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Galvanized Steel Pipe
Product Overview
Our Galvanized Round Steel Tubes (also referred to as galvanized pipes) are high-quality carbon steel tubes protected by a metallurgically bonded zinc coating. Produced through either hot-dip galvanizing (post-fabrication) or pre-galvanizing (from galvanized coil), these tubes combine the strength and formability of steel with exceptional long-term corrosion resistance.
The zinc coating provides dual protection: it acts as a physical barrier against moisture and oxygen, while also offering sacrificial cathodic protection. This means that even if the surface is scratched, cut, or threaded during installation, the surrounding zinc will corrode preferentially, preventing red rust from forming on the exposed steel. Available in a wide range of outer diameters, wall thicknesses, and galvanizing methods, our round tubes are the ideal choice for structural, mechanical, fluid conveyance, and architectural applications.
Quick Specification Table (Typical Options)
| Item | Typical Range / Options |
| Base steel grades | DX51D, SGCC, SPCC, DC01, S220–S450 |
| Base thickness | 0.12 mm – 3.0 mm (common: 0.25–1.5 mm) |
| Strip/coil width | 600 mm – 2000 mm (common: 914, 1000, 1250 mm) |
| Coil ID | 508 mm, 610 mm (others on request) |
| Coil weight | 0.5 MT – 10 MT per coil |
| Coating type | Al‑Zn alloy (typically 55% Al / 43.4% Zn / 1.6% Si) |
| Coating mass / thickness | AZ30 – AZ180 g/m² (expressed as g/m² total or g/m² per side) |
| Surface finish | Smooth, Embossed (rare), Silicon residue/Matte |
| Surface treatment | Passivation, chromate-free passivation, oiling |
| Coating appearance | Bright/metallic with thin Al oxide layer |
| Tolerances & standards | Per ASTM A792 / EN 10346 / JIS G3321 / GB/T 2518 |
| Packing | Inner VCI/kraft wrap, steel straps, wooden crate/pallet, shrink film |
| Certificates & tests | MTR, coating mass report, third-party inspection (SGS/BV) |
| Lead time | 10–30 days depending on stock and customization |
| MOQ | Typically 1–5 MT per spec; depends on mill |
Buyer Priorities Covered
Performance & durability: corrosion protection, coating adhesion, long-term life in intended environment.
Dimensional compatibility: outer diameter (OD), wall thickness (SCH/WT), length, end finish and tolerances to fit with fittings and assembly lines.
Traceability & compliance: material certificates (MTR), standards (ASTM, EN, JIS, GB), and third-party inspection.
Logistics & packaging: export packing, MOQ, lead time, and Incoterms.
Cost & lifecycle value: comparing galvanized pipe to alternatives (painted, stainless, PVC) for total cost of ownership.
End Finishes Available
| End Finish | Description | Application |
| Plain End (PE) | Square-cut ends, may be deburred. | General fabrication, welding, structural use. |
| Beveled End (BE) | 30–37.5° bevel for welding preparation. | Butt-welded pipelines, high-pressure applications. |
| Threaded End (TE) | Threaded according to NPT, BSP, or ISO standards. | Plumbing, fire protection, mechanical joining. |
| Threaded with Coupling | One end threaded, one coupling attached. | Ready for immediate field connection. |
| Grooved End | Roll-grooved or cut-grooved for mechanical couplings. | Quick-connect piping systems (e.g., fire protection). |
Common Applications (buyer-centered)
Fencing & handrails: economical, corrosion-protected structural tubing for residential and commercial fencing, handrails and balustrades.
Structural and architectural: lightweight framing, supports, scaffolding (with specified load and coating requirements).
Piping for water and gas (where standards permit): galvanized pipe historically used for potable water and gas; check local codes and standards—some markets prefer black steel or coated alternatives.
Outdoor furniture & playground equipment: durability and safety combined with good finish for painting.
Agricultural & irrigation structures: greenhouse frames, posts and supports requiring corrosion resistance.
Mechanical & industrial uses: conveyor rollers (as mandrels), machine frames and protective guards.
Sign posts, poles & lighting columns (depending on structural specs).
FAQ — Frequently Asked Questions (for International Buyers)
Q: What is the difference between pre-galvanized tube and hot-dip galvanized (HDG) tube?
A: Pre-galvanized tubes are made from strip that was galvanized before forming and welding; coating is typically thinner and may be absent on weld seams.
Hot-dip galvanized tubes are galvanized after fabrication—this yields more uniform and heavier external zinc coverage including welds and internal surfaces (if dipped), offering superior corrosion protection.
Q: How do I specify pipe size and wall thickness to match my fittings?
A: Provide outer diameter (OD) and exact wall thickness (or schedule/nominal WT).
Many fittings and couplers are sized by OD; for structural uses, state OD x WT. Include tolerances and whether nominal or actual dimensions are required.
Q: What coating mass should I request for outdoor or coastal use?
A: For general outdoor use Z120–Z275 g/m² is common.
In highly aggressive coastal or industrial environments, specify higher coating mass (Z275+) or consider additional protective painting.
State whether coating mass is total (both sides) or per side.
Q: Can galvanized pipe be welded or threaded on site?
A: Yes. Galvanized pipes can be welded (follow safe practices due to zinc fumes) and threaded (use proper cutting oils and protect threads).
If threading after galvanizing, consider re-galvanizing or applying protective coatings to exposed areas.
Q: Do you provide ends threaded or will I need onsite machining?
A: End finishing (threading, beveling, grooving) is available on request—specify thread standard (NPT, BSP, ISO) or bevel angle in the purchase order.
Pre-finished ends save onsite work and ensure consistent tolerance.
Q: How should I store galvanized pipe on site to avoid corrosion or damage?
A: Store under cover on supports to prevent standing water. Keep pipes clear of soil and chemical exposure. Protect open ends with caps to prevent debris and internal corrosion. Avoid stacking incompatible coatings together.
Contact our sales team today for a quotation or to discuss your project requirements. We are committed to providing high-quality galvanized round pipes that meet your exact specifications and delivery deadlines.
Your trusted partner in galvanized steel solutions.For further technical information, pricing, or customization, please contact our sales team:
Tel/WA/Wechat: +86 13225105678
Email: sales01@duohessplate.com
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