Choosing the correct carbide insert for stainless steel is the first step to stable CNC production.
Compared with carbon steel, stainless steel has high toughness and work-hardening properties, so the insert must have a sharp geometry and a wear-resistant coating at the same time.
A common choice is the CNMG120408 insert with a PVD AlTiN coating; the 80° nose angle provides good edge strength, while the coating reduces built-up edge at medium-low speed.
When the cutting depth is 1–2 mm, pairing this insert with a 0.2 mm/rev feed gives an average tool life of 45 min, 25 % longer than uncoated types.
Operators should also keep the coolant concentration at 8 % to avoid thermal cracks.
For more options, visit www.cutoutiltools.com and search "carbide insert for stainless steel".
