square hollow tube square hollow tube been in this line many square hollow tube square hollow tube square hollow tube square hollow tube(good quality)(1)Welded cold formed square steel pipe (2)OD:15*20-600*600mm (3)W.T.:2-25mm (4)standard: GBT 6728-2002Square steel pipe (1)Standard:DIN EN 10210,DIN EN 10219,ASTMA500,GB/T 3094-2000,GB/T 6728-2002,GB/T 178-2005,JIS G 3466(2)Material:20#,Q195,Q235,Q345,St 52,St 37,St 44,S355 JO H,S235 JR H(3)OD:15*15mm-600*600mm(4)W.T.:0.9mm-25mm(5)Length:As customer's requirement(6)Packing: standard export packing in bundles(7)Surface:hot dipped galvanized,Oiled or black painted to prevent rustWe can produce other specifications according to customers requirements.

ODmm)	W.T.(mm)	OD(mm)	W.T.(mm)	OD(mm)	W.T.(mm)	OD(mm)	W.T.(mm)
25*25	1.5	30*30	1.5	40*40	1.5	50*50	1.5
	1.7-1.8		1.7-1.8		1.7-1.8		1.7-1.8
	2		2		2		2
	2.2		2.2		2.2		2.2
	2.5-2.75		2.5-2.75		2.5-3.75		2.5-3.75
60*60	1.5	70*70	1.5	75*75	1.5	80*80	1.5
	1.7-1.8		1.7-1.8		1.7-1.8		1.7-1.8
	2		2		2		2
	2.2		2.2		2.2		2.2
	2.5-2.75		2.5-2.75		2.5-2.75		2.5-2.75
100*100	1.5	120*120	1.5
	1.7-1.8		1.7-1.8
	2		2
	2.2		2.2
	2.5-2.75		2.5-2.75

square hollow tube(good quality)