According to Specification 14-115-43-97

Mass fraction of key elements, % :

V : 48-60
Mn : 5.0 maximum
Si : 2.0 maximum
C : 0.60 maximum
Cu : 0.2 maximum
As : 0.02 maximum
Al : 0.3 maximum
P : 0.10 maximum
S : 0.03 maximum

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