Nucor Corporation is a producer of steel and related products headquartered in Charlotte, North Carolina. It is the largest steel producer in the United States of America and is the largest "mini-mill" steelmaker (i.e. it uses electric arc furnaces to melt scrap steel as opposed to blast furnaces to melt iron). Nucor is North America's largest recycler of any material and recycled 16.9 million tons of scrap in 2015. None of Nucor's facilities is unionized.