Tenaris looks okay, you should keep it.
The reason everything is down right now, is that the broader market has crashed from Dow 14000 a year ago to 8000 now.
Tenaris has an earnings report on November 6 http://biz.yahoo.com/research/earncal/t/ts.html
you can add this page to favorites if you want to check different earnings dates: http://biz.yahoo.com/research/earncal/today.html