Inconel X-750 Flanges
Inconel X-750 Flanges (UNS N07750) Nickel Alloy Flanges
Inconel X-750 Flanges (UNS N07750) are high-strength, precipitation-hardenable nickel-chromium alloy flanges designed for exceptional performance in extreme temperature and pressure environments. These flanges offer outstanding resistance to oxidation, stress-corrosion cracking, and high-temperature creep, making them suitable for aerospace, power generation, nuclear reactors, and chemical processing applications.
Manufactured to international standards, Inconel X-750 flanges deliver reliable performance in temperatures up to 1300°F (704°C) and maintain excellent mechanical stability under cyclic and high-stress conditions. Their superior metallurgical structure allows them to endure severe operational challenges, where conventional stainless steel flanges may fail.
Key Features
Excellent high-temperature strength up to 704°C
Precipitation-hardened nickel-chromium alloy for superior mechanical stability
Outstanding oxidation & corrosion resistance in a wide range of harsh environments
High resistance to stress-corrosion cracking (SCC)
Exceptional creep and rupture strength
Reliable performance under cyclic loads & thermal fatigue
High metallurgical stability in long-term service
Suitable for high-pressure & high-temperature applications
Specification
| Specification | Details |
|---|---|
| Standard | ASTM B637 / ASME SB637 |
| UNS | N07750 |
| Werkstoff Nr. | 2.4669 |
| Flange Types | Weld Neck, Slip On, Blind, Threaded, Lap Joint, Socket Weld, Orifice, RTJ |
| Size Range | ½” to 48″ |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Production Technique | Forged / Plate / Cast |
| Face Type | RF, RTJ, FF |
| Dimensions | ASME B16.5, B16.47, B16.48, MSS-SP-44 |
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N07750 |
| Werkstoff Nr. | 2.4669 |
| ISO | NiCr15Fe7TiAl |
| BS | NA 51 |
Available Sizes
Flange Size: ½” – 48”
Thickness: Sch 10 to Sch XXS
Custom sizes available on request
Chemical Composition
| Element | % |
|---|---|
| Nickel (Ni) | ≥ 70 |
| Chromium (Cr) | 14 – 17 |
| Iron (Fe) | 5 – 9 |
| Titanium (Ti) | 2.25 – 2.75 |
| Aluminum (Al) | 0.40 – 1.0 |
| Niobium + Tantalum (Nb + Ta) | 0.70 – 1.20 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 |
| Carbon (C) | ≤ 0.08 |
| Sulfur (S) | ≤ 0.01 |
| Copper (Cu) | ≤ 0.5 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 1310 MPa min |
| Yield Strength (0.2% offset) | 965 MPa min |
| Elongation | 18% min |
| Hardness | 302 HB max |
| Melting Point | 1390 – 1430°C |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.28 g/cm³ |
| Electrical Resistivity | 1.29 μΩ·m |
| Thermal Conductivity | 11.4 W/m·K |
| Specific Heat | 0.106 BTU/lb·°F |
| Modulus of Elasticity | 207 GPa |
Types of Inconel X-750 Flanges
Weld Neck Flanges (WNRF)
Slip-On Flanges (SORF)
Blind Flanges (BLRF)
Socket Weld Flanges (SWRF)
Threaded Flanges (RTF)
Lap Joint Flanges (LJRF)
Orifice Flanges
Ring Type Joint (RTJ) Flanges
Long Weld Neck Flanges
Custom-Machined Flanges
Corrosion Resistance
Inconel X-750 provides remarkable corrosion resistance in:
Oxidizing and carburizing atmospheres
High-salinity and seawater environments
High-temperature gases
Chemical and petrochemical fluids
Nitric & sulfuric acid environments
Stress-corrosion cracking (SCC) in chloride media
Its high nickel content ensures stability against reducing agents, while chromium protects against pitting, crevice corrosion, and oxidation.
Heat Resistance
Excellent performance up to 1300°F (704°C)
High resistance to thermal fatigue and creep
Strong oxidation resistance at elevated temperatures
Maintains mechanical strength even under rapid temperature cycling
Heat Treatment
Inconel X-750 undergoes precipitation hardening treatments such as:
Solution Annealing at 1095°C followed by rapid quenching
Precipitation Hardening at 705°C for high mechanical strength
Specific heat-treat conditions: AH, BH, C, D1, D2, R, S depending on application
Welding
Weldable using GTAW, GMAW, SMAW
Preheating not required
Post-weld heat treatment recommended for high-stress applications
Controlled heat input ensures prevention of age-crack sensitivity
Fabrication
Easily fabricated by forming, forging, machining
Requires high-quality tooling due to work-hardening rate
Hot forging temperature: 1010–1150°C
Annealing improves ductility after cold work
Applications
Gas turbines & jet engines
Aerospace and rocket components
Nuclear power reactors
Heat exchangers & pressure vessels
High-temperature chemical processing
Power plant boilers & turbine casings
Springs & fasteners in corrosive environments
Oil & gas offshore equipment