Machining DataSheet for

General Information:
Material GroupS - Superalloys (Heat resistant and Titanium)
Hardness27.0 HRC
Tensile Strength850 [N/mm^2]

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Machining Material Multimet N-155

Multimet N-155 is a Nickel-based heat resistant superalloy (HRSA) material with a Machinability rating of 18% and Hardness of 27 HRC.

Multimet N-155 has 20% 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).

Multimet N-155 is among the hardest of the nickel-based alloys, and accordingly has poor machinability of only 18%

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.


  • For general Turning of Material Multimet N-155 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 200 - 280 [SFM] / 60 - 85 [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 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 Multimet N-155

    Standard Name

    Chemical Composition for Material Multimet N-155

    Element Amount
    Iron (Fe)32%
    Chromium (Cr)21%
    Nickel (Ni)20%
    Cobalt (Co)20%
    Molybdenum (Mo)3%
    Carbon (C)0.1%

    Cutting Speeds Recomendations for Material Multimet N-155

    * 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 Multimet N-155

    * 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)