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Inserts Support Both Unmanned Production and Custom Components

Sandvik Coromant uses a second-generation chemical vapor deposition (CVD) alumina coating to produce two turning grades – GC4415 and GC4425 – that withstand the extreme temperatures of P25 cutting zones during continuous operations.

Posted: November 30, 2020

Designed for the broad range of applications possible with P15 through P25 steel grades, Sandvik Coromant’s GC4425 and GC4415 carbide inserts accommodate both continuous and interrupted cuts. The company’s reformulated chemical vapor deposition (CVD) alumina coating (Al2O3) helps extend tool life 80%.

Predictable tool wear is especially important when there’s limited supervision in production turning. GC4415 and GC4425 carbide inserts from Sandvik Coromant (Fair Lawn, NJ) enable high-performance lights-out machining by reducing insert changes.

Grade GC4425 provides improved wear resistance, heat resistance and toughness, significantly expanding the application range for steel grades P15 through P25. When even more heat resistance is required, GC4415 allows for high cutting speeds and long times when machining in stable conditions. Both resist flank wear, crater wear, and edge buildup using a layer of Inveio, the company’s second-generation chemical vapor deposition (CVD) alumina coating (Al2O3).

Each insert comprises four layers:

  • Cemented-carbide substrate balanced for high strength and toughness, with a cobalt-enriched surface gradient to enhance process security.
  • Medium-temperature titanium carbo-nitride (MT-TiCN) for better resistance against abrasive wear.
  • Enhanced Inveio alumina coating with every crystal aligned in the same direction. This creates a strong barrier toward the cutting zone, which extends tool life by significantly increasing wear resistance.
  • A bright yellow titanium nitride (TiN) top coat for easy wear detection.

The GC4425 had to be replaced after 270 workpieces compared to the competition’s 150 workpieces, an 80% increase in tool life.


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