The unit bought, located in central Romanian town Campina, has some 60 employees.
Other Tenaris properties in Romania include a pipe plant in Zalau, a steel processor in Calarasi and a service center in Ploiesti. The group has some 1,400 employees in Romania.
Cameron operates another production unit in Ploiesti, following an investment of some EUR80 million in 2009.
The Tenaris group entered the Romanian market in 2004 and it plans to invest $150 million locally between 2011 and 2013. The group produces pipes for the oil and gas industry, while also providing connected services for the energy industry.