Square Steel Pipe : 1. More Thickness: 3.0-22. ... corrosive Treatment.4. TECHINQUE:Hot rolled, Cold rolled, ERW, High-frequency welded.5. APPLICATION:(1).Machinery manufacture: glass machinery, ... , container, tricycle, tower crane.6. SPECIFICATION: SQUARE TUBE(MM) THICKNESS (MM)SQUARE TUBE (MM)THICKNESS(MM)15*151.0-2 ... .Perfect after-sale service to solve your worries. High Quality Square steel pipe