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