ThePipingMart Blog Metals 8620 Steel vs 4340 – What’s the Difference

8620 Steel vs 4340 – What’s the Difference

8620 Steel vs 4340

When it comes to engineering, steel is undoubtedly one of the most important materials used. Its strength, durability, and versatility make it valuable in many industrial and manufacturing processes. However, not all steel is created equal, and choosing the right steel for the job can make all the difference in the success of your project. This blog post will compare two popular types of steel – 8620 and 4340 – and help you choose the right steel for your specific needs.

What is 8620?

8620 steel is a low-carbon, nickel-chromium-molybdenum alloy with excellent case hardening properties. This means it can maintain strength and toughness even after exposure to extreme temperatures or surface deformation. It is often used in industrial applications such as gears, valves, and shafts. Aside from its strength, it also has good machinability and weldability, which makes it a popular choice for manufacturing and engineering processes.

What is 4340?

4340 steel is a high-strength, low-alloy steel often used in the aerospace and oil and gas industries. Like 8620, it has excellent hardenability and toughness, making it durable and resistant to wear. It has a relatively low carbon content which provides improved resistance to fatigue and cracking, making it a popular choice for parts that undergo high stress or tension.

Difference Between 8620 Steel and 4340

Strength and durability

8620 and 4340 steel sheets are incredibly strong and durable materials that withstand high pressure and stress. However, when it comes to the ultimate and tensile strength, 4340 steel has the edge. It’s high nickel and chromium content makes it slightly stronger and more corrosion-resistant than 8620. On the other hand, 8620 is more easily machined and welded than 4340, making it a better choice for applications that require a lot of shaping or forming.

Cost and availability

The cost of steel can vary widely depending on the material’s type, quality, and availability. Generally speaking, 8620 steel is more affordable than 4340, making it a more practical option for some applications. However, 4340 steel is more widely available and often used in aerospace applications where quality and durability are necessary.

Choosing the right steel

Ultimately, the choice between 8620 and 4340 steel will depend on the specific needs of your project. Factors like strength, durability, machinability, and availability will all play a role in determining which steel best suits the job. It is important to consult with professionals to make the right choice for your needs.


In conclusion, 8620 and 4340 steel sheets are excellent choices for industrial and manufacturing processes. They are incredibly strong and durable materials that withstand high stress and pressure. When choosing between the two, it is important to consider factors such as cost, availability, and specific application needs. Consulting with professionals in the field is always recommended to ensure that you choose the best steel for your project.

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