Machining DataSheet for

General Information:
Material GroupS - Superalloys (Heat resistant and Titanium)
Sub-GroupSuperalloy
Hardness37.0 HRC
Tensile Strength1170 [N/mm^2]
Machinability13%

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Machining Material Inconel 725

Inconel 725 is a Nickel-based heat resistant superalloy (HRSA) material with a Machinability rating of 13% and Hardness of 37 HRC.

Inconel 725 has 58% nickel and additional alloying elements per the below table.

The main feature of nickel-based alloys is their excellent strength across a wide temperature range combined with good corrosion resistance. In this sub-group, the material standards also define the allowed hardness range, and hardness is a significant factor affecting the machinability (besides the chemical composition).

Inconel 725 is among the hardest of the nickel-based alloys, and accordingly has poor machinability of only 13%

Superalloys should be machined with a positive and sharp cutting edges. Geometries that are suitable for austenitic stainless steel will also work well on HRSA. However, quality manufacturers will have in their catalogs additional geometries that are specifically designed for these challenging materials.

Summery:

  • For general Turning of Material Inconel 725 at stable conditions use a grade with a Very 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 150 - 200 [SFM] / 45 - 60 [m/min].
  • Consider using CBN inserts. Although they cost more than twice, they enable increasing the cutting speed by 2-4 times (relative to carbide). Learn More ⇒
  • Recommended Cutting speed range for milling with stable clamping and short overhang is 110 - 150 [SFM] / 35 - 45 [m/min]
  • For detailed cutting speed recomendations, check the Below Table, or use our Speed and Feed Calculator.

    • Equivalent International Designations for Material Inconel 725

    Standard Name

    Chemical Composition for Material Inconel 725

    Element Amount
    Nickel (Ni)58%
    Chromium (Cr)21%
    Iron (Fe)9.0%
    Molybdenum (Mo)8%
    Titanium (Ti)1.5%
    Aluminum (Al)0.3%

    Cutting Speeds Recomendations for Material Inconel 725

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

    ApplicationVc (m/min)Vc (SFM)
    Turning45-60150-200
    Milling35-45110-150
    Parting30-35100-110
    Grooving40-50130-160
    Drilling40-50130-160

    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 Inconel 725

    * 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 Inconel 725

    Honing Size:0.02-0.05 mm / 0.001-0.002"
    Rake Angle:13° -18°
    Land Angle:Neutral
    Land Width:0.10-0.20 mm / 0.004-0.008"
    Ground Insert:Recommended

    Learn more about carbide inserts Cutting-Edge Geometry Parameters.

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