Inconel 625

Inconel 625 (Alloy 625)

(UNS NO6625)

Alloy 625 is a nickel-chromium-molybdenum-niobium alloy with excellent resistance to a variety of corrosive media. In the soft annealed condition (grade 1), the alloy is used for wet corrosion applications and is approved by TÜV for pressure vessels in a temperature range from -196 to 450 °C (-320 to 842 °F). Alloy 625 is also approved by ASME in both the grade 1 and grade 2 conditions for sections I, III, VIII and XII at temperatures defined in ASME Section IID (temperature limits vary by construction code). For high temperature applications above 600 °C (1,112 °F), the solution annealed variant (grade 2) is generally used. The strength of Alloy 625 can be enhanced by heat treat

Chemical Composition

Physical Properties

Designations & Standards


The soft annealed version of  Alloy 625 (grade 1) is used in the oil and gas industry, the chemical process industry,marine engineering and environmental engineering. Typical applications include:

  • Equipment for the production of super phosphoric acid
  • Plants for the treatment of radioactive waste
  • Production pipe systems and linings of risers in oil production


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