CNC machining materials: SK5 steel
SK5 is a high-carbon steel, part of the Japanese JIS classification system. It is used in many applications to make tools and machine parts due to its requirement for a mixture of high hardness and wear resistance. SK5 Steel Attributes. Similar to other high-carbon steels, SK5 shares some identical characteristics but comes with certain advantages over them due to its special chemical composition and heat treatment properties. Herein, an in-depth review of the SK5 steel as a CNC machining material follows.
Properties of SK5 Steel
Carbon Content: SK5 steel contains carbon content of about 0.8% to 0.9%. This high carbon content contributes to its hardness and strength but also makes it more brittle compared with lower-carbon steels.
Hardness: After heat treatment, SK5 steel can be very hard—approximately 58-63 HRC—and is, therefore, adapted for cutting tools, blades, and dies. Its hardness allows it to hold sharp edges and resist wear in heavy-duty applications.
Machinability: Although SK5 steel contains good wear resistance, it is subject to getting much harder and therefore more difficult to machine than mild or medium-carbon steels. The higher hardness may demand lower cutting speeds, more powerful machinery, and specialized cutting tools—such as carbide tools—to achieve the desired precision and finish.
Tensile Strength: SK5 steel has high tensile strength and, therefore, can be applied to parts that are subjected to stress and heavy loads. Its strength makes it particularly useful for tools, automotive parts, and manufacturing equipment.
Ductility: SK5 steel offers moderate ductility but usually is less ductile than lower-carbon steels, and more subject to cracking if the material in question is bent or otherwise shocked. Machining needs careful control in order to prevent material defects.
