Machining DataSheet for

General Information:
Material GroupM - Stainless Steel
Sub-GroupPH Stainless Steel
Tensile Strength<1380 [N/mm^2]
Machinability43%

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Machining Material 17-4PH

17-4PH (Alloy 630) is a Precipitation-Hardening stainless steel with 17% Chromium, 4% nickel, and 4% copper content. It is primarily used in the oil & gas and aerospace industries, where a combination of high strength and corrosion resistance is critical.
17-4PH is supplied in several conditions that differ in their hardness and machinability. The Machining Doctor lists the machinability for material in 28 HRC, which is the lowest provided hardness (Also called Condition H1150).

The chart shows the hardness and machinability of the most common conditions:

ConditionSupplied Hardness (HRC)Machinability
H11502845%
H10753142%
Condition A3340%
H10253537%
H9004331%

 The below recommendations apply to material in condition H1150 at a hardness of 28 HRC. The speeds should be adjusted according to the actual hardness!

For example, suppose you need to machine material in condition H900 (with hardness of 43 HRC). The above table shows that the machinability is 31% compared with 45% for 28 HRC. Therefore you need to multiply the recommended speed by 31/45=0.69

The best way is to use our Advanced Speed & Feed Calculator, where you can adjust the hardness slider, and the software will take it into account.

Summery:

  • For detailed carbide grades recommendations, check the Below Chart, or use the Grades Wizrad.
  • Recommended Cutting speed range for turning at stable conditions is 520 - 710 [SFM] / 160 - 215 [m/min].
  • Recommended Cutting speed range for milling with stable clamping and short overhang is 330 - 440 [SFM] / 100 - 135 [m/min]
  • For detailed cutting speed recomendations, check the Below Table, or use our Speed and Feed Calculator.

    • Equivalent International Designations for Material 17-4PH

    Standard Name
    sae630
    wnr1.4542
    dinX5CrNiCuNb16-4
    unsUNS S17400
    anforZ6CNU17.04
    js1SUS 630

    Chemical Composition for Material 17-4PH

    Element Amount
    Chromium (Cr)16.3%
    Nickel (Ni)4%
    Copper (Cu)4%
    Silicon (Si)0.50%
    Manganese (Mn)0.50%
    Carbon (C)0.04%
    Phosphorus (P)0.02%
    Sulfur (S)0.02%

    Cutting Speeds Recomendations for Material 17-4PH

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

    ApplicationVc (m/min)Vc (SFM)
    Turning160-215520-710
    Milling100-135330-440
    Parting65-85210-280
    Grooving95-130310-430
    Drilling45-60150-200

    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 Material 17-4PH

    * 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 Material 17-4PH

    Honing Size:0.03-0.05 mm / 0.001-0.002"
    Rake Angle:9° -11°
    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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