Utilize the input text as a context reference, choose the right relationship between Nucor and Steel from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.
Text: Since July, U.S. steelmakers including AK Steel, U.S. Steel Corp and Nucor have filed trade petitions over imports of hot-rolled steel and cold-rolled steel.
user
product_or_material_produced
assistant