Calcium is added during the melt process and reacts with aluminum & silicon oxides,
which are very hard and detrimental to the cutting edge of tools. The calcium envelopes these oxides in
a Mn-Ca complex sulphide layer which neutralizes these abrasive characteristics.
The complex inclusions created by the Calcium addition have a low melting point of about 1100
C. At high cutting speeds with carbide cutting tools, this temperature is easily achieved. Under these conditions,
the Ca-Si complex inclusions melt, providing a lubricating “film” between the cutting tool and the material.
High Cutting Speeds
Higher cutting speeds & feeds
Increased tool life
Better surface finish