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Inconel X-750 (UNS N07750 / GH4145 / W.Nr. 2.4669) is a precipitation-hardenable nickel-chromium superalloy that derives its exceptional strength from the precipitation of γ′ (Ni₃(Al,Ti)) phases during controlled aging heat treatment. Unlike solid-solution strengthened alloys, X-750's core distinction is its ability to achieve significant age hardening, delivering high strength and creep resistance across a wide temperature range. The alloy contains approximately 70% nickel, 14–17% chromium, 5–9% iron, 2.25–2.75% titanium, 0.4–1.0% aluminum, and 0.7–1.2% niobium.
This nickel base superalloy is defined by ASTM B637 for bar and rod, ASTM B670 for plate and sheet, and ASTM B983 for seamless pipe and tube. It is also available in wire, spring wire, forging, and fastener forms. With high strength up to 1300°F (704°C), oxidation resistance up to 1800°F (982°C), and outstanding relaxation resistance below 1000°F (540°C), Inconel X-750 is the preferred material for aerospace engines, gas turbines, nuclear reactors, high-temperature springs and fasteners, and power generation equipment. Available in a full range of product forms including GH4145 round bar, Inconel X-750 plate, sheet, pipe, tube, and spring wire.
Composition | C | Si | Mn | P | S | Cr | Ni+Co | Ti | Al | Fe | Nb+Ta | Cu |
Min | \ | \ | \ | \ | \ | 14.00 | 70.00 | 2.25 | 0.40 | 5.00 | 0.70 | \ |
Max | 0.08 | 0.50 | 1.00 | 0.015 | 0.010 | 17.00 | \ | 2.75 | 1.00 | 9.00 | 1.20 | 0.50 |
Rigidity | Tensile strength | Yield strength | Elongation |
≤400 | ≥995MPa | ≥550MPa | ≥35% |
Density | Melting points | Specific heat | Magnetism | Resistivity | Thermal conductivity | Linear expansivity |
8.25g/cm3 | 1395-1425℃ | 420J/(Kg.℃） | \ | 1.22×10-6Ω·m(20℃) | 15.9W/(m.k)(100℃) | 13.1×10-6/K(200℃) |
GH4145 Alloy belongs to the precipitation-hardening nickel alloy family. Its performance is achieved through controlled heat treatment, allowing the alloy to develop high strength and stable mechanical properties.
The key characteristics include:
High Temperature Strength
The alloy maintains mechanical strength at elevated temperatures, making it suitable for aerospace and turbine components exposed to continuous thermal loads.
Creep and Stress Rupture Resistance
GH4145 Superalloy provides resistance against deformation during long-term high-temperature operation, which is essential for rotating and structural components.
Oxidation Resistance
The alloy offers good oxidation resistance in high-temperature environments, supporting longer service life for exposed components.
Precipitation Hardening Performance
Through solution treatment and aging treatment, GH4145 Nickel Alloy achieves enhanced hardness and strength for demanding engineering applications.
Mono Group supplies GH4145 Nickel Alloy in various forms for aerospace, turbine, and high-temperature engineering applications. Available product forms include round bars, forgings, plates, sheets, and customized sizes according to component requirements.
| Product Form | Common Specifications | Typical Applications |
GH4145 Round Bar | AMS 5665 | Machined components, shafts, fasteners, rotating parts |
GH4145 Forging | AMS 5665 | Aerospace structural parts, turbine components |
GH4145 Sheet & Plate | AMS 5596 | Fabricated high-temperature components |
GH4145 Wire | AMS 5699 | Springs, fastening components, specialty applications |
For different engineering requirements, GH4145 Superalloy can be supplied with controlled manufacturing conditions, including:
Solution treated GH4145 material
Aging treated GH4145 alloy
Heat treated GH4145 products
Precision machined GH4145 components
Custom size GH4145 material
During procurement, customers usually evaluate:
Material Certification
Complete documentation including chemical composition, mechanical properties, and heat treatment records can be provided according to project requirements.
Dimensional Control
GH4145 products can be supplied with customized dimensions and tolerances for machining and fabrication applications.
Application Requirements
Selecting the correct product form is important. GH4145 Round Bar is commonly used for machining applications, while GH4145 Forging is preferred for components requiring higher structural reliability.
1. Aerospace Engine Components
GH4145 Superalloy is widely used in aerospace applications where high strength-to-weight performance and thermal stability are required. Typical applications include engine structural parts, rotating components, and high-temperature fasteners.
For aircraft engine manufacturers, GH4145 Aerospace Alloy is selected when components need reliable performance under repeated heating and mechanical loading conditions.
Turbine and Power Generation Components
In gas turbine systems, materials used for rotating and load-bearing parts must maintain strength during continuous operation. GH4145 Nickel Alloy is suitable for turbine-related components requiring high temperature strength and fatigue resistance.
Typical applications include:
Turbine discs
Rotating shafts
High temperature bolts and fasteners
Turbine structural components
2. Industrial High Temperature Equipment
Beyond aerospace applications, GH4145 High Temperature Alloy can also be considered for industrial equipment operating under elevated temperatures, especially where mechanical durability is more important than corrosion resistance.
Applications may include:
High temperature machinery components
Heat-resistant fastening systems
Furnace supporting parts
Power generation equipment
Q: What is the difference between Inconel X-750 and Inconel 718?
A: Both are precipitation-hardenable nickel superalloys, but they are optimized for different applications. Inconel X-750 is strengthened by aluminum and titanium (forming γ′ precipitates) and offers excellent relaxation resistance, making it the preferred choice for high-temperature springs and fasteners. Inconel 718 is strengthened by niobium (forming γ″ precipitates) and offers higher tensile strength and better weldability, making it more suitable for turbine discs and complex welded structures.
Q: What is the maximum operating temperature for Inconel X-750?
A: Inconel X-750 is suitable for continuous service up to 1300°F (704°C) and offers oxidation resistance up to 1800°F (982°C). Its excellent relaxation resistance is most valuable below 1000°F (540°C). Much of the precipitation hardening effect is lost above 1300°F, though heat-treated material retains useful strength up to 1800°F.
Q: What are the key ASTM standards for Inconel X-750?
A: ASTM B637 covers bar, rod, and wire (with ASME SB637 for pressure vessel applications); ASTM B670 covers plate, sheet, and strip (with ASME SB670); ASTM B983 covers seamless pipe and tube. Aerospace specifications include AMS 5667 and AMS 5668 for bar, AMS 5669 for forging, and AMS 5698/5699 for wire and spring wire.
Q: What is the difference between GH4145 and Inconel X-750?
A: GH4145 is the Chinese designation for the same material as Inconel X‑750 (UNS N07750). Both refer to the same nickel-chromium precipitation-hardenable superalloy with identical composition and properties. The two designations are interchangeable — GH4145 is used in Chinese standards, while Inconel X‑750 is the international trade name.
Mono Group supplies GH4145 Nickel Alloy for customers requiring reliable performance in aerospace, turbine, and high-temperature engineering applications.
With experience in supplying nickel-based alloys, we support GH4145 Round Bar, GH4145 Forging, GH4145 Plate and other customized material requirements according to customer specifications, dimensions, and application conditions.
From material selection to production coordination, Mono Group helps customers source high temperature superalloys with suitable standards, sizes, and delivery solutions.
For GH4145 Superalloy availability, technical requirements, or quotation requests, please contact Mono Group at info@monokj.com.
