{"id":18602,"date":"2026-05-15T12:44:18","date_gmt":"2026-05-15T12:44:18","guid":{"rendered":"https:\/\/haynesintl.com\/?page_id=18602"},"modified":"2026-05-15T13:20:40","modified_gmt":"2026-05-15T13:20:40","slug":"alloy-groups","status":"publish","type":"page","link":"https:\/\/haynesintl.com\/en\/corrosion-guide\/alloy-groups\/","title":{"rendered":"Alloy Groups"},"content":{"rendered":"\n
\n

Nickel Alloy Groups<\/h2>\n\n\n\n

There are many commercially-available, wrought, corrosion-resistant, nickel-based alloys. To understand their characteristics and metallurgy, it is convenient to group them compositionally. The main groups, as defined by alloying elements present at levels of 10 wt.% or above, are as follows:<\/p>\n\n\n\n

    \n
  1. Commercially-Pure Nickel (Ni)<\/li>\n\n\n\n
  2. Nickel-Copper (Ni-Cu)<\/li>\n\n\n\n
  3. Nickel-Chromium (Ni-Cr)<\/li>\n\n\n\n
  4. Nickel-Molybdenum (Ni-Mo)<\/li>\n\n\n\n
  5. Nickel-Chromium-Molybdenum (Ni-Cr-Mo)<\/li>\n\n\n\n
  6. Nickel-Chromium-Iron (Ni-Cr-Fe)<\/li>\n\n\n\n
  7. Nickel-Iron-Chromium (Ni-Fe-Cr)<\/li>\n<\/ol>\n\n\n\n

    The general attributes of each group are listed in the following table, along with the names of some representative alloys:<\/p>\n\n\n\n

    \n
    \n \n\n \n \n \n \n \n \n \n \n
    \n Group <\/td>\n \n Examples <\/td>\n \n Attributes <\/td>\n <\/tr>\n
    \n C-P Nickel <\/td>\n \n Nickel 200 alloy <\/td>\n \n Very resistant to caustic alkalis. Useful electrical and magnetic properties. <\/td>\n <\/tr>\n
    \n Ni-Cu <\/td>\n \n MONEL\u00ae<\/sup>\u00a0alloy 400 alloy <\/td>\n \n Very resistant to seawater and hydrofluoric acid. Moderately resistant to sulfuric acid. Very resistant to oxidizing acid solutions. <\/td>\n <\/tr>\n
    \n Ni-Cr <\/td>\n \n HASTELLOY\u00ae<\/sup>\u00a0G-35\u00ae<\/sup>\u00a0alloy <\/td>\n <\/tr>\n
    \n Ni-Mo <\/td>\n \n HASTELLOY\u00ae<\/sup>\u00a0B-3\u00ae<\/sup>\u00a0alloy <\/td>\n \n Very resistant to hydrochloric acid and sulfuric acid. <\/td>\n <\/tr>\n
    \n Ni-Cr-Mo <\/td>\n \n HASTELLOY\u00ae<\/sup>\u00a0C-276 alloy <\/td>\n \n Resistant to both oxidizing and reducing acid solutions. Very resistant to chloride-induced pitting, crevice attack and stress corrosion cracking. <\/td>\n <\/tr>\n
    \n Ni-Cr-Fe <\/td>\n \n HASTELLOY\u00ae<\/sup>\u00a0G-30\u00ae<\/sup>\u00a0alloy <\/td>\n \n Very resistant to oxidizing solutions. Moderately resistant to chloride-induced pitting, crevice attack and stress corrosion cracking. <\/td>\n <\/tr>\n
    \n Ni-Fe-Cr <\/td>\n \n INCOLOY\u00ae<\/sup>\u00a0alloy 825 <\/td>\n \n Resistant to oxidizing solutions. Some resistance to sulfuric acid and chloride-induced localized attack. <\/td>\n <\/tr>\n <\/table>\n<\/div>