Machining DataSheet for

General Information:
Material GroupP - Steel
Sub-GroupLow Alloy Steel
Tensile Strength800-1100 [N/mm^2]
Machinability Range70% - 84%

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Equivalent International Designations for Steel 9840

Standard Name
sae9840
wnr1.6511
din36CrNiMo4
bs816M40
anfor40NCD3
uni38NiCrMo4(KB)
unf35NiCrMo4

Chemical Composition for Steel 9840

Sorry, Not Availble for this Material


Cutting Speeds Recomendations for Low Alloyed Steel (Alloying elements less than 8%)

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

ApplicationVc (m/min)Vc (SFM)
Turning305-3701000-1210
Milling190-230620-750
Parting145-175480-570
Grooving170-205560-670
Drilling125-145410-480

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 9840

* 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 9840

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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