Alloy X750 / Inconel X750 is a precipitation-hardenable nickel-chromium alloy used for its corrosion and oxidation resistance and high strength at temperatures to 1300°F. Although much of the effect of precipitation hardening is lost with increasing temperature over 1300°F, heat-treated material has useful strength up to 1800°F. Alloy X-750 also has excellent properties down to cryogenic temperatures.
The economics of INCONEL alloy X-750 coupled with its availability in all standard mill forms has resulted in applications in a wide variety of industrial fields. In gas turbines, it is used for rotor blades and wheels, bolts, and other structural members. INCONEL X750 is used extensively in rocket-engine thrust chambers. Airframe applications include thrust reversers and hot-air ducting systems. Large pressure vessels are formed from INCONEL alloy X-750. Other applications are heat-treating fixtures, forming tools, extrusion dies, and test machine grips. For springs and fasteners, alloy X-750 is used from sub-zero to 1200°F.
Depending on the application and the properties desired, various heat treatments are employed. For service above 1100°F, particularly where loads are to be sustained for long times, optimum properties are achieved by solution treating (2100°F) plus stabilization treating (1550°F) plus precipitation treating (1300°F). For service below 1100°F, the alloy may be strengthened by precipitation treating after hot or cold working or by precipitation treating after equalizing or solution treating. A furnace-cooling treatment is also used to develop optimum properties for some applications.
|Property||20°C||200°C||400°C||427 °C||538 °C||600°C||649°C||732°C||816°C|
|Ultimate Tensile Strength /MPa||1503.1||1351.4||744.6||688.8||-||622.6||593||-||600|
|0.2% Yield Strength /MPa||979.1||737.7||365.4||340.6||-||278.5||250.3||-||253.7|
|Charpy Impact V-notch /J||436.6||115.2||189.8||-||-||-||-||-||-|
|Coefficient of Thermal Expansion µm/m⁰C||-||-||-||14.22||14.94||15.12||15.48||15.66||15.84|
|Thermal Conductivity /kcal/(hr.m.°C)||-||-||10||11.2||12.1||12.9||15||15.66||15.84|
|Modulus of Elasticity / x105 MPa||-||-||1.95||1.89||-||1.8||1.71||-||1.61|
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