Steel turning – shorter cutting times with higher process security

Sandvik’s Grade GC4325 brings a new generation coated cemented-carbide grade
for steel turning.

There is a considerable loss in productivity in steel turning due to machine shops holding back on cutting speed with an emphasis on establishing a safe, predictable tool-life. This has been largely due to the performance of tools throughout the broad mid ISO P25 application area. Process security has been a concern because of uneven insert wear development with either careful process supervision or more frequent stopages to change inserts. Cutting speeds have been kept well below any recommended levels.

Predictability has become increasingly important in today’s machining, especially where there is limited supervision in production. There are always a number of threats to the edge line remaining intact long enough in steel turning. One challenge is the breadth of the ISO P25 application area, which includes several very different materials, from ductile low-carbon steels to high-alloy hard steels, bar material to forgings, castings to pre-machined parts. The advances with the new grade, GC4325, will actually help users resist holding back on cutting-data levels. The grade provides extremely high process security through its ability to retain an intact edge line.

This latest innovation in tool material provides a new, higher potential for increasing cutting speeds and a longer, more predictable tool life with very high reliability, over an extended broad ISO P25 application area.

Withstands higher temperatures
The insert substrate and coating of GC4325 have been developed to better withstand high temperatures, thereby reducing the effect that causes excessive wear. As a bonus, the grade is highly capable of maintaining the insert edge line at higher temperatures, which translates into the capability for higher cutting speeds with added security through more predictable, longer tool life.

With GC4325, longer tool-life is achieved through retaining an intact edge-line, which increases machine utilisation through fewer tool changes. The new grade also has the highest recommended cutting data of all P25 grades – and the process security to maintain it. This new grade also gives consistent performance with a minimum need for process-supervision.

With all this in mind an average productivity increase of 30 percent from today’s existing levels is now available. The grade represents a new generation of performance with coated cemented-carbide indexable inserts, providing a new potential to be tapped throughout a large and diversified application area.

Take a closer look at what this new grade has to offer at

For further details contact Sandvik Coromant on TEL: 0860 101 008 or Mary-Ann Germishuys on TEL: 011 570 9615 or email:

GC4325 from Sandvik Coromant addresses the P25 steel turning challenge with increased cutting speeds, longer tool life and higher reliability