommended to perform rough machining in the solution annealed state, leaving a margin, and then perform precision machining after aging treatment. Due to the high toughness and fast work hardening of the material, it is necessary to use hard alloy cutting tools and maintain continuous feed. Cold working performance: Work hardening is prone to occur during the cold working process. Timely solution treatment is required to prevent cracking during cold processing.

• Forging

Inconel X750 forging can be carried out using common industrial techniques, including hot forming and cold forming. Ensure the selection of programs and tools with high strength and hardness that are most suitable for the alloy. The recommended temperature range for hot working Inconel X-750 is 1800 ° -2200 ° F. When carried out below 1800 ° F, the alloy will be difficult to use, which may lead to cracking.

 

Inconel X-750 specifications and supply status
We can supply various specifications of bars, forgings, rings, hot-rolled plates, cold-rolled plates, strips, pipes, and wires.

• Plates and strips are generally supplied after hot rolling or cold rolling, annealing or solution treatment, acid washing and polishing.
• Bars, forgings, and rings can be supplied in the forged or hot-rolled state; It can also be supplied through solution treatment after forging; The rod can be polished or polished after solution treatment, and can be placed in a cold drawn state when required by the order.
• Silk material can be supplied in a solid solution state; For wire materials with a nominal diameter or thickness of 6.35mm or less, they can be supplied with 50% to 65% cold tensile deformation after solid solution treatment; Wire materials with a nominal diameter or side length greater than 6.35mm shall be supplied with a cold tensile deformation of not less than 30% after solution treatment. For wire materials with a nominal diameter or side length not exceeding 0.65mm, they shall be supplied with a cold tensile deformation of not less than 15% after solution treatment as required.

 

• High temperature resistance: Inconel X-750 alloy can maintain stable mechanical and chemical properties in high temperature environments up to 700 ℃, without significant creep or strength loss due to high temperatures. This characteristic makes it widely used in high-temperature components of aerospace engines and petrochemical equipment.
• Corrosion resistance: Inconel X-750 alloy exhibits excellent corrosion resistance in various corrosive media, especially in high temperature and high pressure environments containing sulfur and chlorine, where its corrosion resistance is particularly outstanding. This makes it an ideal material for key components such as control rods in nuclear reactors and corrosion-resistant pipelines in petrochemicals.
• Good mechanical properties: Inconel X-750 alloy has high yield strength and tensile strength, as well as good toughness and ductility. This enables it to maintain structural integrity and stability even under complex stress and deformation.
• Excellent workability and weldability: Although Inconel X-750 alloy has high strength and hardness, it still has good workability and weldability. This allows it to be made into complex shapes and structures through various molding and welding techniques.

 

 

 

• Aerospace: gas turbine blades, combustion chamber support rings, bolts, rocket engine thrust chambers, springs.
• Nuclear engineering: reactor control rod drive mechanism, fuel element grid, springs, and fasteners (due to their resistance to neutron irradiation and high-temperature water corrosion).
• Industry: hot extrusion molds, various high-temperature springs and clips, molding tools, turbocharger rotors.
• Petrochemical industry: wellhead equipment and valve springs used in corrosive environments.

 

 

 

Q: What are the main chemical components of Inconel X750 sheet?
A: The main components include Nickel (Ni, 70% min), Chromium (Cr, 14-17%), Iron (Fe, 5-9%), with strengthening elements such as Aluminum (Al, 0.40-1.0%), Titanium (Ti, 2.25-2.75%), and Niobium (Nb, 0.70-1.2%).

 

Q:What are the corresponding standard designations for this material?
A:UNS: N07750,W. Nr./EN: 2.4669,ASTM: B 637,Aerospace Specifications (AMS): AMS 5542 and AMS 5598 are commonly used for sheet.

 

Q:What are the common heat treatment conditions for Inconel X750 sheet?
A: Inconel X750 requires heat treatment to achieve optimal properties. For sheet, common specifications include:

AMS 5542: Constant temperature precipitation treatment (1300°F/20 hr, air cool) to achieve high strength up to 1300°F.

AMS 5598: Furnace-cooled precipitation treatment (1350°F/8 hr, furnace cool to 1150°F, maintain total precipitation treatment time of 18 hr, air cool) to enhance tensile properties up to 1100°F.

 

Q: Is this material suitable for sour (sulfide-containing) service environments?
A: Yes, UNS N07750 (Inconel X750) is listed in NACE MR0175 / ISO 15156 (Tables A.35 and A.36) for use as non-pressure retaining parts and springs in sour service. Note that specific heat treatment requirements are typically mandated to avoid sensitization.

 

Q: What is the difference between Inconel X750 and standard stainless steel?
A: Compared to 300 series stainless steels, Inconel X750 offers significantly higher tensile and creep strength at elevated temperatures. It gains strength through precipitation hardening rather than primarily through cold working or martensitic transformation. Additionally, its oxidation resistance at high temperatures is generally superior.

 

Q: Where can I find more detailed Technical Data Sheets (TDS) for this material?
A: Detailed TDS can be obtained from material suppliers (e.g., United Performance Metals, Lamineries MATTHEY SA) or specialized materials databases (e.g., UL Prospector, GlobalSpec). Refer to standard specifications such as AMS 5542, AMS 5598, or ASTM B 637.

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