Machining DataSheet for

General Information:
Material GroupM - Stainless Steel
Sub-GroupFerritic Stainless Steel
Tensile Strength640-840 [N/mm^2]

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Machining Stainless Steel 430F

Stainless Steel 430F is a ferritic (Magnetic) stainless steel alloy with 17% chromium, 0.1% carbon and a machinability rating of 65%.

The amounts of carbon (Range 0.1-1.2%) and chromium (10-15%) are the main factors that affect the machinability of martensitic stainless materials.

  • More carbon ==> More strength, but lower machinability and less corrosion resistance
  • More chromium ==> More corrosion resistance, but lower machinabilty

  • The suffix 'F' stands for 'FreeCut'. Stainless Steel 430F Stainless Steel 420F has increased amount of Phosphorus and Sulfur to increase the machinability and improve the chip control relative to the standard 430 (without 'F').

    Due to its low carbon content Stainless Steel 430F has high toughness, and therefore it is very malleable. The main challenge to machining it (relative to other martensitic stainless alloys) is breaking the chips. Therefore, it is recommended to select a sharp cutting edge with a tight chip breaker. For this reason, inserts that are designed for ausanict stainless alloys (Such as 304 and 316) will work well also on Stainless Steel 430F


  • For general Turning of Stainless Steel 430F at stable conditions use a grade with a Semi Hard substrate and CVD coating.
  • In case you are running at a cutting speed that is lower than 390 SFM (120 m/min), it is better to use a grade with a
  • Semi Hard substrate and PVD coating.
  • For general Milling use a grade with a Semi Hard substrate and 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 790 - 1070 [SFM] / 240 - 325 [m/min].
  • Recommended Cutting speed range for milling with stable clamping and short overhang is 490 - 670 [SFM] / 150 - 205 [m/min]
  • For detailed cutting speed recomendations, check the Below Table, or use our Speed and Feed Calculator.

  • Equivalent International Designations for Stainless Steel 430F

    Standard Name

    Chemical Composition for Stainless Steel 430F

    Element Amount
    Chromium (Cr)17%
    Manganese (Mn)1.25%
    Nickel (Ni)1%
    Silicon (Si)1.00%
    Molybdenum (Mo)0.50%
    Sulfur (S)0.15%
    Carbon (C)0.12%
    Phosphorus (P)0.06%

    Cutting Speeds Recomendations for Stainless Steel 430F

    * 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 Stainless Steel 430F

    * If you do nott understand the below table? Read This Explanation to make the most out of it!

    Grade for Turning

    Grade for Milling (Indexable)

    Grade for Parting Off