Inconel® 686

INCONEL® 686 has outstanding resistance to general corrosion, pitting and crevice corrosion, and to stress corrosion cracking. It maintains corrosion resistance in weld beads and in the weld heat affected zone of welds. This alloy has good resistance to mixed acids with pH levels of 1 or less, and chloride levels of over 100,000 ppm.


Inconel® 686 Pipe, Inconel® 686 Plate, Inconel® 686 Sheet

Common Trade Names

Nickel Alloy 686


  • Exceptional resistance to sulfuric or hydrochloric acids, and mixed acids
  • Resists crevice corrosion in hot acid chlorides
  • Practical immunity to chloride stress corrosion cracking
  • Weldments retain high chloride pitting resistance


  • Chemical process vessels
  • FGD scrubbers
  • Pulp bleach plant washers
  • Waste management
  • Weld filler for other high-nickel corrosion alloys