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hot sale mild steel square tube for construction application from shanghai supplier of china, US $ 350 - 450 / Ton, AiSi, ASTM, bs, DIN, GB, JIS, A36,ST37-2, A36, S235JRG1, Q235, Q345 etc., Q235, Q345 ,ASTM A36,S235JR,St37-2,Q345B,S355JR, Shanghai, China.Source from Shanghai Shunyun Industry Co., Lt