Kunibert Albert Martin

Vallourec & Mannesmann Tubes SA manufactures seamless hot-rolled steel tubes. The firm's products include feedwater heater tubes, circular hollow sections, and piping components. The company provides services to the automotive, construction & civil engineering, mechanical engineering, and oil & gas industries. It was founded in October 1997 and is headquartered in Boulogne, France.

Borusan Mannesmann Boru Yatirim Holding AS manufactures, markets and distributes steel pipes. It specializes in pipes for the transmission of water, natural gas, and oil, as well as precision tubing, boiler tubes, PE and bitumen-coated steel and polypropylene sanitary pipes, and heavy-duty construction profiles. The company was founded in 1998 and is headquartered in Istanbul, Turkey.