A681 Type H21 T20821 - ASTM A681-2024

Grade	A681 Type H21
USA UNS	T20821
AISI American Iron and Steel Institute	H21
Corresponding Standard	ASTM A681-2024 Tool Steels Alloy
Classification	Tool Steel

A681 Type H21 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	W	V	More
Minimum Value	0.26	0.15	0.15	-	-	3	8.5	0.3	Ni+Cu≤0.75
Maximum Value	0.36	0.5	0.4	0.03	0.03	3.75	10	0.6	Ni+Cu≤0.75

A681 Type H21 Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
condition of delivery	Cold Drawing	BHN ≤262
condition of delivery	Annealing	BHN ≤235
specimen	Preheat at 788±14 ℃, heat at 1191±5.6℃(controlled atmosphere) or 1177℃(salt bath), hold for 5 to 15 min air cool. Temper twice at 552±5.6℃, each time for 2 h	HRC ≥52

1 Approximate Comparison Table Hot Work Tool Steel

China		Japan	United States	International Organization for Standardization
GB	ISC	JIS	ASTM	ISO
3Cr2W8V	T23273	SKD 5	H21	X30WCrV 9-3

2 Approximate Comparison Table Hot-Work Tool Steels

China	Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	BS EN/BS
3Cr2W8V	SKD5	H21	X30WCrV9-3	X30WCrV9-3	Z30WCV9	X30WCrV9-3	1.2581	3KH2V8F	BH21

A681TypeH21 Corresponding Standards(Same grade name, different standards)

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!