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Crucible Steel REX® M4 High Speed Steel

Category Metal , Ferrous Metal , Tool Steel
Manufacturer Crucible Steel
Trade Name
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Crucible Steel REX® M4 High Speed Steel.pdf
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Material Notes:
REX M4 is a special purpose high speed steel designed to give high wear resistance in tools. Its high vanadium and carbon content provide for high resistance to cratering and wear in cold work punches, die inserts, and cutting applications involving high speeds and light cuts. It is designed to give maximum performance working with abrasive materials, exhibiting better wear resistance than M2 or M3.Information provided by Crucible Industries
Physical Properties Metric English Comments
Density 7.92 g/cc
0.286 lb/in³
Mechanical Properties Metric English Comments
Hardness, Rockwell C 63

@Tempering Temp. 568.3 °C
63

@Tempering Temp. 1055 °F
hardened at 2120°F, then quenched and tempered
65

@Tempering Temp. 551.7 °C
65

@Tempering Temp. 1025 °F
hardened at 2200°F, then quenched and tempered
Modulus of Elasticity 214 GPa
31000 ksi
Charpy Impact 11.5 J

@Tempering Temp. 551.7 °C
8.50 ft-lb

@Tempering Temp. 1025 °F
hardened at 2200°F, then tempered; C-notch
14.9 J

@Tempering Temp. 568.3 °C
11.0 ft-lb

@Tempering Temp. 1055 °F
hardened at 2120°F, then tempered; C-notch
Thermal Properties Metric English Comments
CTE, linear 9.58 µm/m-°C

@Temperature 37.8 - 260 °C
5.32 µin/in-°F

@Temperature 100 - 500 °F
11.2 µm/m-°C

@Temperature 37.8 - 427 °C
6.24 µin/in-°F

@Temperature 100 - 800 °F
12.0 µm/m-°C

@Temperature 37.8 - 538 °C
6.64 µin/in-°F

@Temperature 100 - 1000 °F
12.3 µm/m-°C

@Temperature 37.8 - 649 °C
6.82 µin/in-°F

@Temperature 100 - 1200 °F
12.6 µm/m-°C

@Temperature 37.8 - 816 °C
6.99 µin/in-°F

@Temperature 100 - 1500 °F
Component Elements Properties Metric English Comments
Carbon, C 1.3 %
1.3 %
Chromium, Cr 4.3 %
4.3 %
Iron, Fe 79.7 %
79.7 %
as balance
Manganese, Mn 0.30 %
0.30 %
Molybdenum, Mo 4.5 %
4.5 %
Silicon, Si 0.30 %
0.30 %
Tungsten, W 5.6 %
5.6 %
Vanadium, V 4.0 %
4.0 %
Chemical Properties Metric English Comments
Critical Temperature 840.6 °C
1545 °F
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