INCOLOY Alloy 945X (UNS N09945)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties


INCOLOY alloy 945X is a high-strength, corrosion-resistant alloy that has improved resistance to chloride induced stress corrosion cracking due to its high nickel content. The molybdenum content in its composition aids resistance to pitting and crevice corrosion. In addition, nickel with copper and molybdenum outstanding resistance to general corrosion in reducing media.

The following datasheet will provide an overview of INCOLOY alloy 945X.

Chemical Composition

The chemical composition INCOLOY alloy 945X is outlined in the following table.

Element Content (%)
Nickel, Ni 45-55
Chromium, Cr 19.5-23
Molybdenum, Mo 3-4
Niobium, Nb 2.5-4.5
Copper, Cu 1.5-3
Manganese, Mn 1
Silicon, Si 0.5
Titanium, Ti 0.5-2.5
Sulfur, S 0.03
Phosphorus, P 0.03
Aluminum, Al 0.01-0.7
Carbon, C 0.005-0.04
Iron, Fe Balance

Physical Properties

The following table shows the physical properties of INCOLOY alloy 945X.

Properties Metric Imperial
Density 8.2 g/cm3 0.296 lb/in3
Melting point 1270-1377°C 2317-2510°F

Mechanical Properties

The mechanical properties of INCOLOY alloy 945X are displayed in the following table.

Properties Metric Imperial
Tensile strength 1194 MPa 173.2 ksi
Yield strength 920 MPa 133.4 psi
Elongation at break 27.80% 27.80%

Thermal Properties

The thermal properties of INCOLOY alloy 945X are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@93°C/200°F) 14.19 µm/m°C 7.88 µin/in°F
Thermal conductivity (23°C/73°F) 10.9 W/mK 75.9².°F


The following are the list of applications of INCOLOY alloy 945X:

  • Marine and pump shafting
  • Fasteners
  • Tubular products and valves
  • Landing nipples, tool joints and packers
  • High-strength piping systems.

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