AISI Type O6 Tool Steel

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AISI Type O6 Tool Steel
Categories:	Metal; Ferrous Metal; Tool Steel; Cold Work Steel; Oil-Hardening Steel
Material Notes:	General purpose, oil-hardening, nondeforming alloy tool steel suitable for applications where extreme dimensional accuracy is required. Applications include ring and plug gages, drawing dies, perforating dies and punches where excellent wear resistance is desired. Contains free graphite in the microstructure to improve machinability.
Key Words:	AISI Oil-Hardening Tool Steel O6, UNS T31506, ASTM A681, FED QQ-T-570, SAE J437, SAE J438, oil-hardening, non-deforming alloy tool steel suitable, dimensional accuracy, wear resistant, ring gages, plug gages, drawing dies, perforating dies and punches
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Physical Properties	Metric	English	Comments

Density	7.67 g/cc	0.277 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	752	752	Converted from Rockwell C hardness.
Hardness, Knoop	850	850	Converted from Rockwell C hardness.
Hardness, Rockwell C	65	65	As hardened, 64.0 HRC at 120°C temper, 63.0 HRC at 150°C temper, 62.0 HRC at 175°C temper, 61 HRC at 190°C and 205°C temper, 60 HRC at 230°C temper, 59.5 HRC at 260°C temper, 58.5 HRC at 315°C temper. Oil quenched from 800°C, tempered for 1 hour.
Hardness, Vickers	819	819	Converted from Rockwell C hardness.
Bulk Modulus	160 GPa	23200 ksi	Typical for steels.
Machinability	130 %	130 %	Based on 100% machinability for 1% carbon tool steel.
Shear Modulus	80.0 GPa	11600 ksi	Typical for steels.

Thermal Properties	Metric	English	Comments
CTE, linear	12.48 µm/m-°C @Temperature 25.0 - 250 °C	6.933 µin/in-°F @Temperature 77.0 - 482 °F
	12.86 µm/m-°C @Temperature 25.0 - 300 °C	7.144 µin/in-°F @Temperature 77.0 - 572 °F

Processing Properties	Metric	English	Comments
Processing Temperature	175 - 315 °C	347 - 599 °F	Tempering Temperature
	790 - 815 °C	1450 - 1500 °F	Hardening Temperature
Annealing Temperature	765 - 790 °C	1410 - 1450 °F

Component Elements Properties	Metric	English	Comments
Carbon, C	1.25 - 1.55 %	1.25 - 1.55 %
Chromium, Cr	<= 0.30 %	<= 0.30 %
Iron, Fe	96 %	96 %	As Balance
Manganese, Mn	0.70 %	0.70 %
Molybdenum, Mo	0.25 %	0.25 %
Phosphorus, P	<= 0.030 %	<= 0.030 %
Silicon, Si	1.03 %	1.03 %
Sulfur, S	<= 0.030 %	<= 0.030 %

References for this datasheet.

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MSTO6A / 14104

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