Nucor Corporation is a Fortune 150 company headquartered in Charlotte, North Carolina, United States. It is the largest steel producer in the United States, and the largest of the "mini-mill" steelmakers (those using electric arc furnaces to melt scrap steel, as opposed to companies operating integrated steel works with blast furnaces). Nucor is North America's largest recycler of any material, recycling one ton of steel every two seconds. The company's total annual steelmaking capacity roughly is 25 million tons. Nucor operates 23 scrap-based steel production mills.