Goldman downgrades U.S. Steel and Nucor, says steel prices may soon roll over

Bundles of steel from Nucor Corp. sit for sale to at Thompson Building Materials in Lomita, California, U.S., on Thursday, Aug. 30, 2012.
Patrick Fallon | Bloomberg | Getty Images

Some of the biggest stocks in steel industry could struggle going forward as a price jump for the commodity reverses course, according to Goldman Sachs.