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435 manufacturer mild steel square bar products are offered for sale by suppliers on Alibaba.com, of which steel square bars accounts for 16%. A wide variety of manufacturer mild steel square bar options are available to you, such as cutting, bending and welding.You can also choose from astm, aisi and jis manufacturer mild steel square bar,as well as from hot rolled, cold drawn, and cold rolled manufacturer mild steel square bar, and whether manufacturer mild steel square bar is black, galvanized, or polish.