AISI Type A4 Tool Steel

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AISI Type A4 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 A4, UNS T30104, ASTM A681, FED QQ-T-570
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Physical Properties	Metric	English	Comments

Density	8.03 g/cc	0.290 lb/in³	(A6)

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell C	63	63	as air quenched from 845°C, 61 HRC at 150°C temper, 60 HRC at 205°C temper, 59 HRC at 260°C temper, 58 HRC at 315°C temper, 57 HRC at 370°C temper, 56 HRC at 425°C temper, 54 HRC at 480°C temper, 53 HRC at 540°C temper, 50 HRC at 595°C temper, 40 HRC at 650°C temper.
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.

Component Elements Properties	Metric	English	Comments
Carbon, C	0.95 - 1.05 %	0.95 - 1.05 %
Chromium, Cr	0.90 - 2.2 %	0.90 - 2.2 %
Iron, Fe	92.6 - 95.4 %	92.6 - 95.4 %	as remainder
Manganese, Mn	1.8 - 2.2 %	1.8 - 2.2 %
Molybdenum, Mo	0.90 - 1.4 %	0.90 - 1.4 %
Phosphorus, P	<= 0.030 %	<= 0.030 %
Silicon, Si	<= 0.50 %	<= 0.50 %
Sulfur, S	<= 0.030 %	<= 0.030 %

References for this datasheet.

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MSTA4A / 14097

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