AISI Type A2 Tool Steel

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AISI Type A2 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 A2, UNS T30102, ASTM A681, FED QQ-T-570, SAE J437, SAE J438, DIN 1.2363, AFNOR Z 100 CDV 5 (Fr), JIS SKD 12, SS14 2260 (Sweden), B.S. BA 2
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Physical Properties	Metric	English	Comments

Density	7.86 g/cc	0.284 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell C	63 - 65 @Temperature 23.0 °C	63 - 65 @Temperature 73.4 °F	as air-hardened
	42 - 44	42 - 44
	50 - 52	50 - 52
	56 - 58	56 - 58
	58 - 60	58 - 60
	58 - 60	58 - 60
	58 - 60	58 - 60
	58 - 60	58 - 60
	59 - 61	59 - 61
	60 - 62	60 - 62
Modulus of Elasticity	203 GPa	29400 ksi
Bulk Modulus	160 GPa	23200 ksi	Typical for steels.
Poissons Ratio	0.30	0.30	Calculated
Machinability	65 %	65 %	Based on Carbon tool steel.
Shear Modulus	78.0 GPa	11300 ksi	Estimated from elastic modulus

Thermal Properties	Metric	English	Comments
CTE, linear	10.7 µm/m-°C @Temperature 20.0 - 100 °C	5.94 µin/in-°F @Temperature 68.0 - 212 °F
	12.0 µm/m-°C @Temperature 20.0 - 200 °C	6.67 µin/in-°F @Temperature 68.0 - 392 °F
	12.7 µm/m-°C @Temperature 20.0 - 300 °C	7.06 µin/in-°F @Temperature 68.0 - 572 °F
	13.2 µm/m-°C @Temperature 20.0 - 400 °C	7.33 µin/in-°F @Temperature 68.0 - 752 °F
	13.7 µm/m-°C @Temperature 20.0 - 500 °C	7.61 µin/in-°F @Temperature 68.0 - 932 °F
	14.0 µm/m-°C @Temperature 20.0 - 600 °C	7.78 µin/in-°F @Temperature 68.0 - 1110 °F
	14.3 µm/m-°C @Temperature 20.0 - 700 °C	7.94 µin/in-°F @Temperature 68.0 - 1290 °F
	14.4 µm/m-°C @Temperature 20.0 - 750 °C	8.00 µin/in-°F @Temperature 68.0 - 1380 °F

Processing Properties	Metric	English	Comments
Processing Temperature	175 - 540 °C	347 - 1000 °F	Tempering Temperature
	925 - 980 °C	1700 - 1800 °F	Hardening Temperature
Annealing Temperature	845 - 870 °C	1550 - 1600 °F

Component Elements Properties	Metric	English	Comments
Carbon, C	0.95 - 1.05 %	0.95 - 1.05 %
Chromium, Cr	5.13 %	5.13 %
Iron, Fe	91 %	91 %	As Balance
Manganese, Mn	<= 1.0 %	<= 1.0 %
Molybdenum, Mo	1.15 %	1.15 %
Phosphorus, P	<= 0.030 %	<= 0.030 %
Silicon, Si	<= 0.50 %	<= 0.50 %
Sulfur, S	<= 0.030 %	<= 0.030 %
Vanadium, V	0.33 %	0.33 %

References for this datasheet.

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MSTA2A / 14095

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