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Ensinger PEI

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Crucible Steel REX® M42 High Speed Steel, AISI M42
Categories: Metal; Ferrous Metal; Tool Steel

Material Notes: REX M42 is a super cobalt high speed steel which may be heat treated to HRC 68. This makes REX M42 outstanding for special purpose cutting tools, with requirements beyond the capability of general purpose high speed steels.

Information provided by Crucible Industries

Key Words: AISI M42
Vendors: No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
 
Physical PropertiesOriginal ValueComments
Density 0.289 lb/in³
 
Mechanical PropertiesOriginal ValueComments
Hardness, Brinell 235 - 255
Hardness, Rockwell C 66oil quenched from 2050°F
 50
@Tempering Temp. 621 °C
oil quenched from 2050°F then tempered
 54
@Tempering Temp. 593 °C
oil quenched from 2050°F then tempered
 60
@Tempering Temp. 566 °C
oil quenched from 2050°F then tempered
 63
@Tempering Temp. 551.7 °C
oil quenched from 2050°F then tempered
 64.5
@Tempering Temp. 538 °C
oil quenched from 2050°F then tempered
Tensile Strength, Ultimate 372 ksihardened at 2175°F
 446 ksihardened at 2100°F
Modulus of Elasticity 30000 ksi
Charpy Impact 5.00 ft-lbhardened at 2175°F; C-notch
 7.00 ft-lbhardened at 2100°F; C-notch
 
Processing PropertiesOriginal ValueComments
Processing Temperature 1560 °FCritical Thermal Treatment Temperature
 
Component Elements PropertiesOriginal ValueComments
Carbon, C 1.08 %
Chromium, Cr 3.75 %
Cobalt, Co 8.0 %
Iron, Fe 74 %as balance
Manganese, Mn 0.30 %
Molybdenum, Mo 9.5 %
Silicon, Si 0.30 %
Sulfur, S 0.030 %
Tungsten, W 1.6 %
Vanadium, V 1.15 %

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