A681 Type O6 T31506 - ASTM A681-2024

Grade	A681 Type O6
USA UNS	T31506
AISI American Iron and Steel Institute	O6
Corresponding Standard	ASTM A681-2024 Tool Steels Alloy
Classification	Tool Steel

A681 Type O6 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo	More
Minimum Value	1.25	0.55	0.3	-	-	-	0.2	Ni+Cu≤0.75
Maximum Value	1.55	1.5	1.1	0.03	0.03	0.3	0.3	Ni+Cu≤0.75

A681 Type O6 Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
condition of delivery	Cold Drawing	BHN ≤241
condition of delivery	Annealing	BHN ≤229
specimen	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

A681TypeO6 Corresponding Standards(Same grade name, different standards)

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