Comparison of INCONEL ALLOY 626 and INCONEL Alloy 725

When you’re looking for a superior material for your next project, a high-performance nickel alloy might be just what you need. However, there are a number of Grades available in the INCONEL range, any of which could suit your requirements and needs.

The flagship INCONEL alloy is INCONEL alloy 625, one of the most versatile materials ever created. With its outstanding corrosion resistance and high strength, it lends itself to a number of applications across a wide range of industries. It’s a hugely popular material of choice that will solve many material problems for design engineers. It’s been doing so for over 50 years now and remains in common usage, which is testament to its quality.

However, if high strength is the priority, INCONEL alloy 725 can be a better fit. It is similar to INCONEL alloy 625, especially in terms of corrosion resistance. However, there are notable differences between the two, which can affect the decision of which to use.

Differences in composition

INCONEL alloy 625 is a nickel-heavy alloy, with a minimum 58% of nickel in the blend withchromium (20-23%) and molybdenum (8-10%), plus added niobium (3.15-4.15%).

The addition of the niobium  and molybdenum gives very high strength in annealed condition without the need for strengthening heat treatment. The  nickel and chromium together give the material its incredible corrosion resistance, withstanding highly corrosive elements and environments.

INCONEL alloy 625  also contains small amounts of cobalt and silver, which are not present in INCONEL alloy 725 which has a higher amount of titanium and balance, as opposed to 5% max in INCONEL alloy 625. These small differences gives INCONEL alloy 725 its hugely increased strength value.

Comparing strength

Whilst INCONEL alloy 625 is a very high strength alloy even co it still outperforms many other nickel alloys in this area.

However, there are applications requiring  higher strength and outstanding corrosion resistance. INCONEL alloy 625 was introduced and marketed as a solid solution strengthened alloy.The addition of titanium in INCONEL alloy 725 fulfils  this requirement

INCONEL alloy 725 is strengthened through heat treatment, not through cold working as INCONEL Alloy 625 and is around  twice the strength of annealed INCONEL alloy 625 it also retains high ductility and toughness.


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Nuclear Reactor Components Valve Stems

If you’re interested in finding out more about INCONEL alloy 625 or INCONEL alloy 725, as well as the rest of our product lines, please get in touch today to speak to an experienced member of our sales team.

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