Salzgitter AG has signed a contract to acquire the Graz and Gratkorn based operations of Kovac Stahl, Graz Austria. Kovac Stahl, which has a workforce of around 130 employees, operates steel trading and steel service center activities at its various locations. With shipments of more than 40,000 tonnes, the company generated sales of approximately EUR 47 million in 2011. Salzgitter AG's Trading Division's…