Welded Square And Rectangular Tubes

Welded square and rectangular tubes are manufactured by bending and welding steel strip coils. Unlike seamless variants, these are produced using a welding process. They are primarily used for applications such as photovoltaic (PV) mounting bases, structural steel frameworks, equipment bases, vehicle chassis/frames, billboard supports, and safety fencing. Capable of withstanding external pressure and loads, they are suitable for diverse and demanding environments—including outdoor sites, farmlands, and areas near water bodies—offering both structural support and protective functions to meet the material requirements of various engineering projects.

Core Product Advantages:

1. Genuine Supply from Multiple Major Brands: 

We provide direct supplies of authentic welded square and rectangular tubes from leading steel mills such as Youfa, Juncheng, Lida, and Huaqi, alongside cost-effective, budget-friendly options. Our extensive product range caters to projects with varying budgets, from high-end engineering and standard infrastructure to temporary installations. All products come directly from the mills, eliminating intermediary markups; buyers can select brands and quality grades based on their specific needs rather than being forced to accept a single product type.

2. Proven and Reliable Welding Technology: 

These welded square and rectangular tubes are manufactured using mature welding and forming processes. The weld seams are ground smooth and uniform, ensuring strong, stable joints that resist cracking, weld failure, and deformation under normal operating conditions. The tubes offer excellent overall load-bearing capacity and a stable metallurgical structure. They exhibit strong corrosion resistance against sun and rain, meeting the long-term service requirements for outdoor PV installations and steel structures, thereby reducing future maintenance and repair costs.

3. Flexible Procurement Options: 

With low entry barriers, we accommodate everything from large-scale bulk orders for major projects to small-batch restocking and individual spare part purchases. Whether serving large general contractors or small construction firms, we allow orders tailored to specific needs—free from the constraints of high minimum order quantities—and flexibly align with the customer's phased procurement requirements.

4. High Adaptability Across Scenarios: 

These tubes are suitable for a wide range of PV projects, including centralized power plants, distributed rooftop solar, and agrivoltaic or fishery-solar hybrid systems. They are also widely used in construction, machinery manufacturing, vehicle body fabrication, billboard frameworks, glass curtain walls, and safety fencing. Suitable for diverse and challenging outdoor environments—such as damp ponds, saline-alkali farmland, and open fields—while also accommodating various indoor and outdoor installation scenarios.

Product Technical Specifications:

Project	Specification Details
Section Size	Square tube: 1010-500500mm; Rectangular tube: 2010-400600mm
Wall Thickness Range	1.2-16mm
Common Material Grade	Q235B; Q355B available upon request
Standard Length	6 meters, custom cut lengths supported
Surface Finish	Black tube; hot-dip galvanizing available
Implementation Standard	GB/T 6728-2025
Main Application Scenarios	Glass curtain wall, steel structure frame, equipment rack, guardrail & enclosure, carriage, advertising frame

After-Sales and Service：

Pre-sales Service: 

During the initial consultation, our sales team thoroughly assesses the client's project conditions, installation environment, and load requirements. By analyzing actual site conditions, we meticulously verify details such as pipe dimensions, wall thickness, surface treatment, and material composition to provide selection recommendations tailored to the specific project. We typically provide a comprehensive selection proposal within two days. Through multiple rounds of communication to confirm requirements, we proactively prevent losses caused by incorrect selection or specification mismatches, thereby minimizing procurement risks at the source.

In-sales Service: 

Following contract signing, we arrange supplies strictly according to agreed specifications, maintain welded square and rectangular tubes quality control, and ensure timely shipment. We proactively communicate and resolve any issues arising during production or stock preparation to ensure delivery schedules are met. We accept shipments from other suppliers to our warehouse for consolidated loading (note: storage fees apply for large-volume shipments).

After-sales Service: 

Upon the goods' arrival at the site, we provide professional technical guidance on product usage, stacking, and processing. We answer practical questions regarding rust prevention during storage and on-site cutting or welding, actively cooperating with the client to ensure smooth project integration. Should any product-related issues arise, we provide rapid follow-up and resolution; we can assist in connecting clients with local installation teams, though we do not directly dispatch installation personnel ourselves.

Why Choose Shixinda?

We specialize in genuine welded square and rectangular tubes from major, well-known brands. All supplied pipes are sourced from reputable large-scale manufacturers; we enforce strict inbound inspection protocols to prevent substandard materials from entering the supply chain and verify the original manufacturer's quality for every batch, ensuring all delivered pipes meet national engineering standards. Committed to integrity, we never substitute inferior products for quality ones. We serve numerous photovoltaic power plants and infrastructure projects, with a track record of successful centralized, distributed, and integrated (agrivoltaic/aquavoltaic) projects. We impose no mandatory minimum purchase thresholds; whether for large-scale bulk orders or small-batch spare part procurement, we treat all clients equally. We offer one-stop procurement support, giving buyers peace of mind and reducing the risks associated with material selection. FAQs:

Q1: Can welded rectangular tubes undergo hot-dip galvanizing?

Yes, black square/rectangular tubes can be hot-dip galvanized to significantly enhance outdoor corrosion resistance; please note that this requires additional processing time.

Q2: What is the minimum purchase quantity? Are there any order minimums?

There is no strict minimum order quantity; we accept orders ranging from large-scale project batches to small-quantity purchases for spare parts.

Q3: How should I choose between welded and seamless rectangular tubes?

Welded tubes are the preferred choice for general supports and frameworks due to their superior cost-effectiveness, whereas seamless tubes are recommended for high-pressure and high-load applications.

Q4: Can you cut the tubes to specific lengths?

Yes, we offer custom-length cutting services; applicable processing fees apply based on the specifications.

Q5: Can the goods be delivered to the customer's own warehouse in Guangzhou?

Yes, we can arrange delivery to designated warehouse locations within the country as requested.

Q6: How can I obtain samples, and who covers the shipping costs?

We can provide samples; while the samples themselves are free of charge, the buyer is responsible for shipping costs.