Jul 24 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Applications
Introduction
Nickel alloy 188 is a high-performance nickel alloy with good oxidation resistance, excellent high temperature strength. It has good ductility even after prolonged exposure to temperatures of 760-871.1°C (1400-1600°F).
The high chromium content, addition to small quantities of lanthanum, in its composition improves the oxidation resistance of this alloy. It also possesses good fabricability and weldability.
The following sections will discuss in detail about nickel 188 alloy.
Chemical Composition
The chemical composition nickel alloy 188 is outlined in the following table.
|
Element |
Content (%) |
|
Cobalt, Co |
30.965 - 46.73 |
|
Nickel, Ni |
20 - 24 |
|
Chromium, Cr |
20 - 24 |
|
Tungsten, W |
13 - 16 |
|
Iron, Fe |
≤3 |
|
Silicon, Si |
0.20 - 0.50 |
|
Manganese, Mn |
≤0.15 |
|
Carbon, C |
0.050 - 0.15 |
|
Lanthanum, La |
0.020 - 0.12 |
|
Boron, B |
≤0.015 |
Physical Properties
The following table shows the physical properties of nickel alloy 188.
|
Properties |
Metric |
Imperial |
|
Density |
9.14 g/cm3 |
0.330 lb/in3 |
|
Melting point |
1300-1330°C |
2370-2430°F |
Mechanical Properties
The mechanical properties of nickel alloy 188 are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength (annealed) |
963 MPa |
140000 psi |
|
Yield strength (annealed) |
446 MPa |
64700 psi |
|
Elongation at break (annealed) |
55% |
55% |
Thermal Properties
The thermal properties of nickel alloy 188 are given in the following table
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@93°C/199°F) |
11.9 µm/m°C |
6.61 µin/in°F |
|
Thermal conductivity |
12.1 W/mK |
84 BTU.in/hrft².°F |
Other Designations
Other designations that are equivalent to nickel alloy 188 include the following:
-
PWA 1042
-
Werkstoff 2.4683
-
EN 2.4683
-
AMS 5801
-
AMS 5608
Applications
The following are the list of applications of nickel alloy 188:
-
Spray bars
-
Afterburner liners
-
Gas turbine engine combustor cans
-
Flame-holders.