Stockholders of Hydril Company Approve Merger with Tenaris S.A.

  
    
  
  
    
      Hydril Company (NASDAQ:HYDL) announced today that the stockholders of 
      Hydril at a special meeting held on Wednesday May 2, 2007 approved the 
      merger agreement with Tenaris S.A. (NYSE:TS) and the previously 
      announced merger with a subsidiary of Tenaris S.A. Upon consummation of 
      the merger, Hydril will become an indirect, wholly owned subsidiary of 
      Tenaris. The parties expect that the merger will occur on May 7, 2007.
    
    
      Under the terms of the merger agreement, Hydril stockholders will 
      receive $97.00 in cash for each share of Hydril common stock and class B 
      common stock they own. Following the merger, Hydril stockholders will 
      promptly receive letters of transmittal from the paying agent to 
      complete and return with their stock certificates to receive the per 
      share merger consideration.
    
    
      Hydril, headquartered in Houston, Texas, is engaged worldwide in 
      designing, manufacturing and marketing premium connection and pressure 
      control products used for oil and gas drilling and production.