Steel with 0.12% C and 0.5%Mn and 2% Si and 0.2% Cr is belonged to which group of steels?

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Gordon Chirgwin

Your Silicon content is 2%. According to the AWS formula, the Carbon Equivalence is well over 0..50%.

Belma Fakić

you have 0,2%Cr which have big affinity to C and make carbides. And you have to check heat treatment of that ring.

Rasoul Sadeghi

I want to know what kind of steel is it

It is a high silicon steel.