Mild Steel Rectangular Hollow Section

Mild steel rectangular hollow section is a rectangular cross-section structural pipe made of low carbon steel (such as Q235B, Q355B) by cold bending or high-frequency welding. The cross-section is rectangular, so it is named "rectangular pipe". Mainly used for load-bearing, support and connection, it can obtain higher cross-sectional moment of inertia and bending capacity than angle steel and round tubes without increasing the cross-sectional area. It is the main component of "vertical support and diagonal support" in various types of steel structures. The rectangular tube has uniform wall thickness and stable molding dimensions. With surface treatments such as hot-dip galvanizing and plastic spraying, it can serve for a long time in harsh outdoor environments.

Product core advantages

①Excellent cross-section mechanical properties and less material usage

The bending and torsion resistance of the rectangular section is significantly better than that of angle steel and round tubes of the same weight. It uses less material and has a lighter structure under the same bearing capacity, reducing the overall cost and foundation load.

②Full specification coverage, non-standard can be customized

Mild steel rectangular hollow sections cover C/U/J/H/Z/I section steels, square pipes, round pipes, angle steels, channel steels and other all-type material systems. Rectangular pipes can be customized with side length, wall thickness, and fixed length according to customer drawings. All structural parts of the bracket are provided in one stop, reducing the cost of multi-supplier coordination.

③Mature technology and stable precision

The high-frequency welded pipe unit ensures uniform welds and straight pipe bodies. The cold bending equipment ensures that the side length tolerance is consistent with the wall thickness, and the dimensional accuracy is stable. The docking is smooth during installation and reduces on-site rework.

④The anti-corrosion treatment is in place and the service life is guaranteed.

It supports various surface treatments such as hot-dip galvanizing, zinc-aluminum-magnesium, and plastic spraying, and can adapt to harsh environments such as high salt spray and strong ultraviolet rays. Together with the overall design of the bracket system, it can meet the use requirements of the power station for more than 25 years.

After-sale guarantee

①Pre-sales technical support, choose the right specifications without rework

Before you place an order, you will be provided with project drawings, usage scenarios, and local climate conditions. Our technical team will provide free selection suggestions and cross-section stress review to help determine whether the wall thickness, side length, and surface treatment match the wind load, snow load, and corrosion level. Avoid material waste and installation rework caused by wrong specification selection at the source.

② Quality control during sale, full traceability

The production process of mild steel rectangular hollow sections strictly implements 4 major inspections and 16 standards: raw material incoming inspection, forming process sampling inspection, finished product full-size inspection, and final inspection before shipment. The key dimensions of each batch (side length, wall thickness, straightness, weld appearance, coating thickness) are randomly inspected batch by batch. Raw material testing reports, production quality inspection reports and third-party testing reports are attached with the goods. The entire quality process is traceable.

③ Timely delivery, urgent orders can be coordinated

Relying on 50,000 tons of raw material reserves and 500,000 tons of annual production capacity, regular batch orders are stably scheduled according to the contract cycle. The factory is close to the Tianjin Port. After production is completed, customs declaration and packing are done nearby, which shortens the waiting time for shipping. If the customer's project node is advanced or the order is urgently filled, the order can be coordinated and prioritized to ensure the progress of the on-site construction.

④ Quick after-sales response, no problem solved overnight

The professional after-sales team will handle the entire process of delivery and installation: deformations during transportation, objections to the size of the arrival, technical questions on on-site installation, etc., and will provide a solution within 24 hours. Replacement parts will be replaced, and the technology will be matched with the other party's technology to prevent problems from blocking the progress of the project.

⑤Long-term cooperation policy, stable price and supply

Provide price protection and priority rights to repurchase customers, and support the signing of long-term framework agreements to lock in supply and unit prices. Complete project files (drawings, batches, test reports) are provided to facilitate quick docking during subsequent repurchases. Long-term cooperative customers can also enjoy exclusive docking windows and technology upgrade services.

Application areas

Mild steel rectangular hollow sections are widely used in photovoltaic and general steel structure scenarios due to their high load-bearing capacity, easy welding, and various surface treatments:

①Photovoltaic bracket structural parts

It is used as the columns, diagonal braces, main beams, and secondary beams of the photovoltaic support system. It is matched with purlins, hoops, and triangular connectors to support fixed and tracking supports. It is the core load-bearing component of ground power stations and distributed rooftop power stations.

②Ground centralized power station

In large-scale ground power stations with harsh environments, rectangular low-carbon steel pipes bear component support and foundation connections. Together with hot-dip galvanizing for anti-corrosion, they can withstand wind load, snow load and outdoor corrosion for a long time.

③Agricultural and photovoltaic complementation/fishing and photovoltaic complementation

The high-level bracket structure used in agricultural greenhouses and fishing light projects ensures the height and span of component erection while taking into account the agricultural and fishery operating space, achieving the dual purpose of "power generation + production".

④Industrial and commercial roof distribution

As the purlins and columns of the roof support, they are lightweight and easy to install, and are suitable for different roofs such as colored steel tiles and concrete.

⑤Photovoltaic carport and building skeleton

Mild steel rectangular hollow section is used for photovoltaic carport columns, ceiling frames, and skeleton construction of industrial plants, agricultural greenhouses, and simple sheds.

⑥Municipal and engineering enclosure

Mild steel rectangular hollow sections can be used for general steel structures such as fences, guardrails, shelves, frames, etc. One material can be used for multiple purposes, reducing the number of materials to prepare.

FAQ

Q1: Compared with rectangular steel pipes and round pipes, which one should I choose? 

Look at the direction of force. Mild steel rectangular hollow sections are more resistant to bending and torsion, and save more material when used as columns and beams; round tubes are evenly stressed in all directions and are suitable for pure compression. The load-bearing structure of the bracket generally gives priority to rectangular tubes, taking into account both strength and ease of installation.

Q2: What is the minimum order quantity? Can non-standard sizes be made? 

Regular specifications require a minimum order of 1 cabinet, and non-standard side lengths, wall thicknesses, and fixed lengths can be customized. The annual production capacity is 500,000 tons, and we can accept batch orders and large orders. The specific calculation is based on the drawings and usage.

Q3: How long does it take for the pipes to be delivered to the port? 

The factory is in Tianjin, which is close to Tianjin Port. After production, the products are packed and shipped nearby. Regular batch orders are scheduled according to the contract cycle, urgent orders can be coordinated and inserted, and the delivery date is clear before placing the order.

Q4: Should I choose hot-dip galvanizing or zinc-aluminum-magnesium for surface treatment? 

In coastal and high-salt-spray areas, zinc-aluminum-magnesium or thick galvanizing is preferred; generally, hot-dip galvanizing for outdoor use is more cost-effective. We will give you suggestions based on the climate of the area where your project is located, and attach a test report.

Q5: Can you provide drawings or samples for confirmation first? 

Can. We will send you the cross-section size and purpose first. We will calculate the stress and review the drawings for free. If you are satisfied, we will place an order. For non-standard specifications, it is recommended to make a sample to confirm the size before mass production.