Inconel X-750® is a nickel-chromium alloy that becomes precipitation-hardenable with the additions of titanium and aluminum. This nickel alloy is used in diverse industries and sectors due to its corrosion and oxidation resistance, as well as high strength at temperatures up to 1300°F. Alloy X-750 is widely available in diverse types of standard mill forms, and can be found in aircraft structures, gas turbines, and nuclear reactors.

Alloy X-750 was essentially developed from Alloy 600 by adding titanium and aluminum to it, so as to make the alloy precipitation hardenable.  This material has quite commendable mechanical properties at high temperatures up to 704°C, and tends to demonstrate a great formability as well.

Inconel X750 Price Per Kg

Inconel X750 PriceOriginPrice in INR
(per kg)
Price in USD
(per kg)
Price in Euro
(per kg)
Nickel Alloy X750 Price in IndiaIndianRs 5500/-$80€68
Alloy X750 Price in JapanJapaneseRs 6200/-$91€78
N07750 type 3 Price in UK / EuropeEuropeanRs 6900/-$101€87
N07750 material Price in USAUSARs 7500/-$110€94

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The prime characteristics of Inconel X750

  • Subsequent to heat treatment high temperatures up to 816°C/1500°F is suitable
  • Has good creep-rupture strength at high temperatures to approximately 1290°F/700°C
  • Boasts of great creep-rupture and high tensile properties
  • Enjoys resistance to an expansive range of industrial corrosives under both reducing and oxidizing conditions
  • Has quite an impressive workability, which includes both welding and machinability
  • Has a good level of resistance to chloride ion stress-corrosion cracking
  • Precipitation hardenable

Corrosion Resistance

Inconel X750 is known to be resistant to various types of industrial corrosives under both reducing and oxidizing conditions. It has the capacity to resist attack and oxidation by diverse other high temperature corrosion mechanisms. The performance of this nickel alloy tends to be similar to that of Inconel Alloy 600.

Even in the fully precipitation-hardened conditions, Alloy X750 is known to have high resistance to chloride-ion stress-corrosion cracking. This is among the most interesting features of this material.  The standard U-bend specimens of precipitation-hardened materials usually do not show any signs of cracking when it is exposed to boiling 42% magnesium chloride for a period of 30 days.

Fabricating Inconel X750

Alloy X-750 is typically known to be fabricated readily by processes that are commonplace in the industry. Tools and procedures should ideally be selected after making sure that they are ideal for the characteristic strain-hardening rates and high strength of this alloy. It additionally is crucial to take special care that the material is in the perfect condition that is recommended for a certain operation.

  • Hot Forming:  Owing to the resistance it has to deformation, it is vital to use adequately powerful equipment and tools when hot-forming Alloy X-750. 1800°-2200°F is the recommended range for conducting a hot working process on this alloy, and it is vital to pay heed to the fact that any type of heavy hot working must be done above 1900°F on it. Forgings can ideally be completed with a bit of reductions in temperature, while being at a range of 1800°-1900°F. Any attempts to work on this alloy below 1800°F may result in splitting as the metal would be stiff and hard to move at such a temperature. Steam hammers are known to be quite well suited for working on this alloy as the work can be handled rapidly with a minimum of chilling
  • Cold Forming: There are a number of processes with the help of which Alloy X-750 can be successfully cold formed. However, special care should be taken for the purpose of incorporating adequate anneals when forming an operation that comprises of successive reductions, so as to guard against rupturing.

Welding of Inconel X750

Alloy X-750 can be welded readily with the help of the processes of pressure-oxyacetylene, gas-tungsten-arc, electron-beam, and plasma-arc welding. The INCONEL Filler Metal 718 must be used when trying to weld this material by the gas-tungsten-arc process. Joint efficiencies are known to be about 100% at room temperature, while it is 80% at 1300°-1500°F.

Alloy X-750 must ideally be solution treated or annealed before the process of welding. It is ideally possible to weld this material when this nickel alloy is in the precipitation-treated condition, however, neither the heat-affected zone nor the weld should be subsequently exposed to service temperatures or precipitation-treated within the precipitation-hardening temperature range due to the danger of parent-metal cracking. If this alloy has been welded after being precipitation-hardened, as well as is expected to be exposed to distinct precipitation-treating temperatures during service, it is crucial to make sure that the weldment must be solution-treated or annealed and then re-precipitation-treated. To reduce high stress, a good level of care should be taken during the process of welding and assembling.

Exceptional Properties:

High Strength, Corrosion Resistance

ElementMin %Max %
C0.08
Mn1.00
Si0.50
S0.01
Cr14.0017.00
Ni70.00
Nb/Cb0.701.20
Ti2.252.75
Al0.401.00
Fe5.009.00
Co1.00
Ta0.05
Cu0.50

Nickel Alloy X750 Melting Point

Density: 8.276 g/cm³
Melting range: 1393-1427°C
Poisson’s ratio: 0.3
Electrical resistivity: 1.22 x 10-6 Ω⋅m
Corrosion resistance: PREN (PREN = %Cr + 3.3x%Mo + 16x%N) 44

Density8.28g/cm³0.299 lb/in³
Melting Point1430°C2600°F
Coefficient of Expansion12.6 μm/m °C (20 – 100°C)7.0 x 10-6 in/in °F (70 – 212°F)
Modulus of Rigidity75.8 kN/mm²10994 ksi
Modulus of Elasticity
(Spring Temper + Aged)
(Spring Temper + 3 Part Heat Treated)
(No.1 Spring Temper + Aged)
218.0 kN/mm²
212.4 kN/mm²
213.7 kN/mm²
31619 ksi
30806 ksi
30995 ksi

Applications of Inconel X750

  • Rocket engines
  • Pressure vessels
  • Aircraft structures
  • Nuclear reactors
  • Gas turbines

This nickel alloy tends to find applications in a number of high-temperature structures.

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