Sumitomo Electric Carbide Inc. has expanded is best-selling AC400K Series for cast iron turning to include new finishing and general-purpose grades.

The addition of the AC405K and the AC415K grades rounds out Sumitomo's turning options for every cast iron application. The AC405K grade offers excellent wear and deformation resistance for finishing grey cast iron at continuous, high speeds. The general-purpose AC415K grade provides stable turning in a wide range of grey and ductile cast iron applications. Sumitomo's original AC420K grade features excellent fracture resistance that produces extremely stable conditions when performing interrupted or unstable turning, according to the company.

The AC400K Series utilizes the EGZ chipbreaker for general purpose grooving. This carbide cutting series features Super FF Coating and a special surface treatment that strengthens the fine Alumina layer of the insert to provide excellent reliability. This newly developed coating provides 1.5 times longer tool life than conventional tools.