ThePipingMart Blog Grades S3 Tool Steel – Composition, Properties, and Uses

S3 Tool Steel – Composition, Properties, and Uses

S3 Tool Steel

S3 tool steel is a versatile and popular tool steel widely used in various industrial applications. This type of steel is known for its exceptional strength, durability, and ability to withstand high temperatures. If you’re looking for a reliable and high-quality material for your next project, S3 tool steel is what you need. In this blog post, we’ll discuss what S3 tool steel is, its composition, physical and mechanical properties, uses, hardness, and heat treatment process. Let’s dive right in!

S3 Tool Steel Composition

S3 tool steel is a high-speed alloy of carbon, tungsten, and molybdenum. It also contains small amounts of chromium, vanadium, and cobalt. The carbon content typically ranges from 0.85% to 0.95%, while tungsten and molybdenum make up 3.5% and 6%, respectively. These elements enhance the steel’s toughness, wear resistance, and high-temperature strength.

S3 Tool Steel Physical Properties

S3 tool steel has a 7.85 g/cm³ density and a melting point of 1370°C. It is known for its excellent thermal conductivity, which makes it suitable for high-temperature applications. The thermal expansion coefficient of S3 tool steel is relatively low, which helps prevent distortion and cracking during heat treatment processes.

S3 Tool Steel Mechanical Properties

S3 tool steel has outstanding mechanical properties, making it ideal for cutting, drills, and other high-performance tools. The hardness of S3 tool steel ranges from 63 to 65 HRC, depending on the heat treatment process. It has a high modulus of elasticity and ultimate tensile strength, allowing for excellent wear resistance and toughness.

S3 Tool Steel Uses

S3 tool steel is commonly used in manufacturing a wide range of cutting tools, including drills, punches, milling cutters, and reamers. It also makes moulds, machine parts, and other industrial components. S3 tool steel’s high-temperature strength and robustness make it suitable for demanding applications that require high wear resistance, durability, and strength.

S3 Tool Steel Hardness

The hardness of S3 tool steel can be adjusted during heat treatment. The recommended hardness range is between 63 to 65 HRC for optimal performance. A higher Rockwell hardness value may result in improved wear resistance, while a lower value enhances toughness and durability.

S3 Tool Steel Heat Treatment

Heat treatment is necessary to achieve the desired hardness, wear resistance, and toughness. The process involves heating the steel to a specific temperature, holding it there for a duration, and then cooling it down at different rates. The most common heat treatment process for S3 tool steel is annealing, quenching, and tempering. This process improves the steel’s hardness and toughness, preparing it for various applications.


S3 tool steel is a special high-speed steel alloy that offers a unique combination of strength, toughness and wears resistance. Its excellent physical and mechanical properties make it a reliable choice for demanding industrial applications. Whether you need cutting tools, machine parts, or moulds, S3 tool steel is an excellent choice for your next project. We hope this comprehensive guide has given you a better understanding of what S3 tool steel is, its composition, properties, and uses.

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