A681 Type H42 T20842 - ASTM A681-2024

Grade	A681 Type H42
USA UNS	T20842
AISI American Iron and Steel Institute	H42
Corresponding Standard	ASTM A681-2024 Tool Steels Alloy
Classification	Tool Steel

A681 Type H42 Chemical Element Composition Content (%)

Component	C ^*	Si	Mn	P	S	Cr	Mo	W	V	More
Minimum Value	0.5	0.2	0.15	-	-	3.75	4.5	5.5	1.75	Ni+Cu≤0.75
Maximum Value	0.7	0.45	0.4	0.03	0.03	4.5	5.5	6.75	2.2	Ni+Cu≤0.75

*Available in several carbon ranges.

A681 Type H42 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 1204±5.6℃(controllable atmosphere) or 1191℃(salt bath), hold for 5 to 15 min,air cool. Temper twice at 552±5.6℃, each time for 2 h	HRC ≥60

A681TypeH42 Corresponding Standards(Same grade name, different standards)

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