Product Overview
Bright Square Steel Tube is precision cold-drawn for high dimensional accuracy and a smooth surface, helping reduce machining, improve fabrication efficiency, and ensure reliable performance in industrial applications.
Specifications & Available Steel Grades
1. General Specifications
|
Project |
Range |
|
Side Length |
10×10 mm – 200×200 mm |
|
Wall Thickness |
0.75 mm – 6.0 mm |
|
Length |
Standard lengths 6 m, 9 m, 12 m; custom sizes available |
|
Surface |
Bright |
|
Delivery Condition |
Annealed or Tempered |
2. Common Steel Grades Supported
- European Standards (EN 10219 / EN 10305): E235 (+C/+N), E355 (+C/+N), S235JRH, S355J2H
- American Standards (ASTM A500 / AISI): AISI 1010, AISI 1020, AISI 1045, ASTM A500 Gr. A / Gr. B / Gr. C
- Chinese & ISO Standards (GB/T 6728 / ISO): Q195, Q235, Q355, 20#, 45#
Features
Surface roughness Ra of 0.2 to 1.6 μm with a scale-free metallic luster, suitable for direct plating, painting, or exposure.
Side length tolerance controlled within ±0.05 mm with uniform wall thickness and consistent corner formation for precise assembly.
Tensile strength of 400 to 700 MPa balancing strength and toughness, supporting further heat treatments like tempering and carburizing.
Supplied in carefully annealed or tempered conditions, ensuring balanced internal stress for easier bending, cutting, machining, and welding.
Customization & Value-Added Processing
Fixed-Length Cutting: Precision cutting with length tolerances down to ±0.5 mm, burr-free ends ready for immediate welding.
Special Surface Treatments: Pre-coating with specialized anti-rust oils, passivation, or customized oil-free dry packaging upon request.
Custom Profiles & Tolerances: Beyond standard square shapes, we support tailored inner-radius sizing (sharp corner or standard radius) to fit specific architectural and mechanical designs.
Typical Applications
Automotive Industry: Precision chassis components, seat structures, and internal automotive frames.
Fitness & Sports Equipment: High-end commercial gym equipment requiring high strength and clean aesthetics.
Modern Furniture & Architecture: Architectural displays, interior shelving units, and high-end aesthetic metal furniture.
Mechanical & Hydraulic Engineering: Structural machine parts, guide rails, and fluid-system support frames.
Standards & Global Compliance
EN 10219: Cold formed welded structural hollow sections of non-alloy and fine grain steels.
ASTM A500: Standard specification for cold-formed welded and seamless carbon steel structural tubing.
ISO 1461: Hot dip galvanized coatings on fabricated iron and steel articles.
Quality Management: Certified under ISO 9001, backed by CNAS and IAF dual-accredited testing laboratories, ensuring full material traceability and global regulatory compliance for engineering contractors.
Manufacturing & Quality Control Process
Raw Material Inspection: Strict chemical composition and microscopic structure analysis.
Precision Cold Drawing: Multi-pass cold drawing for precise outer dimensions and wall uniformity.
Bright Annealing: Controlled-atmosphere heat treatment to eliminate internal stress and achieve a bright surface finish.
Straightening & Non-Destructive Testing: Eddy current or ultrasonic testing combined with mechanical straightening.
Final Inspection & Certification: Dimensional checks, tensile testing, and issuance of 3.1 mill test certificates.
Export Packaging & Logistics
Surface Protection: Coated with anti-rust oil and wrapped securely in waterproof plastic film to prevent moisture and oxidation during ocean freight.
Secure Bundling: Bundled tightly with heavy-duty steel strips, reinforced with wooden blocks or woven bags to prevent transit deformation.
Global Logistics Support: Backed by established direct supply partnerships across Southeast Asia, Europe, and major global ports, ensuring secure export packaging, flexible shipping terms (FOB, CIF, DDP), and reliable local support.
Supply Chain & Fast Delivery
15-Day Fast Delivery: Supported by streamlined production scheduling, advanced manufacturing equipment, and optimized stock management for standard specifications.
Bulk Procurement Support: Dedicated account managers and flexible inventory solutions for large-scale engineering projects worldwide.
FAQ
Q: Can you provide free material samples for evaluation?
A: Yes, we offer free standard sample pieces for quality evaluation. Freight cost is typically borne by the buyer.
Q: What is your Minimum Order Quantity (MOQ)?
A: MOQ varies depending on the specification and production status, but we accept trial orders for new clients.
Q: What documentation is provided with the shipment?
A: Every order comes with a complete commercial invoice, packing list, bill of lading, and an EN 10204 3.1 Mill Test Certificate (MTC) with full traceability.
Q: Do you support customized dimensions or special heat treatments?
A: Yes, our engineering team works closely with clients on custom sizes, special wall thicknesses, and tailored mechanical properties.
Q: How do you control straightness and twisting in long square tubes?
A: We use advanced multi-roller mechanical straightening machines coupled with online laser straightness monitoring, ensuring straightness deviation of less than 1.5 mm per meter.
Q: Can these tubes undergo secondary laser cutting or bending?
A: Yes. Thanks to the uniform wall thickness, stable microstructures after bright annealing, and controlled low internal stress, our tubes perform exceptionally well in 3D laser cutting, CNC bending, and robotic welding.
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