1,manufacturer of square and rectangular steel pipe 2,ISO, CE 3,best price ... and quick delivery 4,good service NAME: ASTM A500 rectangular & square steel pipe/tubeSTANDARD: ASTM A500, ASTM A53, BS EN 10219 ... ; SS400; A500 gr a/b/c, A53 gr a/bSIZE: square 15*15-400*400mm *0.6-25mm rectangular: 10*20 ... : 10-30 days according to quantityMOQ: 10MT astm a500 rectangular & square structural tube/pipe