Verhältnis Frequenz-geschweißten Stahlrohr

Ratio-frequency welded steel tube 1)Specification: Square steel tube:20*20,25*25,30*30,40*40,50*50 Rectangle steel tube:10*20,13*26,15*30,15*35,20*30,20*40,25*50,30*50 Irregular steel tube:22*68,25*62,30*68,25*70,20*40,25*50,25*68,15*30,27*100,25*110,38*78, 40*98,50*80,25*68,28*78,47*98,,55*100,60*85,65*55,65*62,68*50,70*63, 76*54,25*78,D36,D40,D43,D50,D58 2)Material:Q195steel 3)Lower price and high quality 4)Many kinds of purpose (pipes for furniture ,pipeline and radiator) 5)Surface:oiled or black painted in order to prevent rust.