Inconel Alloy 625 Piping

Inconel is a registered trade name of Special Metal Alloys Corporation.

Inconel alloy 625(UNS 06625/W.Nr.: 2.4856) is a nickel-chromium-molybdenum alloy with an addition of niobium that acts with the molybdenum to stiffen the alloy’s matrix and thereby provide high strength without a strengthening heat treatment. The alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion.

The high molybdenum content makes this alloy very resistant to pitting and crevice corrosion, and niobium acts to stabilize the alloy against sensitization during welding, thereby preventing subsequent intergranular cracking. Also, the high nickel content provides freedom from chloride ion stress-corrosion cracking.

The outstanding and versatile corrosion resistance of INCONEL alloy 625 under a wide range of temperatures and pressures is a primary reason for its wide acceptance in the chemical processing field.

It is used in sour hydrocarbon, high pressure and high temperature applications. Where production gas is sour and wet containing chlorides, Inconel 625 is a suitable material for this application.

Following is a typical specification for class 1500 Inconel Alloy 625 piping 226 barg @ 103° C.

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