A681 Type O1 T31501 - ASTM A681-2008(R2015)

Grade	A681 Type O1
USA UNS	T31501
AISI American Iron and Steel Institute	O1
Corresponding Standard	ASTM A681-2008(R2015) Standard Specification for 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

	Heat Treatment or Condition	Hardness HBW
Bars, Thick Plates, Thin Plates, Strips, Rods, Wires, Forgings	Cold Drawing	BHN ≤241
Bars, Thick Plates, Thin Plates, Strips, Rods, Wires, Forgings	Annealing	BHN ≤212
Bars, Thick Plates, Thin Plates, Strips, Rods, Wires, Forgings	Heat Treatment	HRC ≥59

Approximate Comparison Table Alloy Tool Steel 2

A681TypeO1 Corresponding Standards(Same grade name, different standards)

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