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Kennametal EDM Blocks

Our globally renowned portfolio of grades for metalforming and stamping is based on over 80 years of research and development of tungsten carbide-based materials. 

We have a large selection of conventional and low-corrosion rectangular blanks in stock. Each is sinter-HIP processed and stress-relieved for optimum performance in EDM machining. Blocks are available in standard sizes, which are individually packaged for easy delivery and handling. 

EDM Blocks Portfolio:

  • All grades are proven in their application.
  • Products stocked globally for quick delivery
  • Standard and corrosion-resistant grades
  • 200 standard sizes with custom sizes available upon request
  • Application, metallurgical, and process optimization services
Blanks in Boxes

         

Withstand Extensive EDM

Our latest grades were developed with a proprietary binder system and maintain the hardness and mechanical properties of our conventional grades. They resist the corrosion, pitting, and cracking commonly experienced during electrical discharge machining, especially in thick punches and large die segments. 

Cemented Tungsten Carbide Grades

We offer a wide variety of carbide grades, including submicron, fine, medium, and coarse-grained tungsten carbides with a mixture of binders and additives to create the right balance of hardness, toughness, abrasion, and corrosion resistance for the application.

Hardness: Hardness is determined by the percentage of binder and the grain size of the tungsten carbide particles. Generally, the more binder, the lower the hardness, and the larger the grains, the lower the hardness.

Wear Resistance: Generally, grades with more binder or coarser grains (lower hardness) will have less wear or abrasion resistance. However, there will be an increase in strength. It is always necessary to balance high hardness/high wear resistance with lower hardness/high strength. To test the abrasion or wear resistance of our carbide grades, we typically conduct a dry sand (G65) or slurry tests (B611).

Strength: The amount of binder and the variation in grain size will also affect the impact strength (a shock load) and the fracture toughness (a measure of crack initiation and crack propagation). More binder and/or coarser grains will generally increase the impact strength and the fracture toughness. With submicron grained grades, impact strength and the fracture toughness decrease when compared to coarser grained grades of equal cobalt content; however hardness increases. 

cemented carbide with medium-coarse grains

EDM Blocks Grade Descriptions

Unlike other carbide manufacturers, we produce our powders from the raw materials. This guarantees the highest quality tungsten carbide throughout the process and maximizes performance for the end user. 

Corrosion Resistant Binder Grades Optimized for the Wire EDM Process

Cobalt Binder Grades Optimized for the Wire EDM Process

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EDM Blocks Brochure

Check out our brochure for additional information on EDM Blocks.

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    EDM Block • KMSB • 105mm x 105mm

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    (28)EDM Block • KMFA • 56mm x 120mm

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