General Information:
Material Group P - Steel
Sub-Group Low Alloy Steel
Tensile Strength 1100-1300 [N/mm^2]

Machining Steel 4150

Steel 4150 is a low-alloy steel with a carbon content of 0.5% and additional 2.1% content of manganese, chromium, and molybdenum.. (See details in the below table). Steel 4150 has a machinability rating of 61%.

Low alloy steels are very popular in machine shops. The small amount of alloying elements enhances their mechanical properties and hardenability without a significant sacrifice in terms of machinability.

You can find here a list of machinability Ratings for different Low Alloy Steels.


  • For general Turning of Steel 4150 at stable conditions use a grade with a Hard substrate and CVD coating.
  • In case you are running at a cutting speed that is lower than 490 SFM (150 m/min), it is better to use a grade with a
  • Hard substrate and PVD coating.
  • For general Milling use a grade with a Semi Hard substrate and Thin PVD coating.
  • For detailed carbide grades recommendations, check the Below Chart, or use the Grades Wizrad.
  • Recommended Cutting speed range for turning at stable conditions is 740 - 1020 [SFM] / 225 - 310 [m/min].
  • Recommended Cutting speed range for milling with stable clamping and short overhang is 460 - 620 [SFM] / 140 - 190 [m/min]
  • For detailed cutting speed recomendations, check the Below Table, or use our Speed and Feed Calculator.
  • Equivalent International Designations for Steel 4150

    Standard Name

    Chemical Composition for Steel 4150

    Element Amount
    Chromium (Cr).80-1.10%
    Manganese (Mn).75-1.00%
    Carbon (C).48-.53%
    Molybdenum (Mo).15-.25%

    Cutting Speeds Recomendations for Steel 4150

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

    ApplicationVc (m/min)Vc (SFM)

    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 4150

    * If you don't 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 4150

    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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