Inveio – Uni-directional crystal orientation

​Inveio™ is the technological breakthrough of uni-directional crystal orientation in the alumina coating layer that gives inserts a new level of wear resistance and tool life.

​The material science behind Inveio

In conventional CVD alumina coatings, crystal growth direction is random. When developing Inveio™, our experts found a way to control the growth in this coating layer to ensure that all of the crystals line up in the same direction, with the strongest part toward the top surface. This can be seen in the microscope images below, where each crystal direction is given a unique color.

In 1969, the same year as the first moon landing, Sandvik Coromant introduced the world's first CVD-coated, cemented carbide insert—an ISO P25 grade. Since then, we have continued to lead the way in tool material- and process development. GC4325 is the 7th generation of that grade and is once again a ground-breaking technological breakthrough.

The Inveio effect 

The tightly packed, uni-directional crystals create a strong barrier toward the cutting zone and chip. This greatly improves crater wear and flank wear resistance. Another effect is that heat is more rapidly lead away from the cutting zone, helping the cutting edge stay in shape for longer times in cut.

Predictability and long tool life

Inveio™ has the greatest single effect on the insert strength, wear resistance, and tool duration. The effect of the Inveio coating is combined with all other elements of the insert: the substrate, the shape of the cutting edge, and the post-treatment process. Together, this results in long and predictable tool life.

 

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Insert grades with Inveio

Sandvik Coromant has successfully implemented this coating technology on the following grades:

GC4325 – The First Choice grade for steel turning
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GC4315 – Your option for steel turning with high metal removal rate
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GC4305 – Steel turning efficiency in stable conditions
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GC4335 – Steel turning efficiency under unstable conditions

GC3330 – The First Choice grade for cast iron milling
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GC4334 – Your First Choice insert grade for secure and predictable drilling
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GC2220 – Stainless steel turning in stable conditions

GC4324 – Your productivity choice for drilling in stable conditions
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