A681 Type A4 T30104 - ASTM A681-2024

Grade	A681 Type A4
USA UNS	T30104
AISI American Iron and Steel Institute	A4
Corresponding Standard	ASTM A681-2024 Tool Steels Alloy
Classification	Tool Steel

A681 Type A4 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo	More
Minimum Value	0.95	0.1	1.8	-	-	0.9	0.9	Ni+Cu≤0.75
Maximum Value	1.05	0.7	2.2	0.03	0.03	2.2	1.4	Ni+Cu≤0.75

A681 Type A4 Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
condition of delivery	Cold Drawing	BHN ≤262
condition of delivery	Annealing	BHN ≤241
specimen	Preheat at 677±14 ℃, heat at 857±5.6℃(controlled atmosphere) or 843℃(salt bath), hold for 5 to 15 min, air cool. Temper at 204±5.6℃ once for 2 h	HRC ≥61

A681TypeA4 Corresponding Standards(Same grade name, different standards)

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