Inconel 600 vs Inconel 625 Round Bars

Inconel alloys have become the material of choice for various high-temperature applications thanks to their outstanding features, such as exceptional resistance to corrosion, oxidation, and high-temperature environments. Two of the most popular Inconels are Inconel 600 and Inconel 625. Both of these are from the same family of nickel-chromium alloys and share many similarities but also have distinctive differences. In this blog, we will dive deep into the differences between Inconel 600 and Inconel 625 round bars and which one you should choose based on your application requirements.

What are Inconel 600 Round Bars?

Inconel 600 Round Bars are high-nickel alloy bars made from nickel, chromium and iron. The composition of these bars creates an extraordinarily strong alloy with excellent resistance to corrosion in many different environments, making them ideal for extreme temperature applications such as those found in aerospace engineering or nuclear operations. In addition, these round bars boast superior tensile strength and oxidation resistance properties compared to most other alloys available today. They also offer excellent formability, weldability and machinability without sacrificing their strength. This makes them an ideal choice for projects cost-effectively requiring high-quality results.

What is Inconel 625 Round Bars?

Inconel 625 Round Bars are essential components used in many high-temperature applications. The alloy is made from a nickel-chromium-based superalloy and provides outstanding oxidation and corrosion resistance, which makes it very suitable for extreme environments. Inconel 625 also has extremely good fatigue strength and excellent mechanical properties, allowing it to withstand even the toughest conditions. Additionally, its weldability features make Inconel 625 Round Bars perfect for use in many industries, such as aerospace, oil & gas extraction and chemical processing equipment. This material offers superior quality, so industrialists and individual customers highly seek it!

Composition and Properties

Inconel 600 is a nickel-chromium alloy that contains around 76% nickel, 15% chromium, and 8% iron. It has excellent resistance to corrosion and high-temperature environments but does not perform well in a high chloride environment. It is commonly used in chemical processing, heat treating, and aerospace industries.

On the other hand, Inconel 625 is a nickel-chromium-molybdenum alloy with unique properties such as excellent oxidation resistance and high strength at elevated temperatures. It contains around 58% nickel, 20-23% chromium, and 8-10% molybdenum. Inconel 625 is primarily used in petrochemical processing, aerospace, and marine engineering industries.

Resistance to Corrosion and Oxidation

Inconel 600 has good resistance to corrosion in high-temperature environments, but it is better than Inconel 625 in a high chloride environment. Inconel 625 is immune to chloride stress-corrosion cracking and pitting, making it the ideal choice for applications in harsh marine environments.

Regarding oxidation resistance, Inconel 625 has surpassed Inconel 600 as it has higher chromium and molybdenum content and performs better even in extreme temperatures.

Weldability and Fabrication

Inconel 625 is easier to weld and fabricate than Inconel 600. The latter requires special welding techniques and supplies to prevent cracking and warping during welding. Inconel 625 has good weldability and can be welded through several welding methods, such as gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and plasma arc welding (PAW).


Inconel 625 round bars are generally more expensive than Inconel 600 round bars due to their exotic properties and high-performance characteristics.

Overall Application

Both Inconel 600 and Inconel 625 round bars have exceptional properties and can be used in various industrial applications. However, if you need high-strength, high-temperature performance and better corrosion resistance in a harsh environment, then Inconel 625 round bars are the better choice. On the other hand, if you need a more cost-effective option, Inconel 600 round bars can provide good resistance to corrosion and high-temperature environments at a lower cost.


Choosing between Inconel 600 and Inconel 625 round bars ultimately depends on various factors such as application requirements, budget, and environmental conditions. Both of these alloys offer outstanding properties, but Inconel 625 has better resistance to corrosion, oxidation, and weldability. However, Inconel 600 can perform well in high-temperature environments at a lower cost. Regardless of your choice, getting the correct specifications from your supplier is essential to get the most out of your round bars.