Conformity Certificate No. RU.MCC.305.1020.4.ПР.22543 dd. April 19^th, 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.