INCONEL® Alloy X-750

  • N07750
  • 2.4669

Key properties

(in annealed condition)
Tensile strength: 160.00–165.00
Yield strength: 100.00–105.00
Elongation: 15.00–20.00%

Composition

Ni+Co

70.00% min

Cr

14.00-17.00%

Fe

5.00-9.00%

Ti

2.25-2.75%

Nb+Ta

0.70-1.20%

Al

0.40-1.00%

Mn

0.00-1.00% max

Si

0.00-0.50% max

S

0.00-0.01% max

Cu

0.00-0.50% max

C

0.00-0.08% max

Co

0.00-1.00% max

INCONEL alloy X-750 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 termperatures.

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.