The selection of square and rectangular pipes should be determined by comprehensively considering specifications, wall thickness and material based on load-bearing requirements and usage scenarios.
Specification Selection
Square pipe: 20×20 ~ 200×200mm, common 50×50, 100×100, etc.
Rectangular pipe: 20×30 ~ 150×200mm, e.g. 100×50, 150×100, etc.
Choose appropriate cross-section size based on load and span
Wall Thickness
Common wall thickness: 1.5-5.0mm, heavy load structural parts should choose thicker wall
Too thin wall affects load-bearing and welding quality; too thick wall increases cost
Material
Q235B: common carbon structural steel, meeting general load-bearing requirements
Q355B: high-strength low-alloy steel, suitable for heavy load or important structural parts
Special scenarios can choose stainless steel, weathering steel, etc.
Selection Suggestions
Clarify the load-bearing requirements and span, determine the section size according to the bending moment, and determine the wall thickness and material according to the load-bearing capacity, so as to achieve economic and reasonable selection.