General Information:
Material GroupS - Superalloys (Heat resistant and Titanium)
Sub-GroupTitanium alloy
Hardne36.0 HRC
Tensile Strength1130 [N/mm^2]

Machining Material Ti-425 MIL

Material Ti-425 MIL is a titanium alloy with a hardness of 36 HRC and a machinability rating of 17%.

Titanium alloys such as Ti-425 MIL are used in mechanical components for two main reasons:

  • It has an excellent strength-to-weight ratio. On the one hand, it is almost as light as aluminum, and on the other hand, it has a higher strength than most steel alloys.
  • It has superb corrosion resistance.

The main challenges of machining Ti-425 MIL are:

  • Ti-425 MIL has very low heat conductivity. It causes heat generating from the cut to transfer mainly to the cutting tool instead of flowing to the chips and workpiece.
  • It has high flexibility, thus bending easily by the cutting forces.
  • High hardness of 36 HRC leads to premature wear.

Tip for machining Ti-425 MIL:

  • Use a positive cutting edge in medium/roughing operation, preferably gound with a small honing size.
  • In finish operations, use only ground inserts/tools with sharp cutting edges and minimal honing size.
  • On supper-finish applications, you can also use cutting tools that are designed for aluminum without honing.
  • On small diameter parts, on a workpiece with thin walls, or poorly clamped workpiece, be gentle with your depth of cut and feed rate to reduce the cutting force.
  • Use an insert/tool with a very hard substrate because Ti-425 MIL has a hardness of 36 HRC


  • For detailed carbide grades recommendations, check the Below Chart, or use the Grades Wizrad.
  • Recommended Cutting speed range for turning at stable conditions is 200 - 260 [SFM] / 60 - 80 [m/min].
  • Recommended Cutting speed range for milling with stable clamping and short overhang is 150 - 200 [SFM] / 45 - 60 [m/min]
  • For detailed cutting speed recomendations, check the Below Table, or use our Speed and Feed Calculator.

  • Equivalent International Designations for Material Ti-425 MIL


    Chemical Composition for Material Ti-425 MIL

    Aluminum (Al)4.5%
    Iron (Fe)1.2-1.8%

    Cutting Speeds Recomendations for Material Ti-425 MIL

    * 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 Material Ti-425 MIL

    * 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 Material Ti-425 MIL

    Honing Siz0.02-0.05 mm / 0.001-0.002"
    Rake Angl13° -18°
    Land AnglNeutral
    Land Widt0.10-0.20 mm / 0.004-0.008"
    Ground InserRecommended

    Learn more about carbide inserts Cutting-Edge Geometry Parameters.

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