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Steel milling

The machinability of steel differs, depending on alloying elements, heat treatment and manufacturing process (forged, cast, etc.)

Main issues

  • In soft, low carbon steels, built-up edge and burr formation on the workpiece are the main issues.
  • In harder steels, the positioning of the cutter becomes more important to avoid edge chipping.

Suitable cutters and inserts

  • Most CoroMill cutters are well suited for steel machining with a comprehensive assortment of insert grades and geometries.
  • Note, that CoroMill Century (with steel body) and CoroMill 790, originally developed for aluminium, also perform very well in finishing steel.
  • The only tools not suitable for steel are the AUTO-cutters dedicated for grey cast iron.
  • PL, PM, PH and WL, WM, WH geometries
  • The GC4200-series of MT-CVD coated grades are the basic choice. However, for smaller diameter cutters, below Dc 32mm, and for shoulder milling cutters, k=90°, grade GC1030 is the first choice.
  • In harder steels, use GC1030 and GC1010.​


Cutting speed and grade recommendations related to material hardness.

Application hints

Recommendations, such as positioning of the cutter to avoid a large chip thickness on the exit, and to always run dry without cutting fluid, should always be considered, especially in roughing operations.


Grade guideline – face milling


Grade guideline – end milling CoroMill® 490, CoroMill® 390, CoroMill® 316


CoroMill® Plura


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