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2203 astm a36 square bar products are offered for sale by suppliers on Alibaba.com, of which steel round bars accounts for 45%, steel square bars accounts for 18%. A wide variety of astm a36 square bar options are available to you, such as cutting, bending and welding.You can also choose from astm, aisi and jis astm a36 square bar,as well as from hot rolled, cold drawn, and cold rolled astm a36 square bar, and whether astm a36 square bar is black, galvanized, or polish.