|Picture 3.14 Grinding a free machining steel component.|
|Free machining steels|
| ||Modern cars contain many steel components with complex shapes. These components are machined into shape using hard, sharp shaping tools. Special free machining steels have been developed that are more readily machined and which prolong the life of the shaping tool.|
|Interrupting the smooth running|
| ||Problems are caused during the shaping of steel components by the tool striking alumina (aluminium oxide) inclusions within the steel. The alumina inclusions are abrasive. They slow down the machining process and damage the cutting edge of the shaping tool.