A681 Type S4 T41904 - ASTM A681-2024

Grade	A681 Type S4
USA UNS	T41904
AISI American Iron and Steel Institute	S4
Corresponding Standard	ASTM A681-2024 Tool Steels Alloy
Classification	Tool Steel

A681 Type S4 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	V	More
Minimum Value	0.5	1.75	0.6	-	-	0.1	0.15	Ni+Cu≤0.75
Maximum Value	0.65	2.25	0.95	0.03	0.03	0.5	0.35	Ni+Cu≤0.75

A681 Type S4 Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
condition of delivery	Cold Drawing	BHN ≤255
condition of delivery	Annealing	BHN ≤229
specimen	Preheat at 677±14 ℃, heat at 899±5.6℃(controllable atmosphere) or 885℃(salt bath), hold for 5 to 15 min, oil cool. Temper at 204±5.6℃ once for 2 h	HRC ≥58

A681TypeS4 Corresponding Standards(Same grade name, different standards)

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