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High Speed Steel Alloy Comparison

Cold Work SteelShock SteelHot Work Tool SteelHigh Speed SteelAerospace
    Use checkboxes to select two or more alloys.
  ASTM Grade Name Description MI1 HRC   Toughness
  Wear Resistance
  Hot Hardness
  M1  Tatmo™  A general purpose high speed steel which is good for interrupted cutting operations.  55  65 

  M2  Double Six™  The most widely used general purpose high speed steel with a very good balance of properties and cost effectiveness.   50  65 

  DIN 1.3343  M2 EUR™  The higher carbon variant of M2 which is common in Europe. Has slightly higher attainable hardness with a slight sacrifice in toughness.   50  65 

  M3-1  Corsair™  Higher carbon and vanadium contents than M2 provide improved wear resistance and hot hardness.   40  66 

  M3-2  Crusader™  Still higher carbon and vanadium contents provide significant gains in cutting tool performance.  35  66 

  M4  Stark™  A high speed steel in which the high wear resistance comes from a high volume of hard vanadium carbides.  35  65 

  M4  CPM® Rex M4 HC  Powder metal version of M4 with very high toughness. A versatile steel for many cold work applications as well, especially punches.  45  65 

  M7N  Tatmo V-N™  A nitrogen modified M7 high speed steel for improved attainable hardness. Very popular for twist drills.  45  66 

  M35  HS 105™  An M2-base composition with a cobalt addition for enhanced attainable hardness and hot hardness. The common super high speed steel in Europe.   45  65 

  M42  Dynamax™  A high cobalt super high speed steel. High wear resistance comes from high hardness rather than a high volume of vanadium carbides.   35  68 

  M48  CPM® Rex 76  A premium super high speed steel for long production runs, heavy duty machining and abrasive materials. Commonly used for hobs.  15  69 

  M50  CM-50™  An intermediate high speed steel for use where hot hardness is not critical. Common applications are consumer twist drills and woodworking tools.  65  63 

  M52  CM-52™  An intermediate high speed steel with improved wear resistance compared to M50.  55  63 

  T15  Dynavan™  A super tungsten high speed steel with a large volume of vanadium carbides for high wear resistance.  20  67 

  T15  CPM® Rex T15  The powder metal version of T15 with greatly enhanced toughness and grindability. Commonly used for broaches.  25  67 

    DuraTech™ 30  A powder metal M3-2 speed steel with a cobalt addition for high performance cutting tools. The highest toughness super high speed steel.  30  67 

Machinability Index: Relative machinability, as a percentage, compared to machining a 1% carbon tool steel.