According to Specification 14-115-43-97

Mass fraction of key elements, % :

V - 35-48
Mn - 4.0 maximum
Si - 2.0 maximum
C - 0.75 maximum
Cu - 0.4 maximum
As - 0.03 maximum
Al - 0.5 maximum
P - 0.10 maximum
S - 0.05 maximum

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