Conformity Certificate No. RU.MCC.305.1020.4.ПР.22543 dd. April 19th, 2011, issued by certification body «Mosekspertstroysertifikatsiya» for rebars manufacturing, thermomechanically welded deformed bars of A500C class for concrete structures reinforcement production (medium section of nom. diam. 28 mm-40 mm) of Ст4пс, Ст4сп steel grades in conformity with GOST Р 52544-2006 requirements.