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Crucible Steel CPM® REX® 66 (HS) High Speed Steel
Categories: Metal; Ferrous Metal; Carbon Steel; High Carbon Steel; Tool Steel

Material Notes: CPM Rex 66 is a super high speed steel made by the Crucible Particle Metallurgy (CPM) process. It is a tungsten type high speed with a high vanadium content for excellent abrasion resistance, similar to that of CPM Rex T15, and 8% cobalt for a higher red hardness than CPM Rex T15. It also offers high compressive strength due to its high attainable hardness. It is best suited for applications requiring both a high red hardness and high wear resistance.

The CPM process results in a homogeneous microstructure with a finer, more uniform carbide distribution imparting superior dimensional stability, grindability and toughness when compared to steels produced by conventional processes. The CPM process also allows the design of more highly alloyed grades which cannot be produced by conventional steelmaking.

Information provided by Crucible Industries

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Physical PropertiesOriginal ValueComments
Density 8.249 g/cc
 
Mechanical PropertiesOriginal ValueComments
Hardness, Rockwell C 66hardened at 2050°F then quenched
 48.5
@Tempering Temp. 649 °C
hardened at 2050°F then quenched and tempered
 59.5
@Tempering Temp. 593 °C
hardened at 2050°F then quenched and tempered
 63.5
@Tempering Temp. 566 °C
hardened at 2050°F then quenched and tempered
 64.5
@Tempering Temp. 551.7 °C
hardened at 2050°F then quenched and tempered
 65
@Tempering Temp. 538 °C
hardened at 2050°F then quenched and tempered
Modulus of Elasticity 214 GPa
 
Thermal PropertiesOriginal ValueComments
CTE, linear 9.90 µm/m-°C
@Temperature 20.0 - 260 °C
 11.0 µm/m-°C
@Temperature 20.0 - 425 °C
 12.5 µm/m-°C
@Temperature 20.0 - 540 °C
 
Component Elements PropertiesOriginal ValueComments
Carbon, C 1.67 %
Chromium, Cr 4.75 %
Cobalt, Co 8.0 %
Iron, Fe 69.22 %as balance
Molybdenum, Mo 2.0 %
Sulfur, S 0.060 %
 0.22 %added to improve machinability
Tungsten, W 9.5 %
Vanadium, V 4.8 %

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