Jul 17 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Applications
Introduction
Nickel alloy 263 is an age-hardenable nickel-cobalt-chromium-molybdenum alloy that combines high strength with good fabrication characteristics under annealed conditions. It also exhibits excellent intermediate temperature ductility and oxidation resistance that is comparable to that of other gamma-prime-strengthened superalloys.
The following sections will provide an overview of nickel alloy 263.
Chemical Composition
The chemical composition nickel alloy 263 is outlined in the following table.
|
Element |
Content (%) |
|
Nickel, Ni |
52 |
|
Chromium, Cr |
20 |
|
Cobalt, Co |
20 |
|
Molybdenum, Mo |
6 |
|
Titanium, Ti |
2.4 |
|
Iron, Fe |
0.7 |
|
Manganese, Mn |
0.6 |
|
Aluminum, Al |
0.6 |
|
Silicon, Si |
0.4 |
|
Copper, Cu |
0.2 |
|
Carbon, C |
0.06 |
Physical Properties
The following table shows the physical properties of nickel alloy 263.
|
Properties |
Metric |
Imperial |
|
Density |
8.36 g/cm3 |
0.302 lb/in3 |
|
Melting point |
1300-1355°C |
2370-2470°F |
Mechanical Properties
The mechanical properties of nickel alloy 263 are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
1050 MPa |
152.3 ksi |
|
Yield strength |
635 MPa |
92 ksi |
|
Elongation at break |
35.70% |
35.70% |
Thermal Properties
The thermal properties of nickel alloy 263 are given in the following table
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (25-100°C/70-200°F) |
11.1 µm/m°C |
6.2 µin/in°F |
|
Thermal conductivity |
11.7 W/mK |
81 BTU.in/hrft².°F |
Fabrication and Heat Treatment
Nickel alloy 263 has excellent forming and welding characteristics. It can be hot-worked at temperatures ranging from 955 to 1150°C (1750 to 2100°F). Due to its good ductility, the alloy can also be readily cold-worked. The hot- or cold-worked parts are then annealed at 1150°C (2100°F) followed by rapid air cooling.
Welding of nickel alloy 263 can be carried out using conventional techniques such as resistance welding, electron beam welding, gas metal arc welding and gas tungsten arc welding methods. Following welding, the alloy is heat treated to achieve excellent joint and fabrication properties.
Applications
The following are the list of applications of nickel alloy 263:
-
Gas turbine rings
-
Combusters
-
Liners
-
Casings