Inconel 625 – Composition, Properties and Applications of Inconel 625 Nickel-Chromium-Molybdenum Alloy by Alloy Wire International

Topics Covered


Inconel 625 – Nickel-Chromium-Molybdenum Alloy

Chemical Composition of Inconel 625

Typical Properties of Inconel 625

Properties of Supplied Materials and Heat Treated Materials

Relevant Standards

Equivalent Materials

Applications of Inconel 625


Alloy Wire International Ltd. is a U.K. wire manufacturer specialising in the production of high performance alloys, mainly Nickel Alloys, but including Cobalt and Titanium Alloys.

These alloys might be used in any environment that requires resistance to heat and corrosion but where the mechanical properties of the metal must be retained.

Inconel 625 – Nickel-Chromium-Molybdenum Alloy

Inconel 625 is a Nickel-Chromium-Molybdenum alloy with excellent corrosion resistance in a wide range of corrosive media, being especially resistant to pitting and crevice corrosion. It is a favourable choice for sea water applications.

Chemical Composition of Inconel 625

The compositional range for Inconel 625 is provided in the table below.




58% min


20 - 23%


8 - 10%


3.15 - 4.15%


5% max

Typical Properties of Inconel 625

Typical properties of Inconel 625 are covered in the following table.





8.44 g/cm3

0.305 lb/in3

Melting point

1350 °C

2460 °F

Co-Efficient of Expansion

12.8 μm/m.°C


7.1x10-6 in/in.°F


Modulus of rigidity

79 kN/mm2

11458 ksi

Modulus of elasticity

205.8 kN/mm2

29849 ksi

Properties of Supplied Materials and Heat Treated Materials

Condition of Supply

Heat Treatment (After Forming)

Annealed/Spring Temper

Stress relieve at 260 - 370°C (500 - 700°F) for 30 - 60 minutes and air cool.


Approx Tensile Strength

Approx Service Temp.


800 - 1000 N/mm2

116 - 145 ksi

-200 to +340°C

-330 to +645°F

Spring Temper

1300 - 1600 N/mm2

189 - 232 ksi

up to +200°C

up to +395°F

Relevant Standards

Inconel 625 is covered by the following standards:

         BS 3076 NA 21

         ASTM B446

         AMS 5666

Equivalent Materials

Inconel 625 is the tradename of Special Metals Group of Companies and equivalent to:

         W.NR 2.4856

         UNS N06625

         AWS 012

Applications of Inconel 625

Inconel 625 typically finds application in:


         Aerospace industries

         Chemical processing

         Nuclear reactors

         Pollution control equipment



Source: Alloy Wire International


For more information on this source please visit Alloy Wire International.


Date Added: May 2, 2008 | Updated: Jun 11, 2013
  1. William Vanek William Vanek United States says:

    No question; just a comment.  Inconel 625 also has good fatigue resistance.  I once had a 304 stainless steel shaft that would break yearly.  I replaced it with Inconel 625 and it has run for 10 years and counting.  Good stuff.

  2. Jorge Calderon Cota Jorge Calderon Cota Mexico says:

    I have a question, I am writing my MSC thesis from precipitates in Inconel 625, can someone tell me the precipitate temperatures from this alloy or at least some info for precipitation thanks in advance please.

  3. vinod kumar sharma vinod kumar sharma India says:

    what is the forging temperature of inconel 625 ?  plz suggest.

  4. Priyadarshika Nayak Priyadarshika Nayak India says:

    molar mass of inconel 600

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of
Ask A Question

Do you have a question you'd like to ask regarding this article?

Leave your feedback