Tenaris SA, Luxembourg, (NYSE: TS) has closed its acquisition of Hydril Co., Houston, (Nasdaq: HYDL) for US$97 per share in a deal valued at US$2.16 billion in cash. The acquisition follows Tenaris' purchase last fall of U.S.-based Maverick Tube Corp. Hydril manufactures connections and pressure-control products for oil and gas drilling and production. In 2006, it had revenues of US$503 million, operating income of US$132.2 million and net income of US$91.3 million. Tenaris is a global manufacturer and supplier of tubular products and services for the oil and gas industry worldwide.