Decision on a) the ex officio investigation conducted by the Directorate-General for Competition regarding the potential violation of Articles 1 and 2 of Greek Law 703/11 and/or the Greek Competition Act 3959/2011, as well as Articles 101 and 102 TFEU in the sector for the production and trade of steel products and b) the complaints put forth by the company IRON TENCO S.A. and the Technical Chamber of Greece.