方管 規格表
2種規格資料
方管是正方形和矩形截面的閉合截面鋼管，比開口截面型鋼具有更優的抗扭剛度。廣泛用於設備框架、大門、儲物結構。易切割和焊接，外觀整潔適合組裝結構。
常見問題 (FAQ)
When should I choose square tube vs. round pipe?
Square tubes simplify flat welding and bolted connections, ideal for structural frames. Round pipes offer equal strength in all directions and better pressure performance. Frames typically use square tubes; piping uses round.
How do I distinguish between square and rectangular tube applications?
Square tubes suit columns and legs needing equal strength in both directions. Rectangular tubes suit beams where higher strength in one direction is needed — orient the long side in the load direction.
How do I select tube wall thickness (t)?
Determine by structural calculation based on load and span. General frames use t2.3–3.2mm; heavy structures use t4.5–6.0mm. Thicker walls mean more strength but also more weight.