Tata International Ltd, the business gateway of Tata Group, on Wednesday opened two new overseas offices at Istanbul, Turkey and Montevideo, Uruguay aimed at developing sources for steel trading and to market steel products across the world. The aim of setting up an office in Istanbul is to market steel products in Greece, Bulgaria, Egypt and North African countries, while that at Montevideo is to explore export options through Mercosur, Tata International said in a release here on Wednesday. Mercado Commun del Sur, or Mercosur, is a trade agreement signed by Argentina, Brazil, Paraguay and Uruguay.