General Information:
Material GroupP - Steel
Sub-GroupFree-Cutting Steel
Tensile Strength430-740 [N/mm^2]

Machining Steel 12L14

Steel 12L14 is a free-cutting steel, which is a nickname for carbon steel materials with an increased amount of alloying elements for the sole purpose of improving their machinability. These elements are usually sulfur and/or lead.

Steel 12L14 contains 0.3% of lead and 0.3% of sulfur. This small addition of elements increases its machinability rating up to 170%

You can find here a list of machinability Ratings for different Free-Cut Steels.


  • For general Turning of Steel 12L14 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 2080 - 2800 [SFM] / 635 - 855 [m/min].
  • Recommended Cutting speed range for milling with stable clamping and short overhang is 1300 - 1740 [SFM] / 395 - 530 [m/min]
  • For detailed cutting speed recomendations, check the Below Table, or use our Speed and Feed Calculator.

  • Equivalent International Designations for Steel 12L14


    Chemical Composition for Steel 12L14

    Manganese (Mn)0.85-1.15%
    Sulfur (S)0.26-0.35%
    Lead (Pb)0.15-0.35%
    Carbon (C)0.15%

    Cutting Speeds Recomendations for Steel 12L14

    * 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 12L14

    * 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 12L14

    Honing Siz0.05-0.08 mm / 0.002-0.003"
    Rake Angl11° -13°
    Land AnglPositive
    Land Widt0.20-0.30 mm / 0.008-0.012"

    Learn more about carbide inserts Cutting-Edge Geometry Parameters.

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