8620 Steel vs 4320 Steel – What’s the Difference

8620 Steel vs 4320 Steel

Steel is used extensively for manufacturing various products because of its durability, strength, and resistance to corrosion. However, not all types of steel are created equal. Two commonly used types, 8620 steel and 4320 steel, have similarities in chemical composition but significant differences in their mechanical and physical properties. In this blog post, we will explore the differences between these two types of steel and help you understand which one you should use for your manufacturing needs.

Difference Between 8620 Steel and 4320 Steel

Chemical Composition

The first point of differentiation between 8620 steel and 4320 steel is their chemical composition. Both types of steel contain a similar amount of carbon, but 8620 steel has slightly more nickel and chromium than 4320 steel. The extra nickel and chromium in 8620 steel give it additional strength and toughness compared to 4320 steel.

Mechanical Properties

The mechanical properties of steel are critical for determining its suitability for a particular application. 8620 steel is known for its high strength, toughness, and wear resistance, making it ideal for gears, bearings, and other heavy-duty applications. On the other hand, 4320 steel has lower strength and toughness compared to 8620 steel, which makes it better suited for less demanding applications such as shafts and axles.

Heat Treatment

Both 8620 and 4320 steel can be hardened by heat treatment, which involves heating the steel to a certain temperature and then rapidly cooling it to increase its strength. However, 8620 steel is more amenable to heat treatment than 4320 steel and can achieve higher hardness and toughness. This makes it more suitable for applications where high wear resistance is required.

Machinability

Another important factor to consider is the machinability of the steel, which is its ability to be worked on by machine tools. In general, 8620 steel is slightly easier to machine than 4320 steel, although both types can be challenging due to their high hardness.

Cost

Finally, cost is crucial when choosing between 8620 steel and 4320 steel. Generally speaking, 4320 steel is less expensive than 8620 steel, but this comes at the expense of its lower strength, toughness, and wear resistance. If the application requires high reliability and durability, it may be worth the added expense of using 8620 steel.

Conclusion:

In conclusion, both 8620 steel and 4320 steel are useful for various manufacturing purposes. They have a similar chemical composition but significant differences in their mechanical and physical properties. If you need steel ideal for heavy-duty applications requiring high strength, toughness, and wear resistance, 8620 steel is the better choice. However, if you want low-cost steel for less demanding applications, 4320 steel is a better option. Ultimately, the choice between these two types of steel will depend on your specific application requirements.

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