This Pre galvanized Square and Rectangular Steel Tube is divided into two categories: square cross-section tubes and rectangular cross-section tubes. The entire production process uses CNC fixed-length cutting, automatic pipe mouth deburring and grinding, and strict compliance with national standards for the verticality of the four sides and the thickness error of the pipe wall. It can be adapted to various mainstream steel substrate materials, including common low-carbon structural steel and low-alloy high-strength steel. Full-size specifications support on-demand cutting, punching, bending, and pre-processing such as beveling and pre-treatment.
There is no need for secondary grinding by the buyer, and it can be directly welded and assembled upon entry. The entire production process follows national steel pipe manufacturing and metal coating inspection standards. Each batch of products comes with the original factory material certificate and zinc coating thickness test report. It supports on-site sampling inspection and verification by third-party institutions.
1. Online steel strip pre-galvanizing process, with high integration of coating and steel strip substrate. The surface of the tube after bending and cutting is less likely to have large-scale rusting, avoiding defects of incomplete hot-dip coating at the welds of the laterally galvanized pipes.
2. Closed hollow structure of the cross-section, balanced mechanical stress. Under the same load-bearing conditions, the self-weight of this type of pipe is much lower than that of solid steel, effectively reducing the overall engineering structure load and compressing the total material procurement volume.
3. The surface silver-gray zinc layer has a self-protective effect. In indoor normal conditions, the base paint and top paint coating process can be omitted, shortening the project construction period and reducing coating procurement and labor costs.
4. Specifications cover thin-walled decorative models to heavy-load models. Small-sized tubes are suitable for indoor partitions and equipment shells, while thick-walled tubes can be used to build outdoor load-bearing supports and lightweight steel structure main bodies.
5. The processing is highly adaptable. Laser cutting, arc welding, mechanical drilling, and cold bending molding will not cause the entire surface coating to fall off. It is suitable for the production of various non-standard equipment and custom components.
6. The inventory categories are rich. There is an adequate stock of standard lengths of 6 meters and 12 meters. Special lengths can be cut to the required fixed length on the same day. It is suitable for short-term rush orders, long-term supply of batch projects.
7. The raw materials for Pre galvanized Square and Rectangular Steel Tube are directly purchased from major factories. The steel strip has low impurity content, and the pipe welding has no air holes or cracking problems. The finished product has straightness compliance, and it is not prone to bending and deformation during storage and transportation.
Take a pipe sample and cold bend it at 90 degrees. The surface zinc layer shows no peeling or large-scale detachment. Only a slight metal exposure at the bending section occurs. After being exposed to the outdoor environment for 30 days, there is no rust spread.
In a neutral salt spray environment for 480 hours, only the edge of the pipe outer wall produces a small amount of white rust, without penetrating red rust, meeting the standards for indoor and semi-open environment use.
Compared with equal-weight angle steel of the same specification, the lateral compressive bearing capacity of this pre-galvanized rectangular tube is 22% higher, and the vertical torsional deformation performance is improved by 30%. The stability of the support structure is stronger. 4. Dimension tolerance sampling inspection: Randomly select 100 pieces of pipe materials from the inventory. The errors in length, width, and thickness all fall within the allowable range specified by the national standard. The deviation of the right-angle perpendicularity is less than 0.5°, meeting the requirements for precise assembly of the curtain wall.
Fully weld and assemble the pipe material frame. The weld seam position is not interfered by coating impurities. The welding is formed smoothly. The overall frame withstands the impact test under high and low temperatures without any fracture or deformation.
Place the pipe materials in a cycle environment ranging from -20°C to 60°C for 90 days. The zinc layer shows no cracking or powdering. The pipe material itself does not deform. It is suitable for outdoor projects in regions with large temperature differences between the north and south.
Bundle the pipe materials in multiple layers for long-distance transportation by vehicle. The surface layer of the pipe material only has slight scratches, and there is no large area of coating wear. After unloading, no secondary anti-corrosion repair is required. Application scenario
Photovoltaic support structure complete system, indoor commercial partition, factory building lightweight steel structure, greenhouse frame, urban small-scale landscape guardrail, mechanical equipment base frame, curtain wall inner lining support framework, storage shelf load-bearing column, vehicle lightweight modification frame, indoor decoration metal shaping framework
It is suitable for indoor and semi-outdoor scenarios. For environments with constant exposure to rain and sun, hot-dip galvanized pipe materials are recommended.
Yes, we offer CNC fixed-length cutting service, with no additional high processing fees.
Each batch of goods comes with a material sheet and coating inspection report, and third-party re-inspection is supported.
The minimum size for square tubes is 20×20mm, and the maximum is 500×500mm. The specifications for rectangular tubes can be customized as needed.
The cutting surface can be matched with galvanized repair paint, and after construction, water vapor can be isolated to avoid rusting.
For indoor decoration， Q195 is recommended. For outdoor load-bearing and large-scale projects， Q235B/Q355B is preferred.
Address
S213 Jinghai District, Tianjin City, China
Tel
