Galvanized round pipe is carbon steel pipe with circular cross-section after galvanization. It adopts two anti-rust treatments: hot-dip galvanizing and electro-galvanizing. In terms of manufacturing process, it is divided into welded pipe and seamless pipe. Hot-dip galvanized welded round pipe is the most popular option.
As a professional manufacturer and supplier, Glory Steel offers customizable galvanized round pipes in different zinc coating thicknesses, wall thicknesses, outer diameters and lengths. We supply ERW straight seam welded pipe, SSAW spiral welded pipe and seamless pipe. Our products are widely applied in steel structure, construction and municipal engineering.
Specifications
| Item | Galvanized Round Tubing |
| Material | Q235, Q235B, Q345, Q345B, Q195, Q215, St37, St42, St37-2, St35.4, St52.4, SAE 1006/1008, ASTM A53 Grade B |
| Technique | Welded/Seamless, Cold Drawn/ Hot Rolled |
| Surface Treatment | Zinc Coated |
| Zinc Layer | Z30-Z275 |
| Standard | ASTM A53, BS 1387, EN 10219, DIN 2440, JIS G3444, GB/T 3091, ISO 1461 |
| OD | 20mm ~ 508mm |
| WT | 1.0mm ~ 40mm |
| Length | 6m / 12m / 6.4m |
| Processing Services | Cutting, Bending, Beveling, Threading, Expanding |
| End Finish | Plain, Beveled, Threaded + Coupling |
Advantages of Galvanized Round Tubing
- Excellent Anti-corrosion Performance – The hot-dip zinc coating effectively resists erosion from atmosphere and media. Its service life can exceed 20 years, much longer than ordinary black steel pipes.
- Superior Mechanical Properties – The pipe supports various deep processing including threading, bending and welding. It features high load-bearing capacity, pressure resistance and stable performance.
- Cost-effective – It is an ideal choice with reliable anti-rust performance and competitive price. Low maintenance cost allows direct on-site use.
- Various Specifications & Nice Appearance – It presents a silvery white surface with or without spangle available. A full range of specifications can match different project demands.
Application Fields
- Construction: Building supports, guardrail posts, posts & rails for chain link fence, handrails of prefabricated dormitories.
- Municipal & Traffic Engineering: Water supply, drainage, irrigation works, cable trays, lamp posts and billboard columns.
- Industrial Use: Factory brackets, equipment bases, oil delivery pipelines, and fire sprinkler pipes.
- Other Usage: Warehouse shelves, fitness equipment frames, shelter frames, marine ventilation pipes, greenhouse and breeding shed frames.
Common Material Grades
| GB/T 3091 (China) | ASTM A53 (USA) | EN 10219 (Europe) | BS 1387 (UK) | JIS G3444 (Japan) |
|---|---|---|---|---|
| Q195 | Grade A | S235JR | Class A | STK400 |
| Q215 | Grade B | S275J0H | Class B | STK490 |
| Q235B | Grade B | S355J2H | Class C | STK540 |
Additional notes
SS400: Japanese standard material, conforming to JIS G3101 standard, applicable to steel plates, flat steel, and structural steel (I-beams, channel steel, angle steel), specifically referring to structural steel, not a dedicated steel pipe standard.
Galvanizing Processes
Zinc coating protects the steel substrate from oxidation, so galvanized pipe is a composite of steel and zinc. A thicker zinc layer means better anti-rust ability.
Hot-dip Galvanized Round Pipe
The mainstream process. Steel pipes are fully immersed in molten zinc liquid. It forms thick, firm and controllable zinc coating with typical zinc spangles on surface.
Electro-galvanized Round Pipe
Zinc ions adhere to the pipe surface via electrolysis. The coating is thin with limited anti-corrosion effect but bright finish, suitable for dry indoor environments.
Production Process
ERW Welded Galvanized Pipe (Mainstream)
Raw hot rolled or cold rolled steel strips are formed into a tubular shape and welded into black pipes, then processed by hot-dip galvanizing.
Seamless Galvanized Pipe
Solid steel billets are pierced and rolled into seamless black pipes before hot-dip galvanizing. It is mainly used for high pressure and high temperature working conditions.
Standard Size & Wall Thickness Chart
| NPS (Inch) | DN | OD (mm) | WT (mm) |
| 1/2″ | DN15 | 21.3 | 2.8 / 3.2 |
| 3/4″ | DN20 | 26.9 | 2.8 / 3.5 |
| 1″ | DN25 | 33.7 | 3.2 / 4.0 |
| 1.2″ | DN32 | 42.4 | 3.5 / 4.0 |
| 1.5″ | DN40 | 48.3 | 3.5 / 4.0 |
| 2″ | DN50 | 60.3 | 3.8 / 4.5 |
| 2.5″ | DN65 | 76.1 | 4.0 / 4.5 |
| 3″ | DN80 | 88.9 | 4.0 / 4.0 |
| 4″ | DN100 | 114.3 | 4.0 / 5.0 |
| 5″ | DN125 | 140.0 | 4.5 / 5.5 |
| 6″ | DN150 | 165.0 | 4.5 / 5.5 |
| 8″ | DN200 | 219.1 | 6.0 / 6.0 |
| 10″ | DN250 | 273.0 | 6.0 / 6.0 |
| 12″ | DN300 | 323.8 | 6.0 / 6.0 |
Available Zinc Coating Thickness
- Z30-Z60: Coating thickness 30-50μm, zinc weight 30-60g/㎡. For indoor or temporary outdoor use.
- Z80-Z120: Coating thickness 60-80μm, zinc weight 400-550g/㎡. Standard coating for general civil engineering.
- Z200-Z275: Coating thickness 85-120μm, zinc weight 600-850g/㎡. Heavy-duty coating for strong sunlight, humid and coastal areas.
Why Choose Glory Steel
- Strict Quality Control – We conduct full production inspection from raw steel strips to finished pipes in accordance with international standards.
- Customization Service – Custom zinc layer, material and dimensions are available for harsh environments such as desert, cold and snowy areas.
- Abundant Stock & One-stop Processing – Sufficient ready goods. We provide various pipe end treatments to support one-stop procurement and processing.
- Competitive Factory Price – As a direct manufacturer, we offer favorable prices to help clients cut costs and gain more profits.
Glory Steel factory, located in Tianjin, China, is an ISO 9001, ISO 14001, and CE certified factory with an annual output of 100,000 tons. We specialize in manufacturing Galvanized round pipe, galvanized square pipe, galvanized scaffolding pipe/electrical conduit/culvert. With our high-quality products and services, we export to over 120 countries.
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