Every tire that enters your shredder contains steel wire at 15–23% of its weight. That wire is what destroys blades — not the rubber. Your blade strategy must be built around it.
Primary shredders need maximum toughness: thick-section blades in H13 or hot-work steels, hardness sacrificed to 48–52 HRC so edges dent rather than chip on bead wire. Four-shaft machines allow slower rotor speed, which reduces both wire wrap and edge damage.
Granulators (10–30 mm output) can run harder steels, 54–58 HRC, because wire is already liberated. Here blade gap setting matters as much as blade quality — 0.2 mm of drift doubles power draw and halves blade life.
Regrind cadence: most plants sharpen too late. Schedule regrinds at 60–70% of observed edge life; running to failure multiplies both energy cost and catastrophic chipping risk.
We supply matched blade sets with hardness certificates and pre-set factory clearances. For high-wire tire streams, we also offer special edge prep that relocates the cutting zone away from the hottest chip zone.