X-750 has excellent properties down to cryogenic
termperatures. Composition is shown in Table 1.
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
alloy X-750 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, INCONEL 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.
The various heat treatments and the properties
developed are described under the section on
Mechanical Properties.
Property values in this bulletin – the results of
extensive testing – are typical of the alloy but, unless
shown as limiting, should not be used as specification
values.