Nickel Alloy C263 (UNS N07263)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Other Designations


Nickel alloy C263 is an aluminum-titanium age hardening nickel base superalloy welding wire. It has high corrosion resistance and strength, good formability and high temperature ductility in welded structures. It is resistant to strain age cracking problems, which is common for other gamma prime strengthened alloys.

The following section will discuss in detail about nickel alloy C263.

Chemical Composition

The chemical composition nickel alloy C263 is outlined in the following table.

Element Content (%)
Chromium, Cr 19-21
Cobalt, Co 19-21
Molybdenum, Mo 5.6-6.1
Aluminum+Titanium, Al+Ti 2.4-2.8
Titanium, Ti 1.9-2.4
Iron, Fe 0.7
Manganese, Mn 0.6
Silicon, Si 0.4
Aluminum, Al 0.3-0.6
Copper, Cu 0.2
Phosphorus, P 0.015
Sulfur, S 0.007
Boron, B 0.005
Lead, Pb 0.002
Silver, Ag 0.0005
Bismuth, Bi 0.0001
Nickel, Ni Balance

Physical Properties

The following table shows the physical properties of nickel alloy C263.

Properties Metric Imperial
Density 8.359 g/cm3 0.302 lb/in3
Melting point 1300-1335°C 2372-2471°F

Mechanical Properties

The mechanical properties of nickel alloy C263 are displayed in the following table.

Properties Metric Imperial
Tensile strength (annealed) 344.74 MPa 50000 psi
Yield strength (annealed) 90.321 MPa 13100 psi
Elongation at break (annealed) 45% 45%

Thermal Properties

The thermal properties of nickel alloy C263 are given in the following table

Properties Metric Imperial
Thermal expansion co-efficient (@204.4°C/400°F) 12.06 µm/m°C 6.7 µin/in°F

Fabrication and Heat Treatment

Nickel alloy C263 can be machined using high speed tools. Care must be taken to ensure a rigid machine setup and sharp tools, in order to prevent work hardening and surface glazing. It has excellent welding characteristics, and can be welded by most of the common welding techniques such as electron beam and resistance welding, gas metal arc welding and inert gas tungsten arc welding. Following this, the alloy is aged for 8 h at 799°C (1470°F) and air cooled.

Other Designations

Other designations that are equivalent to nickel alloy C263 include the following:

  • AMS 5872
  • AMS 5966
  • AMS 5872E
  • EN 2.4650
  • GE B50A783
  • GE B50A771
  • RR 9500/16
  • Werkstoff 2.4650


Nickel alloy C263 is used in the manufacture of gas turbines for casings, rings and other sheet fabrications.

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