China Steel Tube, China Steel Tube Manufacturers and young black tube square iron bar q345b steel hollow section
prime quality square steel tube/ms square steel tube commodity square steel tube O. T 2-18mm length 3-12m or according to per request material Q195—Grade B, SS330, SPC, S185 Q215—Grade C,CS Type B, SS330, SPHC Q235---Grade D, SS400, S235JR, S235JO, S235J2 Q345---SS500, ST52, ST37 10#,20#,45#, etc Surface treatment 1, Oiled 2, Galvanized 3, Painting black
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