ST4Best grade for machining stainless steel | Carbide grade for Swiss CNC lathes

Having issues machining stainless steel ? - Problem solved

Exceptional tool life machining difficult stainless steels (304SS) and steels

ST4 inserts solve common machining issues like poor tool life,
dimensional changes, and chips tangling

Product video

Features

  • High hardness and oxidation resistance
  • Outstanding tool life with efficient machining of difficult to cut stainless steels and steels
  • Improved coating bonding force and surface smoothness
    Prevents BUE, common when cutting stainless steels, and achieves stable machining

Tooling application

For stainless steels and steels
Front turning / Back turning / Grooving / ID boring / Cut off

Coating wear and oxidation chart

NTK vs. Competitor (Cut-off edge)

[ Cutting conditions ]
Material : 304SS φ11 Speed=260 SFM feed=.0012" after 200 pcs.

Measurement (Scratch test on coating layer)

NTK's new PVD coating technology improved the bonding force and smoothness on ST4.
It eliminates BUE issues and improves insert performance.

Case study

Medical parts
Material :
SUS630
Cutting speed :
300 SFM
Feed :
.002 IPR
DOC :
.19 inch
Coolant :
WET
ST4
C/T About 1.5 min / part
Conventional tool (PVD carbide)

C/T About 5.0 min / part

TFX series insert in ST4 achieved approximately 3.7 x lower cycle time than that of the competitor's insert.

Pipe part
Material :
304SS
Cutting speed :
200 SFM
Feed :
.0016 IPR
DOC :
.059 inch
Coolant :
WET
ST4

2,000pcs / corner

Conventional tool (PVD carbide)

1000pcs / corner

ST4 increased tool life by 2 x that of the competitor insert.

Machine parts
Material :
SUS316L
Cutting speed :
200 SFM
Feed :
Face turning .0004 IPR
Front turning .0012 IPR
DOC :
.012"- .079"
Coolant :
WET
ST4

6,000pcs / corner

Conventional tool (PVD carbide)

3,500pcs / corner

ST4 increased tool life by about 1.7 times compared to the competition.

Equipment parts
Material :
SUS316L
Cutting speed :
200 SFM
Feed :
.0012 IPR
DOC :
.020"
Coolant :
WET
ST4

4000pcs / corner

Conventional tool (PVD carbide)

2000pcs / corner

ST4 achieved 2 x the tool life of the competitor's insert.

Tool lineup