Products Description
|
Parameter |
Specification |
|
Product Name |
Galvanized Square Steel Tube / Pipe |
|
Type |
Hot-Dip Galvanized (HDG) / Pre-Galvanized |
|
Material Grade |
Hot-Dip Galvanized: ASTM A500 Gr A/B/C, EN 10219 S235JRH/S355J2H, GB/T 6728 Q235B/Q355B, SS400, S275J0H |
|
Outer Dimension (Square) |
15×15mm – 600×600mm (Custom sizes available) |
|
Wall Thickness |
0.6mm – 30mm |
|
Standard Length |
5.8m, 6.0m, 11.8m, 12.0m, or Custom Cut-to-Length |
|
Zinc Coating (HDG) |
45-100 microns (Average 65-85μm), meetingISO 1461andASTM A123standards |
|
Zinc Coating (Pre-Galvanized) |
40-180 g/m² (Z40-Z180), equivalent to 6-25 microns |
|
Surface Finish |
Hot-Dip: Matte gray with spangle / Pre-Galvanized: Bright and smooth |
|
Section Shape |
Square / Rectangular (RHS) |
|
Production Process |
High-Frequency ERW Welded + Galvanizing |
|
End Finish |
Plain End / Grooved / Threaded (upon request) |
|
Tensile Strength |
315 – 550 MPa (Grade dependent) |
|
Yield Strength |
195 – 460 MPa (Grade dependent) |
|
Elongation |
≥20% – 30% |
|
Standard Compliance |
ASTM A500, EN 10219, JIS G3466, AS/NZS 1163, GB/T 6728, BS EN 10210 |
|
Hot Dip Galvanized vs. Pre-Galvanized Square Tube
|
||
|
Feature |
Hot-Dip Galvanized (HDG) Square Tube |
Pre-Galvanized Square Tube |
|
Process |
Tube is fully formed, then immersed in molten zinc bath |
Steel strip is galvanized before tube forming |
|
Zinc Coating Thickness |
45-100 microns (average 65-85μm), meeting ISO 1461 & ASTM A123 standards |
10-25 microns, providing economical corrosion protection |
|
Coating Bond |
Metallurgical bond between zinc and steel, extremely durable |
Zinc coating applied to flat strip, weld seam may require touch-up |
|
Corrosion Resistance |
Superior, suitable for harsh outdoor environments (25-75+ years service life) |
Good, suitable for indoor or mild environments |
|
Surface Appearance |
Matte gray with spangle pattern, slightly rough texture |
Bright, smooth, uniform appearance |
|
Cost |
Higher initial cost, lower long-term maintenance |
More economical upfront, ideal for budget-sensitive projects |
|
Best Applications |
Structural frames, outdoor fencing, marine environments, infrastructure projects |
Furniture, indoor racking, automotive components, general fabrication |
|
Common Square Tube Size Reference Chart |
||
|
Outer Dimension (mm) |
Common Wall Thickness Range (mm) |
Typical Applications |
|
20×20 – 50×50 |
1.0 – 3.0 |
Furniture frames, handrails, greenhouse structures, fencing |
|
60×60 – 120×120 |
2.0 – 6.0 |
Structural supports, machinery frames, solar mounting systems |
|
150×150 – 300×300 |
4.0 – 12.0 |
Heavy structural columns, bridge components, industrial frameworks |
|
350×350 – 600×600 |
8.0 – 30.0 |
Large-scale construction, infrastructure projects, high-rise buildings |
Key Features & Advantages
Premium Base Material: Manufactured from high-grade carbon steel strips (Q195, Q235, Q355, S235JR, S355J2H, ASTM A500 Gr B/C), ensuring excellent weldability, formability, and structural integrity.
Superior Corrosion Protection: Hot-dip galvanized tubes feature a thick, metallurgically bonded zinc coating (45-100μm) that provides exceptional resistance against rust and oxidation, significantly extending service life in outdoor and corrosive environments.
Precision Dimensional Tolerances: Outer dimension tolerance ±0.5%, wall thickness tolerance ±10%, meeting stringent international requirements for structural applications.
Clean & Smooth Interior/Exterior: Uniform square profile with smooth weld bead and consistent wall thickness, ensuring easy assembly and aesthetic appeal in exposed applications.
Wide Processing Capabilities: Available in standard mill lengths or custom cut-to-length sizes. We also offer drilling, punching, miter cutting, and welding services to meet specific fabrication requirements.
Quality Certifications: All products are manufactured under ISO 9001 certified quality management systems and are CE certified for European market compliance.
Quality Assurance & Mill Certificates
Comprehensive Testing: Each production batch undergoes rigorous inspection including chemical composition analysis, mechanical property testing (tensile, yield, elongation), dimensional accuracy verification, and zinc coating thickness measurement.
Zinc Coating Verification: Coating thickness is measured using magnetic induction gauges in compliance with ASTM E376 and ISO 2178 standards, ensuring full adherence to ISO 1461 and ASTM A123 requirements.
Documentation: All shipments include Mill Test Certificates (MTC) in compliance with EN 10204 3.1 or 3.2. We also provide Certificate of Origin (CO) , packing lists, and commercial invoices for seamless customs clearance.
Third-Party Inspection: We fully cooperate with pre-shipment inspections conducted by recognized agencies such as SGS, Bureau Veritas (BV), and Intertek to verify product quality and quantity before loading.
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