Latrobe LSS™ D3 Tool Steel (ASTM D3)

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Latrobe LSS™ D3 Tool Steel (ASTM D3)
Categories:	Metal; Ferrous Metal; Alloy Steel; Carbon Steel; High Carbon Steel; Tool Steel; Oil-Hardening Steel
Material Notes:	TLS D3 tool steel is a high-carbon, high-chromium, oil-hardening tool steel that is characterized by a relatively high attainable hardness and numerous, large, chromium-rich alloy carbides in the microstructure. These carbides provide good resistance to wear from sliding contact with other metals and abrasive materials. TLS D3 exhibits excellent stability in heat treatment, holding size almost as well as the air-hardening, high-carbon, high-chromium die steels such as D2. Typical applications for TLS D3 tool steel include forming rolls, drawing dies, forming, powder compaction tooling, and lamination dies. 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	7.87 g/cc
Density	0.284 lb/in³

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	63.5	Air Cooled from 913°C, 45 minutes
	64	Air Cooled from 982°C, 30 minutes
	64.5	Air Cooled from 927°C, 30 minutes
Modulus of Elasticity	30000 ksi
Machinability	45 - 50 %	1% Carbon Steel
Izod Impact Unnotched	15.0 ft-lb	Oil Quenched from 954°C; As Quenched
	40.0 ft-lb	Oil Quenched from 954°C; 593°C Temper Temperature

Thermal Properties	Original Value	Comments
CTE, linear	11.84 µm/m-°C @Temperature 38.0 - 260 °C
	13.81 µm/m-°C @Temperature 38.0 - 538 °C

Processing Properties	Original Value	Comments
Processing Temperature	743 °C	Critical Temperaure Ar3
	766 °C	Critical Temperaure Ar1
	782 °C	Critical Temperaure Ac1
	832 °C	Critical Temperaure Ac3

Component Elements Properties	Original Value	Comments
Carbon, C	2.15 %
Chromium, Cr	12.25 %
Iron, Fe	84.55 %
Manganese, Mn	0.40 %
Silicon, Si	0.40 %
Vanadium, V	0.25 %

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NTIMK108 / 19455

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