8620 Steel vs 4130 Steel – What’s the Difference

8620 Steel vs 4130 Steel

Have you ever wondered the differences between the most commonly used steel alloys, 8620 Steel and 4130 Steel? They are great materials for various applications, but how do they differ? In this blog post, we will explore the differences between 8620 Steel and 4130 Steel, providing you with all the information you need to know.

Difference Between 8620 Steel and 4130 Steel

Chemical Composition:

The chemical composition of the two steel alloys is quite different. 4130 Steel is an alloy made of Chromium and Molybdenum, while 8620 Steel is made of Nickel, Chromium, and Molybdenum. This composition difference gives both materials unique properties, making them suitable for different applications.

Tensile Strength: 

Tensile strength refers to a material’s ability to resist breaking under tension. 8620 Steel has a higher tensile strength than 4130 Steel. 8620 Steel has a tensile strength of around 95,000 psi, while the tensile strength of 4130 Steel is around 85,000 psi. Therefore, 8620 Steel is a better choice when selecting a material that requires strength and durability.

Hardness:

The hardness of a material is how resistant it is to surface deformations such as scratching, indentation or wear. 4130 Steel has a hardness rating of 217 on the Brinell scale, while 8620 Steel has a hardness rating of 248 – an almost 14 per cent increase over 4130. This hardness difference is a significant consideration when choosing between the two materials.

Weldability:

Weldability refers to how easily two pieces of material can be joined together with minimal defects or weaknesses. 4130 Steel has better weldability than 8620 Steel due to its low carbon content. Welding 8620 Steel can cause cracking, porosity and brittleness, while welding 4130 Steel is more straightforward.

Cost:

Cost is an important factor in determining the selection of materials. In most cases, 4130 Steel is cheaper than 8620 Steel, making it a more cost-effective choice for applications that do not require high tensile strength or hardness. Although 8620 Steel is more expensive, it is a choice often made where strength and durability are required, and cost is not a primary factor.

Conclusion:

In conclusion, though 8620 Steel and 4130 Steel are alloys commonly used in different applications, understanding the differences between the two helps to make the right decision when choosing the material for your application. We have explored their chemical composition, tensile strength, hardness, weldability, and cost differences. Depending on the project’s requirements, one material may be better. With this knowledge, you can choose the best material for your needs.

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