A681 Type P21 T51621 - ASTM A681-2008(R2015)

Grade	A681 Type P21
USA UNS	T51621
AISI American Iron and Steel Institute	P21
Corresponding Standard	ASTM A681-2008(R2015) Standard Specification for Tool Steels Alloy
Classification	Tool Steel

A681 Type P21 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	V	Al	More
Minimum Value	0.18	0.2	0.2	-	-	0.2	3.9	0.15	1.05	Ni+Cu≤0.75
Maximum Value	0.22	0.4	0.4	0.03	0.03	0.3	4.25	0.25	1.25	Ni+Cu≤0.75

Approximate Comparison Table Plastic Mold Steel

A681TypeP21 Corresponding Standards(Same grade name, different standards)

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