Alloy 188 Cobalt Sheet, Coil & Bar - AMS 5608, 5772

Udimet Alloy® 188 is a cobalt-base austenitic alloy with excellent high temperature strength and good oxidation resistance to 2000°F (1093°C). The high chromium level coupled with small additions of lanthanum produce an extremely tenacious and protective scale. The alloy also has good sulfidation resistance and excellent metallurgical stability displayed by its good ductility after prolonged exposure to elevated temperatures. 

Alloy 188 is non-magnetic. It has good high temperature strength up to 1800ºF (982°C) and good oxidation resistance up to 2100ºF (1149°C). This alloy performs well in continuous high temperature service and has excellent oxidation, spalling and corrosion resistance, achieved through the addition of chromium in combination with a minute amount of lanthanum. The lanthanum addition produces a tenacious, protective oxide scale at high temperatures. This alloy also maintains its ductility at cryogenic temperatures but strength levels are increased substantially. 


188 Inventory Size Ranges

Sheet & Coil

0.020"- 0.083"

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Bar

0.375" - 4.000"

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Standard Inventory Specifications

  • UNS R30188
  • AMS 5608
  • AMS 5772
  • B50TF74

Other industry standards we comply with:

  • PWA-LCS
  • S1000 / S-SPEC-1
  • GE Aviation S-SPEC-35 AeDMS S-400
  • RR SABRe Edition 2
  • DFARS Compliant

Common Trade Names

  • Udimet Alloy 188 (® Special Metals )
  • Haynes 188 Alloy (® Haynes International)
  • ATI 188 (™ Allegheny Technologies)

Common Applications of 188

  • Gas turbine operations
  • Combusters
  • Flame holders
  • Liners
  • Transition ducts
  • Exhaust frames
Alloy 188 Chemical Composition
Element Percent by Weight
C Carbon 0.05 - 0.15%
Mn Manganese 1.25% max
Si Silicon 0.20 - 0.50%
Cr Chromium 20.0 - 24.0%
Ni Nickel 20.0 - 24.0%
W Tungsten 13.0 - 16.0%
La Lanthanum 0.02 - 0.12%
B Boron 0.015% max
Fe Iron 3% max
Co Cobalt Balance

Alloy 188 Physical Properties

   
 Density  0.330 lb/in³   9.14 g/cm³
 Melting Range  2375-2425 °F   1300-1330 °C
Specific Heat  0.097 at  70 °F, Bru/lb °F   405 at 21 °C, J/kg °C
Permeability  1.0007 at 200 oersted
Coefficient of Expansion  6.6 0-200 °F, 10¯⁶ in/in●°F
Thermal conductivity  84 Btu●in/ft²●h●°F   W/wm●°C
Electrical Resistivity 613 ohm●circ mil/ft   102.0 microhm-cm

 

Mechanical Properties and Yield Strength of Alloy 188 

Yield Strength

Tensile Strength

Elongation

ksi

MPa

ksi

MPa

%

65

446

140

963

55


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The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.