A681 Type S1 T41901 - ASTM A681-2024

Grade	A681 Type S1
USA UNS	T41901
AISI American Iron and Steel Institute	S1
Corresponding Standard	ASTM A681-2024 Tool Steels Alloy
Classification	Tool Steel

A681 Type S1 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo	W	V	More
Minimum Value	0.4	0.15	0.1	-	-	1	-	1.5	0.15	Ni+Cu≤0.75
Maximum Value	0.55	1.2	0.4	0.03	0.03	1.8	0.5	3	0.3	Ni+Cu≤0.75

A681 Type S1 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 954±5.6℃(controllable atmosphere) or 941℃(salt bath), hold for 5 to 15 min, oil cool. Temper at 204±5.6℃ once for 2 h	HRC ≥56

1 Approximate Comparison Table Alloy Cold-Work Tool Steel

China	United States	International Organization for Standardization	Germany	France	European Standard		Russia	United Kingdom
GB	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	BS EN/BS
6CrW2Si	S1	60WCrV8	60WCrV7	55WC20	60WCrV8	1.2550	5KHV2S	BS1

2 Approximate Comparison Table Alloy Tool Steel 1

China		United States		International Organization for Standardization	Germany		France	Russia	Sweden	United Kingdom
GB	ISC	ASTM	UNS	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	GOST	SS	BS EN/BS
5CrW2Si	T40125	S1	T41901	50WCrV8	≈45WCrV7	1.2542	50WCrV8	5ХВ2С	~2710	50WCrV8 BS1

A681TypeS1 Corresponding Standards(Same grade name, different standards)

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