AISI Type A7 Tool Steel

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AISI Type A7 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 gauges.
Key Words:	AISI Medium-Alloy, Air-Hardening Tool Steels A7, UNS T30107, ASTM A681, FED QQ-T-570
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Physical Properties	Original Value	Comments

Density	7.66 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	58 - 66
	65 - 66.5	as air quenched from 955°C
	44 - 46 @Tempering Temp. 650 °C, Time 10800 sec	air quenched from 955°C then tempered for 3 hours
	53 - 55 @Tempering Temp. 595 °C, Time 10800 sec	air quenched from 955°C then tempered for 3 hours
	56 - 58 @Tempering Temp. 540 °C, Time 10800 sec	air quenched from 955°C then tempered for 3 hours
	59 - 61 @Tempering Temp. 425 °C, Time 10800 sec	air quenched from 955°C then tempered for 3 hours
	61 - 63 @Tempering Temp. 315 °C, Time 10800 sec	air quenched from 955°C then tempered for 3 hours
	62 - 64 @Tempering Temp. 260 °C, Time 10800 sec	air quenched from 955°C then tempered for 3 hours
	64 - 65 @Tempering Temp. 150 °C, Time 10800 sec	air quenched from 955°C then tempered for 3 hours
Bulk Modulus	160 GPa	Typical for steels.
Machinability	65 %	Based on Carbon tool steel.
Shear Modulus	80.0 GPa	Typical for steels.

Thermal Properties	Original Value	Comments
CTE, linear	12.0 µm/m-°C

Processing Properties	Original Value	Comments
Processing Temperature	150 - 540 °C	Tempering Temperature
	955 - 980 °C	Hardening Temperature
Annealing Temperature	870 - 900 °C

Component Elements Properties	Original Value	Comments
Carbon, C	2.0 - 2.85 %
Chromium, Cr	5.38 %
Iron, Fe	84 %	As Balance
Manganese, Mn	<= 0.80 %
Molybdenum, Mo	1.15 %
Phosphorus, P	<= 0.030 %
Silicon, Si	<= 0.50 %
Sulfur, S	<= 0.030 %
Tungsten, W	1 %	Optional
Vanadium, V	4.53 %

References for this datasheet.

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MSTA7A / 14100

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