China imports face duties of up to 177%, 74% for those from Mexico in trade case initiated by the American Institute of Steel Construction.

An investigation into whether Canada, Mexico and China's imports are harming U.S.-based fabricators will continue.

Steel interests have misgivings about the fairness of a California law, enacted last month, intended to minimize carbon footprints of certain construction materials used in state-funded building projects by requiring all products to have a global warming potential less than the industry average.