Inconel X750

Inconel X750 | UNS N07750 | AMS 5542 | AMS 5598 | MIL-N-7786

Inconel X750 Strip, Coil, Foil, Spring Temper Wire, Round Bar, Sheet, Plate, MIL-N-7786

INCONEL alloy X-750 (UNS N07750/W. Nr. 2.4669) 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 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 stabilisation 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 equalising 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.

Limiting Chemical Composition (%)

  • Nickel (plus Cobalt)……………………………………………70.00 min.
  • Chromium…………………………………………………………14.0-17.0
  • Iron…………………………………………………………………..5.0-9.0
  • Titanium……………………………………………………………2.25-2.75
  • Aluminum…………………………………………………………0.40-1.00
  • Niobium (plus Tantalum)……………………………………0.70-1.20
  • Manganese………………………………………………………..1.00 max.
  • Silicon……………………………………………………………….0.50 max.
  • Sulfur………………………………………………………………..0.01 max.
  • Copper………………………………………………………………0.50 max.
  • Carbon………………………………………………………………0.08 max.
  • Cobalt1 ……………………………………………………………..1.00 max

Effects of temperature on modulus of elasticity and additional data on resistivity. More modulus values can be found in the section on Mechanical Properties.

Physical Constants
1 Determination not required for routine acceptance.

  • Density,
    lb/in3 …………………………………………………………………………………………………….0.299
    g/cm3 …………………………………………………………………………………………………….8.28
  • Melting Range,
    °F……………………………………………………………………………………………………………2540-2600
    °C……………………………………………………………………………………………………………1393-1427
  • Curie Temperature, °F
    As hot-rolled……………………………………………………………………………………………-225
  • Triple-heat-treated
    (2100°F/2 hr, A.C.,+1500°F/24 hr, A.C., + 1300°F/20 hr, A.C.)….-193
  • Magnetic Permeability, 70°F, 200H
    As Hot-Rolled………………………………………………………………………………………….1.0020
  • Triple-heat-treated
    (2100°F/2 hr, A.C.,+1500°F/24 hr, A.C., + 1300°F/20 hr, A.C.)……………………1.0035
  • Emissivity, oxidized surface
    600°F……………………………………………………………………………………………………..0.895
    2000°F……………………………………………………………………………………………………0.925
  • Linear Contraction during Precipitation Treatment (1300°F/20 hr), in/in
    Hot-Rolled………………………………………………………………………………………………0.00044
    20% Cold-Rolled………………………………………………………………………………………0.00052
    Annealed…………………………………………………………………………………………………0.00026

UNS N07752 is available in billet for forging. UNS N07752 has limits on the Carbon and Cobalt levels (each has a maximum of 0.05%).

Availability

Alloy X-750 is available in Round Bar, Flat Bar, Sheet, Strip, Plate, Forging Stock, Hexagon, Wire, Tube, Welding Wire and Extruded Section . Ex-stock is available in Round Bar – Equalized or Sheet & Plate. For all stock availability contact Sales.

Specifications

Rod: ASTM B 637, ASME SB 637, ISO 9723, ISO9724, ISO9725, AMS 5667, AMS 5668, AMS 5669, AMS 5670, AMS 5671, AMS 5747, EN10269
Bar: ASTM B 637, ASME SB 637, ISO 9723, ISO9724, ISO9725, AMS 5667, AMS 5668, AMS 5669, AMS 5670, AMS 5671, AMS 5747, EN10269
Forging Stock: ASTM B 637, ASME SB 637, ISO 9723, ISO9724, ISO9725, AMS 5667, AMS 5668, AMS 5669, AMS 5670, AMS 5671, AMS 5747, EN10269
Plate: ISO 6208, AMS 5542 and AMS 5598
Sheet: ISO 6208, AMS 5542 and AMS 5598
Strip: ISO 6208, AMS 5542 and AMS 5598
Wire: BS HR 505, AMS 5698, AMS 5699
Other: UNS N07750, W.Nr 2.4669, Inconel X750 (tradename), UNS N07752

 

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