Shares of U.S. Steel Corp. rallied 1.1% in premarket trading Friday, after the steel producer provided an upbeat third-quarter outlook, including a “significantly better” performance expected for its flat-rolled business and signs that the tubular business has bottomed. The company said it an adjusted per-share loss of $1.45, compared with the FactSet loss consensus of $1.52. “Improving market conditions experienced in June and July have accelerated through August and September,” said Chief Executive David Burritt. “We have grown confident in the recovery that is underway in North America and Europe,” he said. The stock has dropped 26.3% year to date through Thursday, while the Dow Jones Industrial Average has slipped 2.2%.