Latrobe LSS™ D5 Tool Steel (ASTM D5)

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Latrobe LSS™ D5 Tool Steel (ASTM D5)
Categories:	Metal; Ferrous Metal; Alloy Steel; Carbon Steel; High Carbon Steel; Tool Steel; Air-Hardening Steel
Material Notes:	TLS D5 tool steel is an air hardening, high-carbon, high-chromium, tool steel that is characterized by a cobalt addition which provides unique resistance to galling and pick-up. The cobalt also imparts some resistance to tempering, which makes TLS D5 suitable for some semi-hot work tooling applications. 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	7.73 g/cc
Density	0.279 lb/in³

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	62	Air Cooled from 1038°C, 30 minutes
	62.5	Air Cooled from 982°C, 45 minutes
	63	Air Cooled from 996°C, 30 minutes
Modulus of Elasticity	30000 ksi
Machinability	45 - 50 %	1% Carbon Steel
Izod Impact Unnotched	40.0 ft-lb	Air Cooled from 1010°C; 483°C Temper Temperature
	52.0 ft-lb	Air Cooled from 1010°C; 145°C Temper Temperature
	88.0 ft-lb	Air Cooled from 1010°C; 593°C Temper Temperature

Thermal Properties	Original Value	Comments
CTE, linear	9.88 µm/m-°C @Temperature 38.0 - 260 °C
	12.02 µm/m-°C @Temperature 38.0 - 538 °C

Processing Properties	Original Value	Comments
Processing Temperature	754 °C	Critical Temperaure Ar1
	832 °C	Critical Temperaure Ac1

Component Elements Properties	Original Value	Comments
Carbon, C	1.5 %
Chromium, Cr	11.65 %
Cobalt, Co	2.8 %
Iron, Fe	82.4 %
Manganese, Mn	0.35 %
Molybdenum, Mo	0.80 %
Silicon, Si	0.50 %

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NTIMK109 / 19456

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