RECTANGULAR PIPE

Tianjin Lefin Industrial Co., Ltd is one of the most experienced manufacturers and suppliers of rectangular pipe in China. Please feel free to buy high quality rectangular pipe from our factory. Good service and reasonable price are available.

Dimension: 20mm*30mm - 1500mm*1200mm
Wall Thickness: 1.2mm - 50mm
Length: 1m - 25m, usually 6m/12m, also depends on the requirements
Standard: EN10210, EN10219, ASTMA500, ASTMA501, AS1163, JIS G3466
Grade: S235, S275, S355, S420, S460, GR.A, GR.B, GR.C, GR.D, STK R400, STK R409, C250, C350, C450

Surface Treatment: Coating, Painting, Marking, Drilling holes, Bending, Cutting, Galvanizing, Welding

Application: Buildings and structures, industrial equipment and machinery

Rectangular pipe, also known as rectangular steel pipe or rectangular hollow pipe, is a commonly used steel pipe, its cross-section shape is rectangular, with good pressure resistance, wear resistance, corrosion resistance and other advantages. Rectangular tubes have a wide range of applications in various fields.

It is mainly reflected in the following aspects:

Building structure
• As part of the building frame for support and load bearing.
• Used to make stairs, balconies, railings and other structural components.
Machinery manufacturing
• Frames and support structures for the manufacture of various machinery and equipment.
• As a protective sleeve for the drive shaft or other moving parts.

Automotive Manufacturing
• Used for automotive chassis, body frame and other structural components.
• As a conduit for the exhaust system.

Bridge construction
• Acts as the support structure and beam of the bridge.

Shipbuilding
• For ship hull structure, deck and internal support.

Agricultural machinery
• Used to make frames and components for agricultural machinery.
Furniture Manufacturing
• Frames and support structures for modern furniture.
Sports equipment
• For the production of sports equipment, such as basketball stands, football gates, etc.
Oil and gas industry
• Structural components for conveying pipelines and drilling platforms.
Power industry
• Support structures for power towers and transmission lines.
Decoration and display
• For the production of display stands, billboards, etc.
Industrial piping systems
• For transporting liquid, gas or solid particles.
Steel structure
•In steel construction, rectangular tubes can be used as the main load-bearing and connecting components.

Guardrail and fence
• For making safety guardrail and protective fence.

Logistics and Warehousing
• For the construction of shelving and storage systems.

Summary:
Rectangular tubes have a wide range of applications. First of all, it is widely used in the field of architecture. For example, in the structural support of buildings, rectangular tubes can be used as beams, columns, beams, Bridges and other structural parts, and their stability and strength greatly enhance the stability and safety of buildings.
Secondly, rectangular tubes also have important applications in the field of transportation. For example, in the construction of Bridges, tunnels, roads, urban rail transit, rectangular pipes can be used as support, seismic, sound insulation, heat insulation and other aspects, enhancing the safety and comfort of traffic facilities.
In addition, rectangular tubes can also be used in many fields such as mechanical equipment, aerospace, petrochemical, and electric power. For example, in mechanical equipment, rectangular tubes can be used as frames, columns, supports and other components, improving the durability and stability of mechanical equipment.

Selection of raw materials

The raw materials of rectangular tubes are usually cold-rolled or hot-rolled sheets, and appropriate materials and specifications need to be selected according to the design requirements and the use environment.
Uncoiling

Place the selected sheet on the uncoiling machine and roll it into strips.
Cutting

The strip sheet after uncoiling is cut to make its length adapt to production requirements.
Welding

Long side welding is carried out after the cut sheet is pre-bent and edging. The welding methods of rectangular pipe include straight seam welding and submerged arc welding.
Molding

The welded sheet is gradually formed through the action of the roller turbine to form a rectangular cross-section.
Straightening

The hydraulic straightening machine is used to straighten the formed pipe to ensure the accuracy of its shape and size.
Welding calibration

The welding strength of the straightened pipe is corrected to further improve the quality of the pipe.
Cutting

The pipe is cut according to the required length.
Inspection

Quality inspection of finished pipes to ensure that they comply with relevant standards and requirements.

In addition, there are some special processing technologies, such as rollforming (continuous rollforming) production, this method of high productivity, uninterrupted production in the welded pipe production line, and high yield, low head loss, is widely used in mass production. There are also processes including slitter unit, uncoiling levelling, cutting head butt welding, looping material storage, guide platform, rough forming, fine forming, extrusion welding, scratch welding, water cooling, positioning straightening, tracking fly cutting, finished product sorting and finished product packaging steps. Together, these steps ensure that the quality and performance of rectangular tubes meet the needs of industrial applications