Standards
GOST 27772-2015
Rolled products for structural steel constructions
Strength classes С235–С590 for building structures, used with SP 16.13330.
Replaced GOST 27772-88 in 2016 and is referenced by SP 16.13330 (NormaCS). Check whether a later edition applies to your project.
Official page9 values on this site name a clause of this document.