A681 Type H12 T20812 - ASTM A681-2024

Grade	A681 Type H12
USA UNS	T20812
AISI American Iron and Steel Institute	H12
Corresponding Standard	ASTM A681-2024 Tool Steels Alloy
Classification	Tool Steel

A681 Type H12 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo	W	V	More
Minimum Value	0.3	0.8	0.2	-	-	4.75	1.25	1	0.2	Ni+Cu≤0.75
Maximum Value	0.4	1.25	0.6	0.03	0.03	5.5	1.75	1.7	0.5	Ni+Cu≤0.75

A681 Type H12 Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
condition of delivery	Annealing	BHN ≤235
condition of deliver	Cold Drawing	BHN ≤262
specimen	Preheat at 788±14 ℃, heat at 1010±5.6℃(controllable atmosphere) or 996℃(salt bath), hold for 5 to 15 min, air cool. Temper at 552±5.6℃ twice, each time for 2 h	HRC ≥53

1 Approximate Comparison Table Hot Work Tool Steel

China		United States	International Organization for Standardization
GB	ISC	ASTM	ISO
4Cr5MoWVSi	T23324	H12	X35CrWMoV 5

2 Approximate Comparison Table Hot Work Tool Steel

Japan	United States		Germany		France	European Standard		Russia	United Kingdom
JIS	ASTM	UNS	DIN EN/DIN	W-Nr.	NF EN/NF	EN	Numerical Grade	GOST	BS EN/BS
SDK62 SDK7	H10 H12	T20810	30CrMoV12 45WCrV7 X30WCrV5-3 X30WCrV9-3 X32CrMoV3-3	1.2365	32CDV12-28 32CrMoV12-28 Z35CWDV5	30CrMoV12-11 30CrNiMo8 32CrMoV12-28	- 1.6580 1.2365	3Х3М3Ф 3KH3M3F	2365 BH10 BH12

3 Approximate Comparison Table Alloy Tool Steel 3

A681TypeH12 Corresponding Standards(Same grade name, different standards)

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