Heavy-duty Thick-wall Welded Square Steel Tube

Heavy-duty thick-wall welded square steel tube is a large-bore high-strength welded hollow structural section. It is cold formed from premium steel plates and welded by full penetration submerged arc welding. As a key structural profile for heavy-load mechanical engineering, it combines large cross-section and heavy wall thickness. It optimizes dead weight while maintaining structural strength and rigidity, suitable for working conditions under static load, impact load and cyclic stress, widely used for main structures of various heavy machinery and equipment.

◎ Production Process: Steel plates cold forming, full penetration submerged arc welding. Welds are inspected by non-destructive testing to eliminate welding defects. Tubes are straightened and end-faced with tight dimensional tolerance control.

◎ Available Steel Grades: Q355B, S355JR, ASTM A500 Gr.B and other high-strength structural steel. Suitable steel grade can be selected according to mechanical requirements of your project.

◎ Surface Treatment: Custom options including sandblasting, anti-rust primer, hot-dip galvanizing and anti-corrosion coating, to improve corrosion resistance for indoor and harsh outdoor environments.

Superior Load Capacity The thick wall and large cross-section design delivers excellent bending, torsional and compression resistance. It can sustain heavy loads continuously and resist impact and vibration with low deformation risk, ensuring long-term stable operation of complete equipment.

Excellent Structural Performance Hollow section design brings lighter self-weight compared with solid steel profiles. It reduces equipment weight and energy consumption while maintaining high overall rigidity, simplifying mechanical structural design.

High Machinability Strict control on straightness, section dimension and end flatness. The tubes are easy for cutting, drilling, machining, secondary welding and assembly, saving fabrication time on site.

Flexible Customization Custom large bore and extra heavy wall sizes are available. Cross-section dimension and tube length can be tailored. Both trial small orders and mass bulk orders are acceptable.

Strict Quality Control Each batch undergoes mechanical property tests, weld NDT and dimensional inspection. Complete test documents are provided with full quality traceability.

★  Developed for heavy-duty mechanical engineering applications:

★  Heavy machinery frames, large equipment bases and foundations

★  Construction machinery outriggers and chassis supporting structures

★  Crane frames, gantries and load-bearing main beams

★  Load-bearing structural parts for mining machinery and engineering equipment

★  Main frames of large automatic equipment and production lines

★  Load-bearing frames for large jigs and test platforms

Pre-processing services such as cut-to-length and beveling are available. Mill test certificates and NDT reports can be supplied together with goods. Stable bulk delivery and export packaging solutions are supported.

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