CNC Machining Materials

Tool Steel CNC Machining

Tool steels are metal alloys with extremely high hardness, stiffness and abrasion resistance. Suitable for producing industrial devices.

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Tool Steel CNC Machining

Tool steel is any one of the different carbon steels and alloy steels that are especially well-suited to be made into tooling, consisting of cutting devices, dies, hand tools, blades, and others. Their viability originates from their unique hardness, resistance to abrasion and deformation, and their capability to hold a reducing side at elevated temperature levels. Consequently, tool steels are matched for usage in the shaping of other products, when it comes to instance in cutting, machining, stamping, or creating.

Tool Steel Subtypes

Ultimate tensile strength Yield strength Young’s modulus (modulus of elasticity) Elongation at break Corrosion resistance Magnetism Weldability Application
Tool Steel A2 670 – 710 MPa 345 – 350 MPa 190 GPa 21 % Poor Magnetic Moderate Cutting & Shearing tools Cold-forming dies Die casting and molding dies Learn More
Tool steel A3 700 MPa 340 MPa 190 GPa 21% Poor Magnetic Poor Cold forging & heading dies Cold forging dies Shear blades Knurling tools Learn More
Tool steel D2 758 – 860 MPa 420 – 470 MPa 190 GPa 16% Poor Magnetic Poor Hot forging tools and dies Hot extrusion tools and dies Cold forming dies Learn More
Tool steel O1 640 – 720 MPa 400 MPa 190 GPa 20% Poor Magnetic Poor Cutting tools Cold-forming dies Shearing tools Die casting and molding dies Learn More
Tool steel S7 640 – 670 MPa 370 – 380 MPa 190 GPa 21 – 25 % Poor Magnetic Poor Cutting tools Hot forging & extrusion tools Cold-forming dies Shearing tools Learn More
Tool steel H13 690 MPa 330 MPa 190 GPa 21% Poor Magnetic Poor Extrusion & pressure dies Forging & stamping dies Hot shear blades Learn More

Tool Steel CNC Machining Surface Finishes

Tool Steel CNC Machining Gallery

Cost-saving Design Tips

To lower costs, restrict the number of part setups, the number of inspection dimensions or tight tolerances, and deep pockets with small radii.


There are six groups of tool steels: water-hardening, cold-work, shock-resistant, high-speed, hot-work, and special purpose. The choice of group to select depends on cost, working temperature, required surface hardness, strength, shock resistance, and toughness requirements.[2] The more severe the service condition (higher temperature, abrasiveness, corrosiveness, loading), the higher the alloy content and consequent amount of carbides required for the tool steel.

Tool steels are used for cutting, pressing, extruding, and coining of metals and other materials. Their use in tooling is essential; injection molds for example require tool steels for their resistance to abrasion- an important criterion for mold durability which enables hundreds of thousands of moldings operations over its lifetime.

Yes, heat treatment is often used to optimize the hardness and wear resistance of tool steel components.

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