Machining DataSheet for

Watch the Video:
"How to use the Material Pages"
and get the most out of this page!

Machining Steel O1

Steel O1 is a Tool Steel (High-alloy steel) that has on top of the 0.9% of carbon an additional 2.3% of manganese, chromium, nickel, tungsten (See details in the below table). Steel O1 has a machinability rating of 42%.

Steel O1 belongs to the "O series" of tool steels. They are classified as oil-hardening cold-work steel and contain high Carbon content (around 1%). Tool Steels in this series (O1-O7) have a machinability rating of 30-40%. The relatively high carbon content yields higher hardness and strength, resulting in low machinability

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


  • For turning operations on Steel O1, a lower cutting speed is recommended due to the low machinability. Therefore, in most cases it is recomended to use a grade with high hardness and PVD coating . For milling, opt for a grade with relativly hard substrate.
  • For detailed carbide grades recommendations, check the Below Chart, or use the Grades Wizrad.
  • Recommended Cutting speed range for turning at stable conditions is 510 - 690 [SFM] / 155 - 210 [m/min].
  • Recommended Cutting speed range for milling with stable clamping and short overhang is 310 - 430 [SFM] / 95 - 130 [m/min]
  • For detailed cutting speed recomendations, check the Below Table, or use our Speed and Feed Calculator.

  • Equivalent International Designations for Steel O1

    Standard Name

    Chemical Composition for Steel O1

    Element Amount
    Manganese (Mn)1.00-1.40%
    Carbon (C)0.85-1.00%
    Silicon (Si)0.50%
    Chromium (Cr)0.40-0.60%
    Tungsten (W)0.40-0.60%
    Nickel (Ni)0.30%
    Vanadium (V)0.30%
    Copper (Cu)0.25%
    Phosphorus (P)0.03%
    Sulfur (S)0.03%

    Cutting Speeds Recomendations for Steel O1

    * 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 O1

    * 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 O1

    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.

    Enjoy Ads Free Browsing !

    Are you tired of ads on our website? Become a premium user for Just 1.5 Dollars per Month and get rid of all the ads pop-ups.

    Scroll to Top