Alloy 188 is a cobalt base superalloy with a unique combination of high temperature strength and oxidation resistance, along with adequate ductility after prolonged exposure to the 1400-1600°F temperature range.

Cobalt alloys have an inherent advantage over the nickel base grades in high temperature creep. Alloy 188 is solid solution strengthened by a 14% tungsten addition, and further by M6C and M23C6 carbides. Alloy 188 is readily fabricated, being welded by both manual and automatic methods including electron beam, gas tungsten arc and resistance welding.


188 Sheet

Common Trade Names

Alloy 188


  • Strength and oxidation resistant to 2000°F
  • Good post-aging ductility
  • Resistant to sulfate deposit hot corrosion


  • Gas turbine engine combustor cans, spray bars, flame-holders and afterburner liners