2[(a-d-2r+π(r+d/2)/2+(b-d-2r+π(r+d/2)/2]x7.85d(kg)

a, b are the length and width of the rectangular tube (m), r is the arc radius of the four corners of the tube cavity (m), d is the wall thickness (mm)

Answers

• 
  We plan to import steel bars to Vietnam. Are there any restrictions on importing steel bars from your country at present? 26/11/2025 17:42:27
• 
  How to Remove Rust from Steel Pipes 21/11/2025 13:22:53
• 
  Why is there such a large price difference for stainless steel pipes? 20/11/2025 04:27:51
• 
  We plan to purchase a batch of hot-dip galvanized steel sheets. Given that our previous suppliers failed to meet our material performance requirements, we have strict standards for the corrosion resistance, galvanized layer quality, and processing performance of the sheets this time. Can you provide a detailed material certificate that meets the relevant standards to ensure that the chemical composition and mechanical properties are up to standard? Can you guarantee the bending performance? We need to confirm that when the sheet metal is processed at a specific bending radius, there will be no zinc layer peeling or micro-cracks. 18/11/2025 17:43:19
• 
  Why should an arch be reserved during the construction of corrugated culverts? 14/11/2025 11:38:05