AISI Type M2 Molybdenum High Speed Tool Steel (UNS T11302)

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AISI Type M2 Molybdenum High Speed Tool Steel (UNS T11302)
Categories:	Metal; Ferrous Metal; Tool Steel; Cold Work Steel
Material Notes:	Used in high speed tool and cutting applications such as drills, milling processes, reamers, etc. Mo and W content promotes toughness and aids cutting properties, but requires more precise hardening conditions and caution about overheating. Quench via oil, air, or salt bath. Composition for UNS T11302 covers both reg C and high C versions of AISI M2. Data taken from the reference(s) and manufacturer data.
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Physical Properties	Metric	English	Comments

Density	8.14 g/cc	0.294 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell C	61 - 64	61 - 64	Austenitized and Tempered
	64 - 66	64 - 66	Oil Quenched from between 1121°C to 1232°C
Modulus of Elasticity	207 GPa	30000 ksi
Charpy Impact	31.2 - 38.0 J	23.0 - 28.0 ft-lb	Austenitized and Tempered

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000540 ohm-cm	0.0000540 ohm-cm

Thermal Properties	Metric	English	Comments
CTE, linear	11.5 µm/m-°C @Temperature 20.0 - 100 °C	6.39 µin/in-°F @Temperature 68.0 - 212 °F
	11.7 µm/m-°C @Temperature 20.0 - 200 °C	6.50 µin/in-°F @Temperature 68.0 - 392 °F
	12.2 µm/m-°C @Temperature 20.0 - 300 °C	6.78 µin/in-°F @Temperature 68.0 - 572 °F
	12.4 µm/m-°C @Temperature 20.0 - 400 °C	6.89 µin/in-°F @Temperature 68.0 - 752 °F
	12.7 µm/m-°C @Temperature 20.0 - 500 °C	7.06 µin/in-°F @Temperature 68.0 - 932 °F
	12.9 µm/m-°C @Temperature 20.0 - 700 °C	7.17 µin/in-°F @Temperature 68.0 - 1290 °F
	13.0 µm/m-°C @Temperature 20.0 - 600 °C	7.22 µin/in-°F @Temperature 68.0 - 1110 °F
Specific Heat Capacity	0.460 J/g-°C	0.110 BTU/lb-°F
Thermal Conductivity	19.0 W/m-K	132 BTU-in/hr-ft²-°F

Processing Properties	Metric	English	Comments
Processing Temperature	540 - 595 °C	1000 - 1100 °F	Tempering
	1190 - 1230 °C	2170 - 2250 °F	Hardening
Annealing Temperature	870 - 900 °C	1600 - 1650 °F

Component Elements Properties	Metric	English	Comments
Carbon, C	0.78 - 0.88 %	0.78 - 0.88 %	AISI M2 reg C
	0.95 - 1.05 %	0.95 - 1.05 %	AISI M2 high C
Chromium, Cr	3.75 - 4.5 %	3.75 - 4.5 %
Iron, Fe	78 - 82.4 %	78 - 82.4 %	As Balance
Manganese, Mn	0.15 - 0.40 %	0.15 - 0.40 %
Molybdenum, Mo	4.5 - 5.5 %	4.5 - 5.5 %
Nickel, Ni	<= 0.30 %	<= 0.30 %
Silicon, Si	0.20 - 0.45 %	0.20 - 0.45 %
Tungsten, W	5.5 - 6.75 %	5.5 - 6.75 %
Vanadium, V	1.75 - 2.2 %	1.75 - 2.2 %

References for this datasheet.

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MSTM2 / 178338

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