PITTSBURGH - RTI International Metals, one of the largest suppliers of advanced titanium and specialty metal products and services, announced the approval of the merger agreement of RTI by Alcoa Inc. 

RTI previously moved it's headquarters to Pittsburgh, but still has a plant in Niles.  

Alcoa is a global leader in lightweight metals technology, engineering and manufacturing and will receive all outstanding shares of RTI in a stock-for-stock transaction. RTI shareholders will receive about 2.8 Alcoa shares for each RTI share.

At RTI's annual shareholders meeting, more than 94% were in approved the transaction, representing almost 85% of all shares of RTI.

The approval of the merger agreement by RTI shareholders was one of the final conditions set forth in the agreement.

RTI and Alcoa expect the merger to close on July 23, 2015.