ПРОГРЕСС
Круглая, квадратная и прямоугольная труба: Какая форма вам действительно нужна?
Круглая, квадратная и прямоугольная труба: Какая форма вам действительно нужна?
Tube selection starts with the shape, not the material. Круглый, square and rectangular hollow sections all carry load, but they do it differently, look different, and cost different amounts. Most buyers default to round tube by habit; that is rarely the right choice for furniture, frames or architecture.
Round Tube: The Default for Pressure and Structure
Round tube has equal strength in every direction, distributes internal pressure evenly, and has the lowest drag for fluids. It is the correct choice for piping, поручни, columns and any application where load comes from all sides. Seamless round is the default for pressure — see our 20# бесшовная труба. Welded round is cheaper for conveyance and structural use — see our Сварная труба Q235B и 304 сварная труба.
Квадратная трубка: The Choice for Frames and Clean Look
Square tube has flat sides that sit flush against panels and plates. It is the standard for machine frames, стеллажи, furniture posts, sign frames and fence posts. A square tube welded to a plate makes a cleaner joint than a round tube because only four fillet welds are needed instead of curved contact. Our range includes GI квадратная трубка, Q235B квадратная труба и 304 square tube.
Прямоугольная трубка: Flat Faces for Bending and Mounting
Rectangular tube has one strong axis and one weak axis. It is the choice when you want a slim profile that is strong in bending (like a lintel, a beam or a handrail cross-section). Rectangular tube also mounts flush against walls and floors better than round. Use it horizontally where bending load dominates.
Side-by-Side Comparison
| Форма | Сила | Расходы | Лучшее для |
|---|---|---|---|
| Круглый | Best in all directions | Середина | Pressure, перила, столбцы |
| Квадрат | Хороший, equal axes | Середина | Рамки, posts, мебель |
| Прямоугольный | Strong one axis | Середина | Beams, lintels, slim profiles |
Specifying Hollow Sections
For round: give OD × wall × length (например. 60.3 × 3.91 × 6000 мм). For square: give outer dimension × wall × length (например. 50 × 50 × 3.0). For rectangular: give width × height × wall. Also state material (Q235B / Q355B / 304 / 316л), стандартный (АСТМ А500 / В 10219 / ГБ), and surface (черный / оцинкованный / 2Б).
