Machining DataSheet for

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Machining Steel D3

Steel D3 is a Tool Steel (High-alloy steel) that has on top of the 2.2% of carbon an additional 14.2% of manganese, chromium, nickel, tungsten (See details in the below table). Steel D3 has a machinability rating of 23%.

Steel D3 belongs to the "D series" of tool steels. They are classified as High-carbon, high-chromium, cold-work steels and contain very high Carbon content (up to 2.5%). Tool Steels in this series (D2-D7) have a machinability rating of 20-30%. The high carbon content yields very high hardness and strength resulting in materials that are very difficult to machine

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


  • For turning operations on Steel D3, 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 280 - 380 [SFM] / 85 - 115 [m/min].
  • Recommended Cutting speed range for milling with stable clamping and short overhang is 180 - 230 [SFM] / 55 - 70 [m/min]
  • For detailed cutting speed recomendations, check the Below Table, or use our Speed and Feed Calculator.

  • Equivalent International Designations for Steel D3

    Standard Name
    uniX210Cr13KU / X250Cr12KU

    Chemical Composition for Steel D3

    Element Amount
    Chromium (Cr)11.00-13.50%
    Carbon (C)2.00-2.35%
    Tungsten (W)1.00 max%
    Vanadium (V)1.00 max%
    Manganese (Mn)0.60 max%
    Silicon (Si)0.60 max%
    Nickel (Ni)0.30 max%

    Cutting Speeds Recomendations for Steel D3

    * 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 D3

    * 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 D3

    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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