Nickel Alloy 188 (UNS R30188)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


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 84².°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


The following are the list of applications of nickel alloy 188:

  • Spray bars
  • Afterburner liners
  • Gas turbine engine combustor cans
  • Flame-holders.

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