AISI Type A9 Tool Steel

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AISI Type A9 Tool Steel
Categories:	Metal; Ferrous Metal; Tool Steel; Air-Hardening Steel; Cold Work Steel
Material Notes:	Higher shock resistance, but lower wear resistance than other air-hardened tool steels. 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 gauges.
Key Words:	UNS T30109, ASTM A681, FED QQ-T-570
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Physical Properties	Metric	English	Comments

Density	7.78 g/cc	0.281 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	662	662	Converted from Rockwell C hardness.
Hardness, Rockwell C	57	57	tempered at 500°C
Hardness, Vickers	641	641
Tensile Strength, Ultimate	2200 MPa	319000 psi	tempered at 500°C
Tensile Strength, Yield	1780 MPa	258000 psi	tempered at 500°C
Elongation at Break	5.0 %	5.0 %	in 50 mm; tempered at 500°C
Izod Impact	18.0 J	13.3 ft-lb	smooth bar; tempered at 500°C

Thermal Properties	Metric	English	Comments
CTE, linear	12.0 µm/m-°C	6.67 µin/in-°F

Processing Properties	Metric	English	Comments
Processing Temperature	510 - 620 °C	950 - 1150 °F	Tempering Temperature
	980 - 1025 °C	1800 - 1877 °F	Hardening Temperature
Annealing Temperature	845 - 870 °C	1550 - 1600 °F

Component Elements Properties	Metric	English	Comments
Carbon, C	0.45 - 0.55 %	0.45 - 0.55 %
Chromium, Cr	4.75 - 5.5 %	4.75 - 5.5 %
Iron, Fe	87.3 - 90.5 %	87.3 - 90.5 %	As Balance
Manganese, Mn	<= 0.50 %	<= 0.50 %
Molybdenum, Mo	1.3 - 1.8 %	1.3 - 1.8 %
Nickel, Ni	1.25 - 1.75 %	1.25 - 1.75 %
Phosphorus, P	<= 0.030 %	<= 0.030 %
Silicon, Si	0.95 - 1.15 %	0.95 - 1.15 %
Sulfur, S	<= 0.030 %	<= 0.030 %
Vanadium, V	0.80 - 1.4 %	0.80 - 1.4 %

References for this datasheet.

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