Crucible Steel REX® M2 S High Speed Steel

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Crucible Steel REX® M2 S High Speed Steel
Categories:	Metal; Ferrous Metal; Tool Steel
Material Notes:	REX M2 is a tungsten-molybdenum high speed steel which gives outstanding performance in all operations where a general purpose high speed steel is required. REX M2 has a wide hardening range, excellent toughness, with good wear and red hardness characteristics. REX M2S is the sulfur-bearing counterpart of REX M2. The sulfur addition provides good grindability and an improvement in machinability of 25 to 35 per cent over a comparable nonsulfurized grade. Information provided by Crucible Industries
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Physical Properties	Original Value	Comments

Density	0.294 lb/in³

Mechanical Properties	Original Value	Comments
Hardness, Brinell	217 - 255
Hardness, Rockwell C	57 @Tempering Temp. 649 °C	hardened at 2250°F then tempered
	59 @Tempering Temp. 635.0 °C	hardened at 2250°F then tempered
	60.9 @Tempering Temp. 621 °C	hardened at 2250°F then tempered
	62.4 @Tempering Temp. 607.2 °C	hardened at 2250°F then tempered
	64 @Tempering Temp. 593 °C	hardened at 2250°F then tempered
	65 @Tempering Temp. 579.4 °C	hardened at 2250°F then tempered
	66 @Tempering Temp. 524 °C	hardened at 2250°F then tempered
	66 @Tempering Temp. 566 °C	hardened at 2250°F then tempered
	66.8 @Tempering Temp. 538 °C	hardened at 2250°F then tempered
	66.8 @Tempering Temp. 551.7 °C	hardened at 2250°F then tempered
Modulus of Elasticity	30000 ksi

Thermal Properties	Original Value	Comments
CTE, linear	6.40 µin/in-°F @Temperature 21.1 - 260 °C
	6.58 µin/in-°F @Temperature 21.1 - 427 °C
	6.72 µin/in-°F @Temperature 21.1 - 538 °C

Processing Properties	Original Value	Comments
Processing Temperature	1530 °F	Critical Thermal Treatment Temperature

Component Elements Properties	Original Value	Comments
Carbon, C	0.85 %
Chromium, Cr	4.15 %
Iron, Fe	>= 81 %	as balance
Manganese, Mn	0.30 %
Molybdenum, Mo	5.0 %
Silicon, Si	0.30 %
Sulfur, S	<= 0.030 %
Tungsten, W	6.4 %
Vanadium, V	1.95 %

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NCRUC912 / 160363

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