Conformity Certificate No. RU.MCC.305.1020.4.ПР.22542 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 (light section of nom. diam. 8 mm-25 mm) of Ст4пс, Ст4сп steel grades in conformity with GOST Р 52544-2006 requirements (serial production).