Machining DataSheet for

General Information:
Material GroupP - Steel
Sub-GroupLow Alloy Steel
Tensile Strength650-950 [N/mm^2]
Machinability69%

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Machining Steel 4130

SAE 4130 is Chromium-molybdenum steel produced with 0.15–0.25% molybdenum and 0.8–1.1% chromium content. It has good hardenability, strength, wear resistance, toughness, and ductility. 4140 Steel is used mainly on automotive parts such as connecting rods, engine mounting lugs, shafts, gears, and axles.

The hardness of these steels depends on the heat treatment:

  • 155 HB - Anealed.
  • 165 – 220 HB - Normalized.
  • 200 – 330 HB - Quenched

The average machinability rating of 4130 steel is around 70% (Annealed condition).

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

Summery:

  • For turning operations on 4130, it is best to use inserts with thick CVD coating and medium hardness. For milling, any all-around carbide grade is suitable.
  • For detailed carbide grades recommendations, check the Below Chart, or use the Grades Wizrad.
  • Recommended Cutting speed range for turning at stable conditions is 840 - 1150 [SFM] / 255 - 350 [m/min].
  • Recommended Cutting speed range for milling with stable clamping and short overhang is 520 - 710 [SFM] / 160 - 215 [m/min]
  • For detailed cutting speed recomendations, check the Below Table, or use our Speed and Feed Calculator.

    • Equivalent International Designations for Steel 4130

    Standard Name
    sae4130
    wnr1.7218
    din25CrMo4
    bs1717CDS110
    ss2225
    anfor25CD4
    uni25CrMo4(KB)
    unf55Cr3AM26CrMo4
    js1SCM420-SCM430

    Chemical Composition for Steel 4130

    Element Amount
    Chromium (Cr).80-1.10%
    Manganese (Mn).40-.60%
    Carbon (C).28-.33%
    Molybdenum (Mo).15-.25%

    Cutting Speeds Recomendations for Steel 4130

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

    ApplicationVc (m/min)Vc (SFM)
    Turning255-350840-1150
    Milling160-215520-710
    Parting125-165410-540
    Grooving145-195480-640
    Drilling105-140340-460

    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 4130

    * 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 4130

    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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