Stellite Alloy (Pure Cobalt)

Stellite Alloy (Pure Cobalt)

Quick look

  • Hardness window: 50–55 HRC—softer on paper but extraordinarily wear resistant thanks to cobalt carbide networks.1,2
  • Toughness: Cobalt matrix rolls instead of shattering, making it forgiving when tips knock into combs.1
  • Corrosion profile: Essentially rust-proof; pure cobalt shrugs off chemical services and humidity with minimal care.1,2
  • Weight/feel: Silky, almost frictionless closing action that veteran barbers prize for “feel” work.1

Why it matters

Stellite predates modern stainless alloys yet still anchors premium shears. Pure cobalt delivers a buttery close and insane corrosion resistance, so barbers who work over colour bowls or perm stations can rely on consistent glide. The trade-off is hardness—you need to respect the edge and service cadence to get the most from it.1,2

Shear pairing & edge compatibility

  • Classic convex and semi-convex barbers’ shears: Silky close aids scissor-over-comb finesse.1
  • Slide-friendly detailers: Edge rolls predictably, keeping slice work controlled on chemically treated hair.1,2

Technique map

  • Chemical-service environments where stainless sometimes stains or pits.
  • Precision dry detailing and barber tapering that rely on tactile feedback instead of brute edge aggression.1
  • Stylists who like to “feel” the cut through light finger pressure.1

Real-world stress tests

  • Edge retention: Despite lower HRC, cobalt carbides hold polish longer than entry stainless—plan 900–1,100 cuts before a pro touch-up.1,2
  • Impact/drop resilience: Tips usually roll gently; specialists can refinish without removing substantial blade length.1
  • Weight & in-hand feel: Minimal resistance; the blades close almost under their own weight, ideal for marathon cutting blocks.1

Maintenance notes

Wipe and oil after every guest—even though rust is rare, residue can glaze the surface. Keep tension neutral and send the shears to a cobalt specialist once or twice a year; Stellite responds best to slow, cool finishing stones.1,2

Industry snapshot

  • Mizutani Stellite Alloy series: Japanese masters rely on pure cobalt blanks to deliver that signature zero-drag close for high-end barber work.1

Trade-offs

  • Lower hardness means aggressive dry slide work can deform the edge faster—stay on top of service.1,2
  • Pure cobalt is brittle if abused; avoid dropping or twisting the blades together.1
  • Specialist sharpening network is small and usually pricier than standard stainless.1

Sources

  1. Sisrma – Cobalt & Stellite Material Guide (Japanese)
  2. Okawa – Pure Cobalt Overview (Japanese)

Related: Extramarise I • Extramarise II • Scissor Maintenance

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