Tubi rettangolari in acciaio inossidabile

Stainless Steel Rectangular Tubing is a hollow structural section with a rectangular cross-section, ampiamente utilizzato in costruzione, industrial machinery, automobilistico, mobilia, e applicazioni architettoniche.
Its manufacturing process is designed to ensure alta resistenza, precisione dimensionale, resistenza alla corrosione, e qualità della superficie.

Unlike round tubes, rectangular tubing requires precise forming and finishing techniques to maintain flat walls and sharp corners.

Manufacturing Process of Stainless Steel Rectangular Tubing

1. Selezione dei materiali

• High-quality stainless steel sheets or coils are selected, tipicamente gradi 304, 304l, 316, or 316L.

• Chemical composition and thickness are checked for uniformity and corrosion resistance.

2. Tosatura

• Stainless steel sheets are cut to the required width and length for forming into rectangular tubes.

• Precision cutting ensures minimal material waste and accurate dimensions.

3. Formare

Rectangular tubing is formed using one of the following processes:

• Formatura a rullo:

  • The flat sheet is passed through successive rollers that gradually bend it into a rectangular shape.

  • The edges are then prepared for welding.

• Mandrel or Press Forming:

  • For seamless-style rectangular tubing, the tube is shaped using a mandrel or press die to achieve precise corners and wall thickness.

4. Saldatura (for ERW Tubes)

• Electric Resistance Welding (ACRI) is commonly used for rectangular tubes.

• The edges of the formed sheet are welded along the seam using high-frequency current, producing a strong, uniform joint.

• Post-weld, the tube may undergo grinding or polishing to remove weld marks and restore smooth surface quality.

5. Trattamento termico

• Tubing may be solution-annealed to relieve internal stress and enhance corrosion resistance.

• Annealing also improves ductility and dimensional stability.

6. Sizing and Straightening

• Tubes are passed through sizing rolls or stretchers to achieve precise larghezza, height, spessore della parete, and squareness.

• Straightening ensures the tube is flat and free of bends or twists.

7. Finitura superficiale

• Common finishes include finitura al mulino, spazzolato (raso), or polished (specchio).

• Pickling and passivation may be applied to remove scale and improve corrosion resistance.

8. Cutting and Inspection

• Tubes are cut to lunghezze standard o personalizzate.

• Quality checks include spessore della parete, dimensional tolerances, corner squareness, straightness, e finitura superficiale.

Advantages of Stainless Steel Rectangular Tubing

• Uniform wall thickness and consistent mechanical properties

• Forte, flat surfaces for structural or architectural use

• Elevata resistenza alla corrosione

• Excellent weldability and formability

• Disponibile in various dimensions and surface finishes