Crucible Steel CPM® Rex M4 HC(HS) Tool Steel

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Crucible Steel CPM® Rex M4 HC(HS) Tool Steel
Categories:	Metal; Ferrous Metal; Carbon Steel; High Carbon Steel; Tool Steel
Material Notes:	CPM REX M4 HC(HS) is a high vanadium special purpose high speed steel exhibiting better wear resistance and toughness than M2 or M3 in cold work punches, die inserts and cutting applications involving high speed and light cuts. The high carbon (HC) modification to standard M4 is designed to provide optimum hardening response in larger cross-section tools or in vacuum or atmosphere heat treating. The high sulfur (HS) modification is standard for larger diameter bars, providing enhanced machinability and grindability. The CPM process produces very homogeneous, high quality steel characterized by superior dimensional stability, grindability, and toughness compared to steels produced by conventional processes. Information provided by Crucible Specialty Metals.
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Physical Properties	Original Value	Comments

Density	7.97 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Brinell	225 - 255	Annealed
Hardness, Rockwell C	63.5	Hardening Temperature- 1165°C; Tempering Temperature- 565°C
	65.5	Hardening Temperature- 1205°C; Tempering Temperature- 550°C
Modulus of Elasticity	214 GPa
Flexural Strength	5088 MPa	Hardening Temperature- 1205°C, Tempering Temperature- 550°C
	5129 MPa	Hardening Temperature- 1165°C, Tempering Temperature- 565°C
Charpy Impact	27.0 J	Hardening Temperature- 1205°C; Tempering Temperature- 550°C
	38.0 J	Hardening Temperature- 1165°C; Tempering Temperature- 565°C

Thermal Properties	Original Value	Comments
CTE, linear	11.5 µm/m-°C @Temperature 40.0 - 260 °C
	12.1 µm/m-°C @Temperature 40.0 - 540 °C
Thermal Conductivity	18.99 W/m-K
	20.82 W/m-K @Temperature 100 °C
	23.96 W/m-K @Temperature 300 °C
	25.58 W/m-K @Temperature 500 °C
	26.09 W/m-K @Temperature 540 °C

Component Elements Properties	Original Value	Comments
Carbon, C	1.42 %
Chromium, Cr	4.0 %
Iron, Fe	79.47 %	As Remainder
Magnesium, Mg	0.30 - 0.70 %
Molybdenum, Mo	5.25 %
Sulfur, S	0.060 - 0.22 %
Tungsten, W	5.5 %
Vanadium, V	4.0 %

Descriptive Properties
Grindability; Metal Removed/Wheel Worn	4

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NCRUC005 / 15998

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