Inconel 601 vs 625: A Comprehensive Comparison

Inconel, a superalloy comprising primarily of nickel, exhibits exceptional corrosion resistance, heat resistance, and strength. It finds extensive usage in extreme-heat conditions, making it exceptionally popular for furnace applications such as heat treating or annealing steel. Two widely used alloys in the Inconel family are Inconel 601 and Inconel 625. This article offers a comprehensive comparison of these two alloys to help you identify the best choice for your specific application.


Inconel 601 and Inconel 625 are solid solution strengthened superalloys, renowned for their high-temperature properties. Both alloys share similarities in their corrosion resistance and strength, but they also exhibit distinct characteristics due to their unique chemical compositions. This article compares these two alloys from multiple perspectives to help you make an informed decision for your project.

Basic Information

Inconel 601 and Inconel 625 are both high-temperature, solid solution strengthened alloys. However, their chemical compositions differ, leading to varying corrosion resistance and strength characteristics.

Inconel 601

Inconel 601, also known as UNS N06601 or W.Nr. 2.4851, is a solid solution strengthened alloy with a density of 8.11 g/cm³. It is well-suited for high-temperature applications.

Inconel 625

Inconel 625, identified as UNS N06625 or W.Nr. 2.4856, is a nickel-chromium-molybdenum-niobium alloy. It is also a solid solution strengthened alloy with a density of 8.44 g/cm³ and is designed for use in high-temperature environments.


Inconel 601

Inconel 601, a nickel-chromium-iron alloy, is known for its resistance to corrosion and heat. It presents an excellent combination of high strength and good workability, making it a standard engineering material for various applications.

Inconel 625

On the other hand, Inconel 625, a nickel-chromium alloy, is utilized for its high strength, outstanding fabricability, and excellent corrosion resistance. It can operate in temperatures ranging from cryogenic to 1800°F (982°C).

Chemical Composition

The chemical compositions of Inconel 601 and 625 contribute significantly to their distinct properties.

Inconel 601

Inconel 601 consists of 58-63% nickel, 21-25% chromium, and 1.0-1.7% aluminum. Other elements include carbon, sulfur, silicon, manganese, and copper.

Inconel 625

Inconel 625 is composed of 58% nickel, 20-23% chromium, 8-10% molybdenum, and 3.15-4.15% niobium. It also contains traces of iron, carbon, manganese, silicon, aluminum, titanium, phosphorous, and sulfur.


The purity of an alloy, primarily determined by its impurity content, impacts its performance. Inconel 625 has stricter controls on impurity elements like phosphorus and manganese compared to Inconel 601, resulting in better performance due to higher purity.

Corrosion Resistance

Nickel, present in both Inconel 600 and 625, plays a significant role in enhancing corrosion resistance. However, Inconel 625, with its higher chromium content, shows better corrosion resistance, especially in oxidizing environments.

Mechanical Behavior

The mechanical behavior of an alloy depends on its composition and structure. Inconel 625, with its molybdenum, niobium, tantalum, aluminum, and titanium content, exhibits improved mechanical properties compared to Inconel 601.

Physical Properties

The physical properties of Inconel 601 and 625, such as density, melting range, permeability, and curie temperature, are critical for their performance in various applications.


The stronger and more corrosion-resistant Inconel 625 finds a wider range of applications than Inconel 601. These include use in chemical processing, nuclear power plants, and oil and gas industries.

Supported Products

Inconel 601 and 625 are used to manufacture a range of products, from seamless pipes and tubes to rods, bars, and forgings, according to various ASTM standards.


Inconel 625, with its more complex composition and superior performance, is generally more expensive than Inconel 601. However, if Inconel 601 meets your project requirements, it can be a more cost-effective choice.


Inconel 601 and 625 are both high-performance superalloys, each with its unique properties and applications. While Inconel 625 exhibits superior corrosion resistance and mechanical properties, Inconel 601’s wider applications and lower cost make it a popular choice. Ultimately, the choice between these two depends on your specific project requirements.

In this article, we have compared the two alloys in terms of their basic information, introduction, chemical composition, purity, corrosion resistance, mechanical behavior, physical properties, applications, supported products, and price. We hope this comparison helps you make an informed decision for your project.

PropertyInconel 601Inconel 625
Density (g/cm³)8.118.44
Melting Range (°F)2480-25712350-2460
Nickel Content (%)58-6358
Corrosion ResistanceGoodExcellent
Mechanical BehaviorGoodBetter
ApplicationLimitedWider Range

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