A681 Type H19 T20819 - ASTM A681-2024

Grade	A681 Type H19
USA UNS	T20819
AISI American Iron and Steel Institute	H19
Corresponding Standard	ASTM A681-2024 Tool Steels Alloy
Classification	Tool Steel

A681 Type H19 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo	W	V	Co	More
Minimum Value	0.32	0.15	0.2	-	-	4	0.3	3.75	1.75	4	Ni+Cu≤0.75
Maximum Value	0.45	0.5	0.5	0.03	0.03	4.75	0.55	4.5	2.2	4.5	Ni+Cu≤0.75

A681 Type H19 Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
condition of delivery	Cold Drawing	BHN ≤262
condition of delivery	Annealing	BHN ≤241
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 ≥55

A681TypeH19 Corresponding Standards(Same grade name, different standards)

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