Latrobe Double Six™ ASTM M2 High Speed Steel

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Latrobe Double Six™ ASTM M2 High Speed Steel
Categories:	Metal; Ferrous Metal; Alloy Steel; Carbon Steel; High Carbon Steel; Tool Steel
Material Notes:	DOUBLE SIX (M2) is a tungsten-molybdenum high speed steel with a well balanced composition suitable for a wide variety of applications. World wide, the M2 type is by far the most popular high speed steel having replaced T1 high speed in most applications because of its superior properties and relative economy. Typical applications for Double Six high speed steel include twist drills, taps, milling cutters, reamers, broaches, saws, and knives. 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	8.14 g/cc
Density	0.294 lb/in³

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	64	Oil Quenched from 1121°C
	64.5	Oil Quenched from 1232°C
	66	Oil Quenched from 1177°C
Modulus of Elasticity	30000 ksi
Machinability	50 - 60 %	1% Carbon Steel
Izod Impact Unnotched	38.0 ft-lb	Oil Quenched at 1232°C; 482°C Temper Temperature
	41.0 ft-lb	Oil Quenched at 1232°C; 545°C Temper Temperature
	42.0 ft-lb	Oil Quenched at 1232°C; 622°C Temper Temperature
	42.0 ft-lb	Oil Quenched at 1177°C; 482°C Temper Temperature
	49.0 ft-lb	Oil Quenched at 1177°C; 622°C Temper Temperature
	71.0 ft-lb	Oil Quenched at 1177°C; 566°C Temper Temperature

Thermal Properties	Original Value	Comments
CTE, linear	10.95 µm/m-°C @Temperature 21.0 - 204 °C
	12.54 µm/m-°C @Temperature 21.0 - 358 °C

Processing Properties	Original Value	Comments
Processing Temperature	749 °C	Critical Temperaure Ar3
	777 °C	Critical Temperaure Ar1
	832 °C	Critical Temperaure Ac1
	877 °C	Critical Temperaure Ac3

Component Elements Properties	Original Value	Comments
Carbon, C	0.85 %
Chromium, Cr	4.15 %
Iron, Fe	81.42 %
Manganese, Mn	0.28 %
Molybdenum, Mo	5.0 %
Silicon, Si	0.30 %
Tungsten, W	6.15 %
Vanadium, V	1.85 %

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NTIMK062 / 19409

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