Our wholesale galvanized welded steel tubes are ERW electric resistance welded carbon steel pipes treated with hot-dip galvanization. Made of Q195/Q235/Q355 mild steel, uniform zinc coating provides long-term corrosion resistance. Available in round, square, rectangular hollow profiles, widely sold wholesale to global distributors, contractors and industrial project owners. Flexible specifications, large stock, support OEM & bulk wholesale orders.
Classification Dimension
| Classification Dimension | Detailed English Explanation |
| Main Product Name | Wholesale Galvanized Welded Steel Tubes (Alias: GI Welded Pipe, HDG Welded Steel Tube, Pre-galvanized ERW Tube) |
| Welding Technology | ERW Electric Resistance Welded, high welding seam tightness, low deformation |
| Galvanizing Type | 1. Hot Dip Galvanized (HDG): Zinc coating Z180-Z600, best anti-corrosion for outdoor |
| 2. Pre-Galvanized (Electro Galvanized): Thin zinc layer for indoor light structure | |
| Cross Section Types | Round Galvanized Welded Tube / Square Galvanized Welded Tube / Rectangular Galvanized Welded Tube |
| Raw Material Grade | Q195, Q235B, Q345B carbon steel strip |
| Standard Length | 6m / 9m / 12m fixed length, custom cutting acceptable for wholesale orders |
Technical Item
| Technical Item | Standard Parameters of Wholesale Galvanized Welded Steel Tubes |
| Executive Standards | ASTM A53, BS1387, GB/T3091, EN10219 |
| Wall Thickness Range | 1.2mm – 12mm |
| Outer Diameter (Round Tube) | DN15 – DN300 (1/2 inch – 12 inch) |
| Square Tube Size | 10×10mm – 300×300mm |
| Rectangular Tube Size | 20×10mm – 400×200mm |
| Zinc Coating Weight | Z180 (180g/㎡), Z275, Z350, Z450, Z600 optional |
| Yield Strength | Q195 ≥195MPa; Q235 ≥235MPa; Q355 ≥355MPa |
| Tolerance | Outer diameter ±0.5%, wall thickness ±0.3mm |
| Surface Finish | Smooth uniform zinc layer, no peeling, no black spots |
| Processing Support | Cutting, punching, bending, threading, flanging for wholesale projects |
Advantage
| Anti-Rust Durability | Hot-dip zinc coating forms sacrificial protection, service life over 30 years outdoors, low maintenance cost |
| Stable Weld Quality | Advanced ERW welding process, seamless weld line, resistant to low-medium pressure fluid transportation |
| Cost-Effective Wholesale Price | Direct factory supply without middlemen, bigger bulk order gets better discount for global wholesalers |
| Wide Size Coverage | Full range of round/square/rectangular tubes, one-stop purchase for construction & industrial projects |
| Strong Compatibility | Easy to weld, cut, bend and thread; fits scaffolding, pipeline, frame, irrigation systems perfectly |
| Custom Service Support | Custom length, zinc thickness, logo printing, special packaging for distributor wholesale brands |
| Stable Supply Capacity | Large daily production stock, fast loading & short lead time for large wholesale orders |
Application Industry
| Application Industry | Specific Usage of Galvanized Welded Steel Tubes |
| Building Construction | Scaffolding tubes, building steel frames, guardrail, fence, curtain wall support |
| Municipal Water Supply | Low-pressure water delivery pipes, sewage pipelines, fire sprinkler pipes |
| Agricultural Irrigation | Farm irrigation pipelines, greenhouse steel support frames |
| Industrial Equipment | Machine stand frames, conveyor brackets, workshop metal structures |
| Oil & Gas Low Pressure | Indoor gas transmission pipes, small fluid conveying pipelines |
| Solar & New Energy | Solar panel mounting brackets, photovoltaic support tubes |
| Infrastructure Project | Bridge auxiliary support, road safety barrier, municipal engineering structures |
| Wholesale Distribution | Stocked GI tubes for local hardware distributors, building material wholesalers |
Production Step
| Production Step | Process Description for Galvanized Welded Steel Tubes |
| 1. Raw Material Inspection | Check Q195/Q235/Q355 steel strip thickness & surface quality |
| 2. ERW Welding Molding | Roll steel strip into tubular shape, electric resistance seamless welding |
| 3. Deburring & Calibration | Remove welding burrs, calibrate tube size to standard tolerance |
| 4. Surface Cleaning | Pickling & flux treatment to remove rust for better zinc adhesion |
| 5. Hot Dip Galvanizing | Immerse tubes into 450℃ molten zinc to form alloy anti-rust coating |
| 6. Cooling & Surface Finishing | Air cooling, polish zinc surface, inspect coating uniformity |
| 7. Length Cutting & Testing | Cut to fixed length, do hydraulic pressure & bending test |
| 8. Packaging & Warehouse | Bundle with steel strips, label specification, stock for wholesale delivery |
Product Show
FAQ
Q: 1.What is wholesale galvanized welded steel tube used for?
A: It is widely used in construction scaffolding, municipal water pipelines, agricultural irrigation, solar brackets, industrial frames and fence structures, suitable for indoor and outdoor anti-rust projects.
Q: 2.What's the difference between hot dip and pre-galvanized welded tubes?
A: Hot dip galvanized has thick zinc layer (Z275-Z600) with superior outdoor anti-corrosion performance; pre-galvanized has thin zinc coating, only for indoor light structural use with lower
3.Can I get custom size galvanized welded steel tubes for wholesale?
Yes, we support custom outer diameter, wall thickness, length, zinc coating weight and threading processing for bulk wholesale orders.
Q: 4.What wholesale price discount can I get for large orders?
A: We offer tiered volume discount: 5-20 tons standard price; 20-50 tons 3% off; above 50 tons 5%-8% factory wholesale discount.
Q: 5.Do you provide free samples of galvanized welded steel tubes?
A: Small cutting samples are free, buyers only need to bear the international courier freight cost.
Q: 6.What quality test reports can you provide?
A: We supply mill test certificate (MTC), SGS coating thickness test report, hydraulic pressure test report for every wholesale shipment.
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