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Help CenterHot Selling Factory 6m 12m ERW Galvanized Square Pipe ASTM API
Product Spotlights
Uniform zinc coating, not easy to peel off
Accurate dimension & even wall thickness
Suitable for outdoor & coastal projects
Easy cutting, welding and fabrication
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Product Description
Galvanized Square Steel Tube / Pipe – Hot Dipped & Pre-Galvanized for Construction & Structural Applications
We are a premier manufacturer and exporter of Galvanized Square Steel Tubes (Hollow Structural Sections - HSS) in China. Our galvanized square pipes are produced using high-quality carbon steel strips or plates, formed into square hollow sections through high-frequency electric resistance welding (ERW), and subsequently treated with a protective zinc coating through either Hot-Dip Galvanizing (HDG) or Pre-Galvanizing processes.
Our products strictly comply with international standards including ASTM A500, EN 10219, JIS G3466, AS/NZS 1163, and GB/T 6728. With a comprehensive range of sizes, wall thicknesses, and zinc coating options, our galvanized square tubes are the preferred choice for construction frameworks, structural supports, fencing systems, agricultural greenhouses, solar mounting structures, and general fabrication.
Specification
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 |
Packaging and shipping
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