AISI Type W1 Tool Steel, water quenched at 775°C (1425°F), tempered 350°C (660°F)

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AISI Type W1 Tool Steel, water quenched at 775°C (1425°F), tempered 350°C (660°F)
Categories:	Metal; Ferrous Metal; Carbon Steel; High Carbon Steel; Tool Steel; Water-Hardening Steel
Material Notes:	The highest quality, water hardening carbon tool steel, controlled for hardenability and subject to the most rigid tests to ensure maximum uniformity in performance, with a composition held to closest limits.
Key Words:	UNS T72301
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Physical Properties	Metric	English	Comments

Density	7.83 g/cc	0.283 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	498	498	Converted from Rockwell C Hardness.
Hardness, Knoop	558	558	Converted from Rockwell C Hardness.
Hardness, Rockwell C	50 - 51	50 - 51	370°C temper
Hardness, Vickers	531	531	Converted from Rockwell C Hardness.
Tensile Strength, Ultimate	1680 MPa	244000 psi
Tensile Strength, Yield	1500 MPa	218000 psi
Elongation at Break	3.5 %	3.5 %
Modulus of Elasticity	205 GPa	29700 ksi
Bulk Modulus	160 GPa	23200 ksi	Typical for steels.
Poissons Ratio	0.28	0.28
Machinability	40 %	40 %	Based on AISI 1212 steel = 100%
Shear Modulus	80.0 GPa	11600 ksi
Charpy Impact, Unnotched	86.0 J	63.4 ft-lb

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000300 ohm-cm	0.0000300 ohm-cm	at 20ºC

Thermal Properties	Metric	English	Comments
CTE, linear	10.4 µm/m-°C @Temperature 20.0 - 100 °C	5.78 µin/in-°F @Temperature 68.0 - 212 °F
	12.2 µm/m-°C @Temperature 0.000 - 300 °C	6.78 µin/in-°F @Temperature 32.0 - 572 °F
	13.8 µm/m-°C @Temperature 0.000 - 500 °C	7.67 µin/in-°F @Temperature 32.0 - 932 °F
Specific Heat Capacity	0.461 J/g-°C @Temperature 0.000 - 100 °C	0.110 BTU/lb-°F @Temperature 32.0 - 212 °F
Thermal Conductivity	48.0 W/m-K	333 BTU-in/hr-ft²-°F

Processing Properties	Metric	English	Comments
Processing Temperature	175 - 345 °C	347 - 653 °F	Tempering Temperature
	760 - 845 °C	1400 - 1550 °F	Hardening Temperature
Annealing Temperature	740 - 790 °C	1360 - 1450 °F

Component Elements Properties	Metric	English	Comments
Carbon, C	0.70 - 1.5 %	0.70 - 1.5 %	usually 0.90% to 1.10%
Chromium, Cr	<= 0.15 %	<= 0.15 %
Iron, Fe	97.2 - 99.2 %	97.2 - 99.2 %	As Balance
Manganese, Mn	0.10 - 0.40 %	0.10 - 0.40 %
Molybdenum, Mo	<= 0.10 %	<= 0.10 %
Phosphorus, P	<= 0.025 %	<= 0.025 %
Silicon, Si	0.10 - 0.40 %	0.10 - 0.40 %
Sulfur, S	<= 0.025 %	<= 0.025 %
Tungsten, W	<= 0.15 %	<= 0.15 %
Vanadium, V	<= 0.10 %	<= 0.10 %

References for this datasheet.

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Overview of materials for Water-Hardening Steel

MSTW1B / 14107

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