Product Overview
Black Square Steel Tube is manufactured from hot-rolled carbon steel using high-frequency electric resistance welding (ERW), providing consistent dimensions, reliable weld integrity, and stable mechanical performance for structural fabrication, machinery, construction, and industrial applications.
Specifications
|
Size range |
10mm×10mm to 200mm×200mm |
|
Wall Thickness |
0.75 mm to 6 mm |
|
Standard Length |
6 meters (Custom lengths available upon request) |
|
Executive Standards |
ASTM A500, EN 10219, JIS G3466, GB/T 6728 |
|
Available Steel Grades |
Q235B, Q355B, S235JR, S355JR, ASTM A500 Grade B |
Core Advantages
Maintained within strict industry-standard tolerances via advanced CNC sizing to minimize onsite fabrication adjustments and installation time.
Formed via HFW (High-Frequency Welding) and strictly verified through rigorous online Ultrasonic Testing to ensure maximum load-bearing reliability and safety.
Thoroughly treated with rust-inhibiting oil after acid pickling to completely remove mill scale and guarantee a clean, corrosion-free arrival at your port.
Value-Added Processing Options
Surface Finishes: Lightly oiled, dry, or treated with specific anti-rust varnishes based on your regional climate requirements.
End Finishes: Clean square cut with burrs completely removed. Custom beveling or precise length cutting can be arranged upon request.
Target Applications & Industries
Construction & Architecture: Building frameworks, scaffolding systems, and architectural columns.
Infrastructure & Green Energy: Solar panel mounting structures (PV brackets), highway guardrails, and municipal facilities.
Mechanical Engineering: Machine frames, automotive components, and agricultural equipment manufacturing.
Quality Control & Engineering Assurance
Raw Material Verification: Chemical composition and mechanical properties of hot-rolled coils are thoroughly tested before production.
Weld Seam Testing: 100% online ultrasonic non-destructive testing (NDT) is applied to monitor weld seam integrity continuously.
Traceability & Certification: Each bundle is labeled with heat numbers and production specifications. An EN 10204 3.1 Mill Test Certificate (MTC) is provided with every shipment, ensuring full traceability from factory floor to job site.
Packaging & Export Logistics
Secure Bundling: Securely strapped with heavy-duty steel bands and wrapped in waterproof woven plastic or plastic film to prevent transit damage and moisture accumulation during ocean freight.
Flexible Loading: Optimized for 20ft/40ft container loading or break-bulk shipping to accommodate project timelines and optimize freight costs.
How We Handle Your Custom Orders
Requirement Analysis: Share your detailed specs, drawings, or regional standard requirements.
Technical & Cost Evaluation: Our engineering team reviews feasibility and provides a competitive quotation within 24 hours.
Sample Confirmation: Pre-production samples or detailed Mill Test reports can be provided before mass production.
Production & Inspection: Strict monitoring with online NDT testing, followed by pre-shipment inspection (PSI) reports sent for your approval.
Logistics & After-Sales: Door-to-port or door-to-door tracking with dedicated customer support.
FAQ
Q: What is your Minimum Order Quantity (MOQ)?
A: Our standard MOQ is typically 5 metric tons per size for custom production runs. However, for trial orders or standard stock items, we are flexible and can accommodate smaller quantities or support mixed-size consolidations to help you test the market without heavy upfront inventory pressure.
Q: What is your typical production and delivery lead time?
A: Standard stock sizes can be shipped within 7 to 10 days. For custom production runs, the typical lead time ranges from 15 to 25 days depending on the total tonnage and specification complexity.
Q: Do you offer custom steel grades or specific mechanical property requirements?
A: Yes, aside from standard grades like Q235B and Q355B, we can adjust chemical compositions or mechanical property targets to meet specific regional standards or project drawings upon request.
Q: How do you calculate shipping weight-by actual weight or theoretical weight?
A: Quotations and billing are generally based on theoretical weight calculated using standard industry formulas, though actual weight billing can be arranged prior to contract signing if explicitly required.
Q: Can you mix different sizes of steel tubes in a single container?
A: Yes, we fully support mixed-size container loading (LCL/FCL consolidation) and fixed-length cutting (e.g., optimizing lengths for 20GP or 40HQ containers) to help you maximize container space and reduce shipping costs.
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