AISI Type A8 Tool Steel

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AISI Type A8 Tool Steel
Categories:	Metal; Ferrous Metal; Tool Steel; Air-Hardening Steel; Cold Work Steel
Material Notes:	High hardenability, high degree of dimensional stability in heat treatment, good wear resistance, fatigue life, toughness, and deep hardening qualities. Applications include cold forming, blanking and bending dies, forming rolls, drill bushings, knurling tools, master dies and gages.
Key Words:	AISI Medium-Alloy, Air-Hardening Tool Steels A8, UNS T30108, ASTM A681, FED QQ-T-570
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Physical Properties	Metric	English	Comments

Density	7.87 g/cc	0.284 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell C	48 - 57	48 - 57
Bulk Modulus	160 GPa	23200 ksi	Typical for steels.
Machinability	65 %	65 %	Based on Carbon tool steel.
Shear Modulus	80.0 GPa	11600 ksi	Typical for steels.

Processing Properties	Metric	English	Comments
Processing Temperature	175 - 595 °C	347 - 1100 °F	Tempering Temperature
	980 - 1010 °C	1800 - 1850 °F	Hardening Temperature
Annealing Temperature	845 - 870 °C	1550 - 1600 °F

Component Elements Properties	Metric	English	Comments
Carbon, C	0.50 - 0.60 %	0.50 - 0.60 %
Chromium, Cr	5.13 %	5.13 %
Iron, Fe	90 %	90 %	As Balance
Manganese, Mn	<= 0.50 %	<= 0.50 %
Molybdenum, Mo	1.4 %	1.4 %
Phosphorus, P	<= 0.030 %	<= 0.030 %
Silicon, Si	0.93 %	0.93 %
Sulfur, S	<= 0.030 %	<= 0.030 %
Tungsten, W	1.25 %	1.25 %

References for this datasheet.

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MSTA8A / 14101

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