China Rectangular Steel Pipe Manufacturers Suppliers Factory - Customized Service

High Quality Rectangular Steel Pipe for Construction, Solar and Industrial Applications

Rectangular Steel Pipe, also known as Rectangular Steel Tube or Rectangular Hollow Section (RHS), is a hollow structural steel product widely used in construction, solar structures, machinery, and industrial applications, with Wuxi Chengxingchuang providing customized solutions for global customers.

ERW Rectangular Steel Pipe
ERW Rectangular Steel Pipes are manufactured using high-quality carbon steel or alloy steel strips through a continuous forming process involving high-frequency resistance welding (ERW/HFW). They
Cold Formed Rectangular Steel Tube
Cold Formed Rectangular Steel Tubes are manufactured from high-quality carbon steel or alloy steel strips using precision cold bending and high-frequency resistance welding (ERW/HFW) processes. They
ZAM Rectangular Steel Pipe
ZAM Rectangular Steel Pipe is manufactured from zinc-aluminum-magnesium (Zn-Al-Mg) coated steel strip, using cold bending and high-frequency resistance welding (ERW) processes. It is widely used in
Bright Rectangular Steel Pipe
Bright Rectangular Steel Pipe is made of high-quality carbon steel or low-alloy steel, manufactured using cold-drawing or cold-rolling processes, and then subjected to bright annealing and precision

Types of Rectangular Steel Pipe

ERW Rectangular Steel Pipe

Manufactured through high-frequency Electric Resistance Welding technology, formed from steel strips into rectangular hollow sections, suitable for construction structures, solar mounting systems, machinery frames, and bulk industrial projects.

Cold Formed Rectangular Steel Tube:

Produced by cold-forming steel coils into rectangular profiles without heating, widely used for mechanical frameworks, equipment structures, industrial frames, and customized steel fabrication.

ZAM Rectangular Steel Pipe

Coated with Zinc-Aluminum-Magnesium alloy, designed for outdoor applications requiring enhanced corrosion protection, including solar mounting structures, agricultural facilities, and infrastructure projects.

Bright Rectangular Steel Pipe:

Manufactured for applications requiring a clean surface appearance and precision processing, commonly used in furniture, decorative structures, precision equipment, and architectural applications.

Specifications

Technical Parameter	Specification Details
Product Categories	ERW, Cold Formed, ZAM Coated, and Bright Rectangular Steel Pipes
Side Dimensions (Width × Height)	10 × 10 mm to 200 × 200 mm (Rectangular variations up to 150 × 200 mm)
Wall Thickness Range	0.75 mm to 12.0 mm
Standard Lengths	3 m, 6 m, 9 m, 12 m (Custom cut-to-length options available)
Material Grades	Q195, Q235, Q345, SPCC, S350GD, S450GD, S550GD
Surface Treatments	Black (Untreated), Hot-Dip Galvanized, ZAM Alloy Coated, Oiled/Bright Finish
Manufacturing Standards	ASTM A500, EN 10219, EN 10305, GB/T 6728

Manufacturing Process

01/

Raw Material Sourcing: Utilizing premium-grade steel coils from certified mills to ensure consistent chemical composition and tensile strength.

02/

Slitting and Uncoiling: Precision slitting of master coils into specific widths required for designated tube dimensions.

03/

Forming: Passing the steel strips through a series of roller dies to gradually transform the flat strip into a rectangular hollow profile.

04/

Welding (for ERW types): Applying high-frequency electrical resistance heating to fuse the edges seamlessly, followed by online weld bead trimming and non-destructive weld monitoring.

05/

Sizing and Straightening: Calibrating the tubes to exact outer dimensions and rectifying any residual camber through multi-roll straightening machines.

06/

Cutting and Finishing: Automatically cutting the continuous tube to standard or customized lengths, followed by deburring, surface treatment (oiling, painting, or coating), and bundling.

Applications

The versatility of rectangular steel pipes makes them indispensable across multiple global industries:

Construction and Infrastructure: Utilized extensively in structural steel building frames, high-bay warehouse columns, roof truss supports, industrial workshops, and load-bearing columns. Their closed geometry provides excellent resistance to multi-directional bending loads.

Solar Mounting Systems: Heavily deployed in utility-scale ground-mounted solar farms, rooftop photovoltaic support structures, and solar tracker torque tubes. ZAM and galvanized variants are heavily favored here due to their multi-decade outdoor lifespans.

Machinery Manufacturing: Applied in heavy-duty machine beds, industrial equipment chassis, automated conveyor support structures, and multi-tier maintenance platforms. Flat surfaces simplify joint welding, bracket mounting, and bolting.

