Alloy 625 (Inconel®)

Nickel Alloys

Alloy 625 (Inconel®)

Alloy 625 (Inconel®*) is a nickel-chromium-molybdenum alloy with a small niobium and tantalum addition. It is an excellent general purpose material for elevated temperature use in high strength, oxidation problem areas and finds particular application in the aerospace and offshore oil & gas industries. Alloy 625 shows excellent resistance to a variety of corrosive media.

Alloy 625 demonstrates excellent resistance to pitting, crevice corrosion, stress corrosion, corrosion fatigue and erosion corrosion whilst maintaining its mechanical properties up to about 450 ºC. It is highly resistant to a wide range of organic and mineral acids combined with good corrosion resistance to high temperature sulphides and chlorides. The niobium and tantalum within the matrix act in conjunction with the molybdenum to provide a high strength alloy without the need for additional heat treatment.

Related Specifications of Alloy 625 (Inconel®*)

  • NA21
  • N06625
  • NACE MR 0175
  • ISO 15156-3
  • AMS 5666
  • ASTM B446
  • 2.4856
  • NiCr22Mo9Nb (EU)

Nominal Composition of Alloy 625 (Inconel®*)

Ni 61.0%, Cr 21.5%, Mo 9.0%, Nb & Ta 3.6%

Mechanical Properties of Alloy 625 (Inconel®*)

Ultimate Tensile Strength (N/mm²) Proof Stress (N/mm²) Elongation (%) Hardness (HB)
690 275 30

Key Features of Alloy 625 (Inconel®*)

  • Strength retained up to 450ºC
  • Very good resistance to corrosion fatigue
  • High pitting, crevice and stress corrosion resistance
  • Excellent oxidation resistance

Applications of Alloy 625 (Inconel®*)

Offshore & marine | Components where exposure to sea water and high mechanical stresses are required; oil and gas production where hydrogen sulphide and elementary sulphur exist at temperature in excess of 150C; flare stacks; hydrocarbon processing from tar-sand and oil-shale recovery projects

Chemical processing | Flue gas desulphurisation plant, flare stacks, offshore sour oil and gas production, waste incineration, phosphoric acid production and nuclear fuel processing

Columbia Metals – a leading supplier of Alloy 625 (Inconel®*)

With decades of experience and a huge range of stock, Columbia Metals is an industry leader in the supply of Alloy 625 (Inconel®*) and other high quality specialist engineering alloys.

To buy or learn more about Alloy 625 (Inconel®*) contact us now, or fill in the enquiry form on the right hand side and we will be in touch shortly.

  Related Specifications Mechanical Properties
Alloy Name BS UNS BS EN Others Ultimate Tensile Strength N/mm² Minimum Yield Strength N/mm² Elongation % Hardness HB  
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