In article , Daniel A. Mitchell says...

The advantages of the carbides are that they stay sharp longer than a
HSS bit in the same service. I find this especially advantageous in
turning soft but abrasive plastics. It is also useful when one has to
turn hard materials. The inserts work reasonably well with almost all
materials, but there is no advantage when turning softer steels, brass, etc.

And this niche is exactly why carbide can be used to advantage
in the home shop. Abrasive, and hard material cutting.

Jim

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