Agricultural Frameworks: Integral to the construction of commercial greenhouses, livestock housing structures, pole barns, and robust agricultural implement frames.

Furniture and Interior Design: Bright rectangular steel pipes are widely chosen for modern metal office furniture, retail display shelving, architectural handrails, and decorative space-framing elements.

How to Choose the Right Rectangular Steel Pipe

Navigating global procurement requires evaluating several critical project parameters:

Determine the Application Environment

Use standard black or cold-formed tubes for indoor, controlled environments; select galvanized or ZAM tubes for outdoor or moisture-heavy zones; opt for bright tubes for visible architectural or furniture applications.

Define Geometrical Parameters

Clearly specify the outer dimensions (Width × Height) and wall thickness. For instance, a specification of 100 × 50 × 3 mm designates a 100 mm width, 50 mm height, and 3 mm uniform wall thickness.

Select the Appropriate Steel Grade

Choose Q195 for light non-structural tasks, Q235 for general engineering fabrication, and Q345 for high-stress industrial infrastructure demanding elevated yield strength.

Quality Control and Certifications

At Chengxingchuang, quality is monitored at every checkpoint of the manufacturing lifecycle. Our quality assurance system includes:

Incoming Material Verification

Chemical element analysis and tensile testing of raw steel coils.

Dimensional Monitoring

Continuous laser measurement of outer dimensions, squareness, and wall thickness during forming.

Weld Seam Integrity Testing

Rigorous online eddy current testing or ultrasonic testing to verify weld soundness.

Surface and Coating Evaluation

Regular checks on galvanizing or ZAM coating thickness (measured in grams per square meter) to ensure optimal corrosion defense.

Traceability

Complete batch tracking documentation provided upon request to satisfy global project auditing requirements.

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Packaging and Delivery

To protect products during long-distance ocean transit and inland logistics, we adhere to professional export packaging standards:

Bundling

Securely strapped into hexagonal or square bundles using heavy-duty steel strapping to prevent shifting during transit.

Surface Protection

Bundles can be wrapped in woven waterproof plastic bags or plastic film to protect against rain, moisture, and salt spray.

Marking

Clear steel tags detailing grade, dimensions, heat number, length, and net weight are attached to every bundle.

Logistics Support

Flexible shipping terms (FOB, CFR, CIF) via containerized shipping or bulk break-bulk vessels coordinated from major ports.

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Frequently Asked Questions

Q: What is the minimum order quantity (MOQ) for custom-sized rectangular steel pipes?

A: Our standard production MOQ is typically 5 metric tons per size, though trial orders for mixed containers can be negotiated based on current factory scheduling.

Q: Do you provide mill test certificates (MTC) with each shipment?

A: Yes, comprehensive EN 10204 3.1 Mill Test Certificates detailing chemical composition and mechanical test results are issued for every batch.

Q: How do you handle container loading to prevent transit damage for long steel tubes?

A: We utilize professional dunnage, protective plastic wrapping, and secure steel bracing inside 20ft or 40ft containers to eliminate shifting during ocean freight.

Q: Can third-party inspection agencies (like SGS or BV) be accommodated prior to dispatch?

A: Yes, we fully cooperate with designated third-party inspection companies for pre-shipment quality and quantity verification at our facility.

Q: What are your accepted payment terms for international transactions?

A: We commonly accept flexible payment structures including T/T (Telegraphic Transfer) and irrevocable Letter of Credit (L/C) at sight for qualified partners.

Q: Are your rectangular steel tubes compatible with standard automated laser cutting machinery?

A: Yes, our high dimensional consistency and uniform wall thickness make them completely optimized for automated laser cutting and CNC fabrication processes.

Q: What is the typical lead time for standard stock versus custom production runs?

A: Standard items ship within 7 to 15 days, whereas custom production runs generally require 20 to 30 days depending on order volume and processing complexity.

Q: Do you offer anti-rust oil application for black unpainted rectangular steel pipes?

A: Yes, light temporary anti-rust oil coating is applied by default to all black steel tubes to protect surfaces from moisture during maritime transit.

Q: Can you laser-print company logos or project identifiers directly onto the steel tubes?

A: Yes, we offer online inkjet and stenciling options to print custom text, specifications, or brand logos along the length of the pipe according to project requirements.

Q: What port of loading do you typically use for global export shipments?

A: We primarily ship through major eastern Chinese ports such as Shanghai and Ningbo, ensuring efficient access to global maritime routes.

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