Product Overview
ERW Square Steel Pipe is produced by high-frequency welding with accurate dimensions and stable quality, suitable for structural frames, machinery, and fabrication projects.
Specifications
|
Product Name |
ERW Square Steel Pipe |
|
Cross-Section Shape |
Square |
|
Outer Diameter Range |
10×10 mm – 200×200 mm |
|
Wall Thickness |
0.75 mm – 6.0 mm |
|
Length |
3 m / 6 m / 9 m / 12 m or customized |
|
Material Grades |
Q195 / Q215 / Q235 / Q345, SS400, Gr.B, etc. |
|
Manufacturing Process |
ERW |
|
Surface Finish |
Black annealed / Unpainted / Hot-Dip Galvanized / Pre-Galvanized (Customized surface treatments available) |
|
Standards |
ASTM / EN / GB |
|
Processing Services |
Precision cutting, laser cutting, punching, chamfering, end-sealing, and custom welding fabrication. |
Key Features
Outer dimensions are tightly controlled within a tolerance of ±0.15 mm, ensuring seamless fit-up and precise alignment during structural assembly.
The thickness is evenly distributed across all four sides, guaranteeing consistent load-bearing capacity and structural stability under demanding engineering loads.
Produced using high-frequency induction welding paired with 100% online eddy current testing, ensuring zero-defect longitudinal seams.
Hot-dip galvanized tubes featuring a robust zinc coating (200–275 g/m²) for long-lasting atmospheric protection.
Target Applications & Industries
Construction & Infrastructure: Structural framing, scaffolding systems, architectural support columns, and civil engineering frameworks.
Mechanical & Industrial Engineering: Equipment chassis, heavy-duty machinery frames, material handling conveyor systems, and agricultural implements.
Commercial & Residential: Automotive components, trailer manufacturing, security fencing, access gates, solar panel mounting structures, and interior display shelving.
Manufacturing & Quality Control Process
Raw Material Inspection: Only premium hot-rolled and cold-rolled steel coils sourced from certified top-tier mills are accepted.
Forming & High-Frequency Welding: Precision roll-forming combined with high-frequency induction heating to fuse longitudinal seams.
Online Non-Destructive Testing: 100% online eddy current testing detects and eliminates any potential weld defects instantly.
Mechanical & Metallurgical Testing: Every production batch undergoes comprehensive evaluation, including tensile strength, yield strength, elongation, flattening, and bending tests.
Certification & Traceability: A full EN 10204 3.1 Mill Test Certificate (MTC) is issued with every shipment, ensuring complete material traceability and compliance. Third-party inspections (SGS, BV, TUV) are fully supported.
Standard Export Packaging & Logistics
Secure Bundling: Tightly secured with high-strength steel strapping in hexagonal or square bundles to prevent shifting.
Surface Protection: Wrapped in waterproof plastic film or woven bags to protect against moisture and sea salt corrosion during ocean transit.
End Protection: Plastic caps can be applied to both ends upon request.
Container Optimization: Expert loading techniques by experienced logistics teams ensure safe placement inside 20GP/40GP containers or bulk carriers, avoiding transit bending or deformation.
FAQ
Q: What is your Minimum Order Quantity (MOQ)?
A: Generally, our MOQ is 3 metric tons per size. However, we support trial orders and mixed containers for new clients. Please contact our sales team to discuss your specific requirements.
Q: Can you provide free product samples before placing a bulk order?
A: Yes, we are pleased to offer free small-sized samples for quality evaluation, while freight costs are typically borne by the buyer.
Q: What is the standard lead time for production?
A: Standard production takes approximately 15 to 25 days after receiving the deposit, depending on the order quantity, current mill schedule, and customization requirements.
Q: How do you guarantee the safety of long-distance ocean transport?
A: Our pipes undergo strict export-grade bundling and wrapping. Furthermore, our logistics team utilizes professional loading techniques to prevent shifting or bending inside the container during transit.
Q: What payment terms do you accept?
A: We typically accept T/T (Telegraphic Transfer) with a 30% deposit and the remaining 70% balance against the copy of the Bill of Lading. Irrevocable L/C at sight is also negotiable for long-term partners.
Q: What certifications do your manufacturing facilities hold?
A: Our production facilities are fully certified under ISO 9001 Quality Management Systems, ensuring that all manufacturing processes comply with strict international industrial standards.
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