Latrobe DuraTech™ M4 Powder Metal High Speed Steel (ASTM M4)

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Latrobe DuraTech™ M4 Powder Metal High Speed Steel (ASTM M4)
Categories:	Metal; Ferrous Metal; Alloy Steel; Carbon Steel; High Carbon Steel; Tool Steel
Material Notes:	DuraTech M4 high speed steel is an extremely versatile high speed steel which provides a unique combination of high wear resistance with high impact toughness and transverse bend strength. A large volume of vanadium carbides provides the high wear resistance. The high impact toughness and high transverse bend strength are results of the fine grain size, small carbides, and superior cleanliness of the powder metallurgy (PM) microstructure. DuraTech M4 offers improved cutting tool life compared to conventionally-wrought M1, M2, M7, and other lower-alloyed high speed steels. DuraTech M4 also excels in cold work tooling applications, where it provides better toughness and wear resistance than high-carbon, high-chromium die steels such as D2 and D3. Information Provided by Timken Latrobe Steel. Timken sold Latrobe in December 2006. They are now Latrobe Specialty Steels Co.
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Physical Properties	Original Value	Comments

Specific Gravity	7.92 g/cc
Density	0.286 lb/in³

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	57	538°C Test Temperature; Oil Quenched from 1204°C; 552°C Triple Temper Temperature
	65.5	22°C Test Temperature; Oil Quenched from 1204°C; 552°C Triple Temper Temperature
	20 @Temperature 704 °C	Oil Quenched from 1204°C; 552°C Triple Temper Temperature
Modulus of Elasticity	31000 ksi
Machinability	40 - 45 %	1% Carbon Steel

Thermal Properties	Original Value	Comments
CTE, linear	9.53 µm/m-°C @Temperature 38.0 - 260 °C
	12.24 µm/m-°C @Temperature 38.0 - 649 °C

Processing Properties	Original Value	Comments
Processing Temperature	840 °C	Critical Temperaure Ac1

Component Elements Properties	Original Value	Comments
Carbon, C	1.45 %
Chromium, Cr	4.5 %
Iron, Fe	79 %
Manganese, Mn	0.25 %
Molybdenum, Mo	5.2 %
Silicon, Si	0.25 %
Tungsten, W	5.5 %
Vanadium, V	3.85 %

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NTIMK075 / 19422

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