[MW:2537] GOST 380-88 & GOST 1050-88: Chemical Composition

I am looking for information on the chemical composition of Russia's
Black Steels in the following categories:

Steel Ст3 GOST 380-88

Steel Ст45 GOST 1050-88

Steel Ст20 GOST 1050-88

Thanks!

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