Latrobe Tatmo-VN™ ASTM M7 High Speed Steel

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Latrobe Tatmo-VN™ ASTM M7 High Speed Steel
Categories:	Metal; Ferrous Metal; Alloy Steel; Carbon Steel; High Carbon Steel; Tool Steel
Material Notes:	TATMO-VN is an M7 type high speed steel modified by alloy balancing and a nitrogen addition to develop superior hardness response in heat treatment. It is an excellent grade for many cutting tool applications that require an optimum balance of red hardness, edge toughness and wear resistance. The combination of outstanding properties and high hardness response makes Tatmo-VN a logical alternative for cobalt high speed steels in may cutting tool applications. Typical applications for Tatmo-VN high speed steel include twist drills, taps, end mills, reamers and milling cutters. 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	7.94 g/cc
Density	0.287 lb/in³

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	59	Oil Quenched at 1218°C; 622°C Temper Temperature
	63	Oil Quenched from 1191°C; 482°C Temper Temperature
	63	Oil Quenched from 1191°C; 482°C Temper Temperature
	63.5	Oil Quenched at 1218°C; 482°C Temper Temperature
	66.1	Oil Quenched from 1191°C; 538°C Temper Temperature
	66.5	Oil Quenched at 1218°C; 538°C Temper Temperature
Modulus of Elasticity	30000 ksi
Machinability	45 - 50 %	1% Carbon Steel
Izod Impact Unnotched	21.0 ft-lb	Oil Quenched at 1218°C; 482°C Temper Temperature
	24.0 ft-lb	Oil Quenched at 1218°C; 594°C Temper Temperature
	27.0 ft-lb	Oil Quenched at 1218°C; 622°C Temper Temperature
	29.0 ft-lb	Oil Quenched at 1191°C; 594°C
	31.0 ft-lb	Oil Quenched at 1191°C; 482°C
	39.0 ft-lb	Oil Quenched at 1191°C; 622°C

Thermal Properties	Original Value	Comments
CTE, linear	11.68 µm/m-°C @Temperature 21.0 - 204 °C
	13.3 µm/m-°C @Temperature 21.0 - 538 °C

Processing Properties	Original Value	Comments
Processing Temperature	749 °C	Critical Temperaure Ar3
	780 °C	Critical Temperaure Ar1
	824 °C	Critical Temperaure Ac1
	860 °C	Critical Temperaure Ac3

Component Elements Properties	Original Value	Comments
Carbon, C	1.02 %
Chromium, Cr	3.75 %
Iron, Fe	82.53 %
Manganese, Mn	0.25 %
Molybdenum, Mo	8.5 %
Silicon, Si	0.30 %
Tungsten, W	1.75 %
Vanadium, V	1.9 %

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NTIMK068 / 19415

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