A681 Type O1 T31501 - ASTM A681-2024

Grade	A681 Type O1
USA UNS	T31501
AISI American Iron and Steel Institute	O1
Corresponding Standard	ASTM A681-2024 Tool Steels Alloy
Classification	Tool Steel

A681 Type O1 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	W	V	More
Minimum Value	0.85	0.1	1	-	-	0.4	0.4	-	Ni+Cu≤0.75
Maximum Value	1	0.5	1.4	0.03	0.03	0.7	0.6	0.3	Ni+Cu≤0.75

A681 Type O1 Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
condition of delivery	Cold Drawing	BHN ≤241
condition of delivery	Annealing	BHN ≤212
specimen	Preheat at 649±14 ℃, heat at 802±5.6℃(controllable atmosphere) or 788℃(salt bath), hold for 5 to 15 min, oil cool. Temper at 204±5.6℃ once for 2 h	HRC ≥59

Approximate Comparison Table Alloy Tool Steel 2

A681TypeO1 Corresponding Standards(Same grade name, different standards)

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