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6150 Steel vs S2 – What’s the Difference

6150 Steel vs S2

When it comes to choosing the right type of steel for your project, it can be quite a challenge. So many different types of steel are available in the market, each with unique features, advantages and disadvantages. Two of the most popular types of steel are 6150 Steel and S2. In this blog post, we will closely examine these two types of steel and understand their differences. This will help you decide when to select the right steel for your project.

Difference Between 6150 Steel and S2


6150 steel is an alloy steel that primarily contains chromium and vanadium. It also has a small amount of carbon, manganese, silicon, and molybdenum. This combination of elements gives the steel its high toughness and wear resistance.

On the other hand, S2 steel is considered to be a high-speed tool steel. It is mainly composed of carbon, molybdenum, and silicon. It also has small amounts of tungsten, chromium, and vanadium. Combining these elements gives the steel its hardness, toughness, and resistance to wear and corrosion.

Hardness and Toughness

6150 steel has a hardness rating of 50 to 55 HRC, making it ideal for high-stress applications. However, its toughness is lower compared to some other types of steel. This means it may not be suitable for applications requiring high-impact resistance.

S2 steel, on the other hand, is exceptionally tough and has a high level of hardness. It has a rating of 60 to 62 on the Rockwell C hardness scale. This makes it ideal for use in cutting tools and blades that need to retain a sharp edge for longer periods.

Machinability and Weldability

Machinability and weldability are crucial when selecting steel for use in various applications. 6150 steel has good machinability, so it can easily be shaped and formed to meet specific requirements. However, it is unsuitable for welding, as it can crack and become brittle.

S2 steel also has good machinability and can be easily shaped and formed. However, it is quite difficult to weld, and special precautions must be taken to prevent the material from becoming brittle.

Cost and Availability

Cost and availability are also important considerations when selecting steel for various applications. 6150 steel is readily available and is considered to be an affordable option. It is commonly used in the automotive industry for suspension springs, among other applications.

S2 steel, on the other hand, is quite expensive and may not be readily available in some areas. It is mainly used in cutting tools, knives, and other applications requiring high hardness and toughness levels.


In conclusion, 6150 steel and S2 steel have unique features that make them ideal for various applications. When selecting, it is important to consider factors such as composition, hardness, toughness, machinability, weldability, cost, and availability. By making an informed decision, you can be confident that you have selected the right steel type for your project.

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