A681 Type A9 T30109 - ASTM A681-2024

Grade	A681 Type A9
USA UNS	T30109
AISI American Iron and Steel Institute	A9
Corresponding Standard	ASTM A681-2024 Tool Steels Alloy
Classification	Tool Steel

A681 Type A9 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo	V	More
Minimum Value	0.45	0.95	0.2	-	-	4.75	1.25	1.3	0.8	Ni+Cu≤0.75
Maximum Value	0.55	1.15	0.5	0.03	0.03	5.5	1.75	1.8	1.4	Ni+Cu≤0.75

A681 Type A9 Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
condition of delivery	Cold Drawing	BHN ≤262
condition of delivery	Annealing	BHN ≤248
specimen	Preheat at 788±14 ℃, heat at 1010±5.6℃(controllable atmosphere) or 996℃(salt bath), hold for 5 to 15 min, air cool. Temper twice at 510±5.6℃, each time for 2 h	HRC ≥56

A681TypeA9 Corresponding Standards(Same grade name, different standards)

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