Latrobe Tatmo™ ASTM M1 High Speed Steel

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Latrobe Tatmo™ ASTM M1 High Speed Steel
Categories:	Metal; Ferrous Metal; Alloy Steel; Carbon Steel; High Carbon Steel; Tool Steel
Material Notes:	TATMO is an M1-type, general-purpose high speed steel. In comparison with other popular high speed steels, it exhibits excellent toughness and grindability. These factors and its relatively low cost make it an economic and efficient tool material. Typical applications for Tatmo 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	7.89 g/cc
Density	0.285 lb/in³

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	64.5	Oil Quenched from 1232°C
	65.5	Oil Quenched from 1121°C
	66.5	Oil Quenched from 1177°C
Modulus of Elasticity	31000 ksi
Machinability	55 - 65 %	1% Carbon Steel
Izod Impact Unnotched	28.0 ft-lb	Oil Quenched at 1218°C; 482°C Temper Temperature
	33.0 ft-lb	Oil Quenched at 1218°C; 622°C Temper Temperature
	38.0 ft-lb	Oil Quenched at 1218°C; 580°C Temper Temperature
	53.0 ft-lb	Oil Quenched at 1163°C; 482°C Temper Temperature
	57.0 ft-lb	Oil Quenched at 1163°C; 622°C Temper Temperature
	67.0 ft-lb	Oil Quenched at 1163°C; 580°C Temper Temperature

Thermal Properties	Original Value	Comments
CTE, linear	10.07 µm/m-°C @Temperature 38.0 - 260 °C
	12.33 µm/m-°C @Temperature 38.0 - 649 °C

Processing Properties	Original Value	Comments
Processing Temperature	724 °C	Critical Temperaure Ar3
	760 °C	Critical Temperaure Ar1
	827 °C	Critical Temperaure Ac1
	860 °C	Critical Temperaure Ac3

Component Elements Properties	Original Value	Comments
Carbon, C	0.83 %
Chromium, Cr	3.75 %
Iron, Fe	83.47 %
Manganese, Mn	0.25 %
Molybdenum, Mo	8.5 %
Silicon, Si	0.30 %
Tungsten, W	1.75 %
Vanadium, V	1.15 %

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NTIMK061 / 19408

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