1.   All these things require steel as a basic component.

2.   Strong sales of light trucks, which require more steel, are cushioning the automotive downturn.

3.   The move comes as automakers and appliance companies expand operations in Mexico, requiring more steel and more warehouse space, Pittsburgh-based U.S. Steel said.

4.   The new system is cheaper, because it requires less steel, and also allows for easy drilling farther out to sea.