Granulator Blade Materials: HSS vs Tungsten Carbide vs Tool Steel
Not all granulator blades are made equal. The material your blades are manufactured from directly affects how long they last between grinds, how well they hold an edge, and how much each regrind costs. Here's a practical breakdown of the three most common blade materials.
Tool Steel (D2, H13, O1)
Tool steel is the most common and cost-effective granulator blade material. D2 tool steel offers good wear resistance and is straightforward to regrind. H13 is preferred for high-temperature applications. Tool steel blades are well-suited to standard plastic granulation and offer a good balance of toughness and edge retention. They're the most economical to regrind professionally.
High Speed Steel (HSS — M2, M42)
HSS blades offer superior hardness and edge retention compared to standard tool steel, making them suitable for harder or more abrasive materials. M2 is the workhorse grade; M42 (cobalt HSS) is used for particularly demanding applications. HSS blades hold their edge longer between grinds but require more care during regrinding to avoid overheating the edge.
Tungsten Carbide (TC)
Tungsten carbide blades offer the highest wear resistance of any common blade material — often lasting 5–10x longer than tool steel in abrasive applications. They're ideal for glass-filled plastics, rubber, or highly abrasive materials. The trade-off is brittleness: TC blades are more susceptible to chipping from impact or contamination. Regrinding requires specialist diamond grinding wheels.
Which Material Is Right for Your Application?
For standard plastic granulation: D2 tool steel is the cost-effective choice. For harder or filled materials: HSS M2 offers better longevity. For highly abrasive materials or long production runs: tungsten carbide delivers the best cost-per-hour performance despite higher upfront cost. If you're unsure, contact KMW Blade Grinding Ltd — we can advise based on your specific material and machine.
Regrinding All Three Materials
KMW Blade Grinding Ltd has the specialist equipment to regrind tool steel, HSS and tungsten carbide granulator blades to OEM tolerances. We serve businesses across Yorkshire including Sheffield, Leeds, Huddersfield, York and Hull. Collection and delivery included.