Square steel pipes Material: Q195,Q235,16Mn etc. Size: 15*15-600*600mm Thickness: 0.5-16.0mm Square steel pipesMaterial: Q195,Q235,16Mn ... -600*600mmThickness: 0.5-16.0mmAnd also we supply rectangular steel pipe: 30*20-500*300mm. If you have any purchase ... soon!Contact Person: Jeffson ZMobile: 0086-134 7582 9481 Square steel pipes