Machining DataSheet for

General Information:
Material GroupP - Steel
Sub-GroupTool Steel
Tensile Strength790 [N/mm^2]
Machinability Range23% - 55%

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Equivalent International Designations for Steel P20

Standard Name
saeP20
wnr1.2311
din40CrMnMo7
bsP20
anfor40CMD8

Chemical Composition for Steel P20

Element Amount
Chromium (Cr)1.40-2.00%
Manganese (Mn)0.60-1.00%
Silicon (Si)0.20-0.80%
Molybdenum (Mo)0.30-0.55%
Carbon (C)0.28-0.40%

Cutting Speeds Recomendations for Tool Steel and High Alloy Steel

* Click on the speeds below for higher precision in specific conditions!

ApplicationVc (m/min)Vc (SFM)
Turning100-240330-790
Milling65-150210-490
Parting50-115160-380
Grooving55-135180-440
Drilling40-95130-310

Important! The speed estimation is given for an ideal situation:

  • Most suitable carbide grade
  • Stable tool clamping
  • Stable workpiece clamping
  • Good quality raw material
  • A short overhang of the cutting tool.
  • Nominal hardness of the material.
  • etc.
Click on the speeds in the above table to get better precision for specific parameters
Or use our Speed and Feed Calculator


Recommended Carbide Grades for Steel P20

* If you do nott understand the below table? Read This Explanation to make the most out of it!

Grade for Turning

Grade for Parting Off

Grade for Grooving

Grade for Milling (Indexable)

Recommended Insert Cutting Edge Geometry for Steel P20

Honing Size:0.05-0.08 mm / 0.002-0.003"
Rake Angle:11° -13°
Land Angle:Positive
Land Width:0.20-0.30 mm / 0.008-0.012"

Learn more about carbide inserts Cutting-Edge Geometry Parameters.

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