Dec 12 - In its steel outlook published today, '2013 Outlook: U.S. Steel Producers,' Fitch Ratings highlights end-use trends, industry characteristics and producer profiles. Fitch expects further credit and operating improvements for U.S. steel producers in 2013 although downside risks from global overcapacity remains. Demand is slowly growing from the auto, energy, and heavy equipment manufacturing segments, while construction has bottomed out. Fitch expects steel demand to continue to grow