The Hoffman Group offers a turning grade for machining steel. The GARANT HB 7010-1 turning grade was developed to achieve wear resistance at the highest cutting speeds, according to the company. For this purpose, the Hoffmann Group has reconstructed the innovative coating of the GARANT HB 7020 that was introduced in summer 2015 so that it now features a P10 gradient carbide that is optimized for continuous high-performance cutting. The GARANT HB 7010-1 is therefore a suitable tool material for continuous cutting, while the GARANT HB 7020 is suitable for lightly interrupted cutting and difficult operating conditions.

A shark's tooth was the inspiration for the Hoffmann Group when developing the GARANT HB70xx product family: a hard and extremely smooth exterior and a ductile interior. The GARANT HB 7010-1 has an extremely hard, wear-resistant and thermo-resistant CVD coating made of aluminum oxide (Al₂0₃) and titanium carbonitride Ti(C,N), which protects the carbide substrate, even at high cutting speeds and process temperatures. The carbide substrate is particularly resistant to plastic deformation, splintering and brittle fracturing as it is extremely ductile. This turning grade therefore reaches a significantly long tool life with continuous cutting and at high cutting speeds.

The coating is particularly resistant thanks to straightened crystal structures. It's extremely smooth surface enables optimal chip evacuation via the insert surface and reduces the friction between the component and the tool material. This lowers the process temperatures.

In contrast to the casing, the core of the indexable insert is ductile. The carbide substrate is graded, which means that it has an increased proportion of titanium nitride (TiN) in the outer layer in order to adapt the thermal expansion coefficient to the coating. As a result, the coating optimally adheres to the substrate and because of the similar thermal expansion coefficient, the coating cannot shear away, even at high process temperatures.