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High Speed Steel Alloy Comparison


Use checkboxes to select two or more alloys.
	ASTM	Grade Name	Description	MI¹	HRC	Toughness Wear Resistance Grindability 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.