X750 Sheet, Coil - AMS 5598, AMS 5542

Inconel Alloy® X-750 is a nickel-chromium austenitic 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 high temperatures to 1300°F (700°C).  Extended applications that require high strength at temperatures beyond 1100°F (593°C) may require a solution treatment, with air cooling between intermediate and final aging.

Nickel Alloy X-750 displays excellent workability including machinability and welding.  It is precipitation hardenable.  This material has excellent relaxation resistance and is non-magnetic. It has enhanced elevated temperature strength properties to 1300ºF (700°C) and oxidation resistance to 1800ºF (983˚C). Inconel® X-750 is resistant to a wide variety of industrial corrosives under both oxidizing and reducing conditions. This alloy also has excellent resistance to chloride stress corrosion cracking in the fully age hardened condition.


X750 Inventory Size Ranges


0.0250" - 0.0680"

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0.0250" - 0.0680"

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Thin Gauge Strip

0.0008" - 0.012"

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Standard Inventory Specifications

  • UNS N07750
  • AMS 5598
  • AMS 5542
  • ASTM B 637
  • ASME SB 637

Other industry standards we comply with:

  • GE Aircraft Engine (GT193)
  • GE Aviation S-SPEC-35 AeDMS S-400
  • RR SABRe Edition 2
  • DFARS Compliant
  • W.Nr 2.4669

Common Trade Names

  • ATI X-750 (™ Allegheny Technologies)
  • Inconel X750  (® Special Metals)
  • Alloy X 750
  • Inconel® X-750

Common Applications of X750

  • Structural members in hot sections of gas turbines such as discs, thrust reversers, wheels and ducts
  • Aircraft structures
  • Rocket engines
  • Nuclear reactors
  • Heat treat fixtures
  • Cryogenic vessels, springs, and fasteners
  • Wire formulation with heat temper used in springs at elevated temperatures
  • Exhaust valves of diesel engines
  • Applications that benefit from an alloy with high creep-rupture strength

Chemical Composition

Alloy X750 Chemical Composition
Element Percent by Weight
Ni Co Nickel + Cobalt 70% min
Cr Chromium 14-17%
Fe Iron 5-9%
Ti Titanium 2.25-2.75%
Al Aluminum 0.4-1.0%
No Ta Nobelium & Tantalum 0.7-1.2%
Si Silicon 0.50% max
S Sulfur 0.01% max
Cu Copper 0.50% max
C Carbon 0.08% max
Co Cobalt 1.00% max
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Alloy X750 Physical Properties

Physical Property Values



Melting Range

2540-2600°F, 1395-1425°C

Curie Temperature

-225°F as hot-rolled

-193 triple-heat-treated (2100°F/2 hr, A.C., +1500°F/24 hr, A.C. + 1300°F/20 hr, A.C.)             

Magnetic Permeability

70°F, 200H, as hot rolled 1.0020

1.0035 triple-heat-treated (2100°F/2 hr, A.C., +1500°F/24 hr, A.C., +1300°F/20 hr, A.C.)

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

INCONEL® is a registered trademark of the Special Metals Corporation group of companies.

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Mechanical Properties and Yield Strength of Alloy X750 

Minimum Specified Properties

Ultimate Tensile Strength, ksi


.02% Yield Strength, ksi


Elongation, %



Heat Treatment

AMS 5541

1300°F/20 hr., AC (Constant-temperature precipitation treatment).

AMS 5598

1350°F/8 hr., FC to 1150°F, Hold at 1150°F for total precipitation-treating time of 18 hr., AC (Furnace-cool precipitation treatment).

INCONEL® is a registered trademark of the Special Metals Corporation group of companies.

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*The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.