INCOLOY Alloy 945 (UNS N09945)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Applications

Introduction

INCOLOY alloy 945 is a high-strength, corrosion-resistant alloy whose properties are enhanced by the presence of aluminum, titanium, niobium, copper and molybdenum in its composition. The alloy’s nickel content provides resistance to chloride-induced stress corrosion cracking. Molybdenum also imparts resistance to localized attacks such as crevice corrosion and pitting.

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

Chemical Composition

The chemical composition INCOLOY alloy 945 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 945.

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 945 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 945 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 75.9 BTU.in/hrft².°F

Fabrication and Heat Treatment

INCOLOY alloy 945 exhibits good machinability under solution annealed or aged conditions. Rigid tools with positive rake angles must be used in order to minimize work hardening of the material. It can be an be readily welded by the gas-tungsten-arc welding and pulsed gas-metal-arc welding processes. The alloy is annealed 1010-1066°C (1850-1950°F) for 1/2 to 4 h and then water quenched. Following this, the alloy is age-hardened at 704-732°C (1300-1350°F) for 6-8 h and furnace cooled at 26-56°C (50-100°F).

Applications

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

  • Downhole oil and gas applications
  • Fasteners
  • High strength piping systems
  • Pump shafting.

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