Crucible Steel REX® M4 High Speed Steel

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Crucible Steel REX® M4 High Speed Steel
Categories:	Metal; Ferrous Metal; Tool Steel
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
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Physical Properties	Original Value	Comments

Density	0.286 lb/in³

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	63 @Tempering Temp. 568.3 °C	hardened at 2120°F, then quenched and tempered
	65 @Tempering Temp. 551.7 °C	hardened at 2200°F, then quenched and tempered
Modulus of Elasticity	31000 ksi
Charpy Impact	8.50 ft-lb @Tempering Temp. 551.7 °C	hardened at 2200°F, then tempered; C-notch
	11.0 ft-lb @Tempering Temp. 568.3 °C	hardened at 2120°F, then tempered; C-notch

Thermal Properties	Original Value	Comments
CTE, linear	5.32 µin/in-°F @Temperature 37.8 - 260 °C
	6.24 µin/in-°F @Temperature 37.8 - 427 °C
	6.64 µin/in-°F @Temperature 37.8 - 538 °C
	6.82 µin/in-°F @Temperature 37.8 - 649 °C
	6.99 µin/in-°F @Temperature 37.8 - 816 °C

Processing Properties	Original Value	Comments
Processing Temperature	1545 °F	Ac₁ Critical Thermal Treatment Temperature

Component Elements Properties	Original Value	Comments
Carbon, C	1.3 %
Chromium, Cr	4.3 %
Iron, Fe	79.7 %	as balance
Manganese, Mn	0.30 %
Molybdenum, Mo	4.5 %
Silicon, Si	0.30 %
Tungsten, W	5.6 %
Vanadium, V	4.0 %

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NCRUC906 / 160357

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