X-750

X-750

Alloy X-750 is a nickel chromium alloy similar to Alloy 600 but made precipitation hardenable by additions of aluminum and titanium. It has good resistance to corrosion and oxidation along with high tensile and creep-rupture properties at temperatures to 1300°F. Its excellent relaxation resistance is useful for high temperature springs and bolts. Used in gas turbines, rocket engines, nuclear reactors, pressure vessels, tooling, and aircraft structures.

Chemistry

 NiCrCMnCuSiSFe
MIN 70.00 14.00 -- -- -- -- -- 5.00
MAX -- 17.00 0.08 1.00 0.50 0.50 0.01 9.00

Specifications

AMS 5542, AMS 5598, AMS 5670, AMS 5671
ISO 15156-3
NACE MR0175
UNS N07750
W. Nr./EN: 2.4669

Inventory

X-750 Sheet

Common Trade Names

X 750, Inconel® X-750

Features

  • Good mechanical properties at high temperatures
  • Good formability
  • Good oxidation resistance

Applications

  • Oil and gas production
  • Gas turbine engines
  • Nuclear engineering

Physical Properties

Density: 0.299 lb/in3
Melting Point: 2540- 2600°F
Poisson's Ratio: 0.30
Electrical Resistivity: 731 Ohm-circ mil/ft

Temperature, °F 68 392 752 800 1000 1112
Coefficient* of Thermal Expansion, in/in°F x 10-6 - 7.1 7.7 9.2 10.1 8.3
Thermal Conductivity
Btu • ft/ft2 • hr • °F		 6.8 -- -- -- -- --
Modulus of Elasticity, Dynamic psi x 106 32.1 30.5 28.6 23.9 20.3 26.2

* 70°F to indicated temperature.

Mechanical Properties

Minimum Specified Properties, ASTM A 240

Ultimate Tensile Strength, ksi 120
0.2% Yield Strength, ksi 60
Elongation, % 30
Hardness MAX, Brinell --

Typical Tensile & Impact Properties, Bar ¾ equalized and precipitation treated hot-rolled, 1625°F 24 hours, AC + 1300°F for 20 hours, AC

Temperature,°F 600 800 1000 1100 1200 1350 1500
Ultimate Tensile Strength, ksi 169.0 166.0 163.5 159.0 143.0 107.0 65.4
0.2% Yield Strength, ksi 116.5 114.0 115.0 112.0 110.0 98.3 64.7

INCONEL® and INCOLOY® are registered trademarks of Special Metals (PCC)