Inconel X-750 (UNS N07750)
Overview of Inconel X-750 Alloy
Inconel X-750 (UNS N07750) is a precipitation-hardened nickel-chromium alloy designed for high-temperature service. It combines strong creep resistance, good oxidation resistance, and stable mechanical properties across a wide temperature range, typically up to 600–700°C. The alloy is widely used in applications requiring long-term load-bearing performance under heat, such as springs, fasteners, turbine components, and nuclear reactor parts. Its strength retention at elevated temperatures makes it a reliable material for demanding aerospace and industrial environments.
Key Features of Inconel X-750 (UNS N07750)
High Temperature Strength
Maintains excellent mechanical strength and creep resistance at 600–700°C operating range.
Oxidation & Corrosion Resistance
Stable performance in oxidizing environments, steam, and high-temperature water conditions.
Thermal Stability
Retains toughness in cryogenic conditions and structural stability at elevated temperatures.
Stress Relaxation Resistance
Excellent resistance to deformation under long-term mechanical load, ideal for springs and fasteners.
Available Product Forms
Bar Products
- Round Bar
- Flat Bar
- Hex Bar
Sheet & Strip
- Sheet
- Plate
- Strip / Coil
Wire Products
- Wire
- Spring Wire
Tube Products
- Seamless Tube
- Welded Tube (on request)
Forgings
- Forged Rings
- Discs
- Blanks
Fasteners & Springs
- Bolts & Nuts
- High-temperature Springs
- Custom Machined Parts
Chemical Composition of Inconel X-750 (UNS N07750)
Typical chemical composition range (weight %):
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Min 70.0 |
| Chromium (Cr) | 14.0 – 17.0 |
| Iron (Fe) | 5.0 – 9.0 |
| Niobium + Tantalum (Nb+Ta) | 0.7 – 1.2 |
| Titanium (Ti) | 2.25 – 2.75 |
| Aluminum (Al) | 0.40 – 1.00 |
| Carbon (C) | Max 0.08 |
Mechanical Properties of Inconel X-750 (UNS N07750)
Mechanical properties vary depending on heat treatment condition (solution annealed / aged / cold worked). Typical room temperature values are listed below:
| Property | Typical Value |
|---|---|
| Tensile Strength | 900 – 1450 MPa (depending on condition) |
| Yield Strength (0.2%) | 550 – 1150 MPa |
| Elongation | 12 – 35% |
| Hardness | 25 – 45 HRC (aged condition) |
| Young’s Modulus | ~ 200 GPa |
| Service Temperature Range | Up to 600 – 700°C (long-term load-bearing service) |
Physical Properties of Inconel X-750 (UNS N07750)
Typical physical properties at room temperature unless otherwise stated.
| Property | Value |
|---|---|
| Density | 8.28 g/cm³ |
| Melting Range | 1390 – 1430 °C |
| Modulus of Elasticity | ~ 214 GPa |
| Thermal Conductivity | ~ 11–12 W/m·K |
| Thermal Expansion Coefficient | ~ 13–15 µm/m·°C (20–1000°C) |
| Electrical Resistivity | ~ 1.2–1.3 µΩ·m |
| Specific Heat Capacity | ~ 430–460 J/kg·K |
Applications of Inconel X-750 (UNS N07750)
Aerospace Industry
- Gas turbine engine components
- Afterburner parts
- Exhaust systems
- Heat-exposed structural parts
Power Generation
- Steam turbine blades and rotors
- Nuclear reactor springs and spacers
- High-temperature fasteners
- Thermal power plant components
Oil & Gas / Chemical Processing
- High-temperature springs and seals
- Downhole fasteners and components
- Corrosion + thermal cycling service parts
- Pressure and sealing systems
Industrial High-Temperature Equipment
- Furnace components
- Heat treatment fixtures and trays
- Thermal processing tooling
- High-heat support structures
Fasteners & Springs
- Bolts, nuts, washers
- Spring washers and retaining rings
- High-temperature springs
- Stress relaxation resistant parts
Special Engineering Systems
- Defense and aerospace assemblies
- Cryogenic to high-temperature systems
- Precision mechanical components
- Critical reliability applications
Standards and Product Forms of Inconel X-750 (UNS N07750)
Typical international standards corresponding to different product forms.
| Product Form | ASTM Standard | UNS | Condition | Typical Application |
|---|---|---|---|---|
| Seamless Pipe | ASTM B983 | N07750 | Solution Annealed / Age Hardened | High Temperature Piping Systems |
| Seamless Tube | ASTM B983 | N07750 | Solution Annealed / Age Hardened | Aerospace and Thermal Systems |
| Welded Pipe | ASTM B983 | N07750 | Solution Annealed | Industrial Service Systems |
| Welded Tube | ASTM B983 | N07750 | Solution Annealed | Process Tubing Applications |
| Plate / Sheet / Strip | ASTM B670 | N07750 | Solution Annealed | Gas Turbine Structures and Heat Resistant Components |
| Bar / Rod | ASTM B637 | N07750 | Age Hardened | Springs, Fasteners, Turbine Components |
| Wire | ASTM B637 | N07750 | Age Hardened | High Temperature Springs and Retaining Rings |
| Forgings | ASTM B637 | N07750 | Age Hardened | Turbine Discs, Aerospace Hardware |
| Flanges | ASTM B637 | N07750 | Solution Annealed | High Pressure Piping Systems |
| Pipe Fittings | ASTM B366 | N07750 | Solution Annealed | Elbows, Tees, Reducers and Pipe Connections |
Why Choose Inconel X-750?
High-Temperature Reliability
Maintains mechanical strength and structural stability under continuous service at 600–700°C, making it suitable for long-term heat exposure environments.
Excellent Creep & Stress Resistance
Strong resistance to creep deformation and stress relaxation ensures dimensional stability in load-bearing components such as springs and fasteners.
Oxidation & Corrosion Resistance
Performs well in oxidizing environments, steam, and high-temperature water, reducing failure risk in harsh operating conditions.
Wide Engineering Applications
Suitable for aerospace, nuclear power, turbine systems, and industrial heat processing equipment where reliability is critical.
Versatile Product Availability
Available in bar, sheet, wire, tube, and forging forms, supporting both standard and custom-engineered components.
Proven Industrial Performance
Widely adopted in safety-critical systems where failure is not acceptable, ensuring long-term operational confidence.
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