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Help CenterSteel Pipe & Tube & Hot-dip Galvanized Steel Pipe，DN15、DN20、DN25、DN32、DN40、DN50、DN65、DN80、DN100、DN125、DN150、DN200
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I. Product Overview
Hot-dip galvanized steel pipe takes hot-rolled or cold-rolled steel strip/coil as the base material, which is formed by high-frequency welding, and then a uniform, dense and strongly adherent zinc layer is attached to the inner and outer surfaces of the pipe through the hot-dip galvanizing process, thereby greatly improving the corrosion resistance, rust resistance and weather resistance of the pipe. It is widely used in water supply and drainage, fire protection, gas, municipal engineering, power threading, steel structure, greenhouse support and other fields, with long service life, convenient installation, safety and reliability.
II. Production Process
1. Base Material Selection: High-quality steel strips such as Q195, Q235B and Q355B are selected.
2. Welded Pipe Forming: High-frequency straight seam welding, sizing, straightening and cutting.
3. Pickling Pretreatment: Remove oil, oxide scale and rust.
4. Solvent Assisted Plating: Improve the adhesion of the zinc layer.
5. Hot-Dip Galvanizing: Immerse in molten zinc solution at about 450℃ to form a zinc-iron alloy layer + pure zinc layer.
6. Cooling, Passivation and Finishing: Improve surface finish and corrosion resistance.
7. Inspection, Packaging and Warehousing.
III. Product Specifications
- Caliber Range: DN15 (1/2"), DN20 (3/4"), DN25 (1"), DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN200, etc.
- Outer Diameter: 21.3mm～219.1mm
- Wall Thickness: 1.0mm～6.0mm
- Length: Fixed length of 6 meters (customizable to 4 meters, 5.8 meters, 12 meters, etc.)
- Executive Standard: GB/T 3091-2015 Welded Steel Pipes for Low Pressure Fluid Transportation
- Zinc Layer Standard: Internal and external galvanizing, zinc layer weight ≥300g/m², national standard zinc layer
IV. Material Grades and Chemical Composition (Mass Fraction, %)
Material Grade |
C (Carbon) |
Si (Silicon) |
Mn (Manganese) |
P (Phosphorus) ≤ |
S (Sulfur) ≤ |
Nb (Niobium) ≤ |
V (Vanadium) ≤ |
Ti (Titanium) ≤ |
Alt (Aluminum Total) ≥ |
Q195 |
≤0.12 |
≤0.30 |
0.25～0.50 |
0.045 |
0.050 |
- |
- |
- |
0.020 |
Q235B |
≤0.17 |
≤0.35 |
0.30～0.70 |
0.045 |
0.045 |
- |
- |
- |
0.020 |
Q355B |
≤0.24 |
≤0.55 |
1.00～1.60 |
0.035 |
0.035 |
0.06 |
0.12 |
0.12 |
0.020 |
Zinc Layer |
Pure zinc layer Zn: ≥99.9%; Zinc-iron alloy layer (transition layer): Zn-Fe alloy phase, with firm bonding. |
V. Product Features
1. Strong Corrosion and Rust Resistance: The zinc layer forms anodic protection, effectively resisting corrosion from rain, humidity, acid and alkali environments.
2. Uniform and Firm Zinc Layer: Full coverage of inner and outer walls, strong adhesion, not easy to fall off and rust.
3. Smooth and Beautiful Surface: Silver bright appearance, can be directly used for exposed projects without additional painting.
4. Good Mechanical Properties: High strength, good toughness, strong impact resistance and pressure resistance.
5. Convenient Connection: Can be connected by thread, groove, flange and welding.
6. Wide Application Range: Suitable for indoor and outdoor use, resistant to high and low temperatures, service life can reach more than 20 years.
7. Environmental Protection and Safety: Non-toxic and tasteless, suitable for projects with high safety requirements such as drinking water, fire protection and gas.
VI. Main Applications
- Municipal Water Supply and Drainage Engineering: Tap water transportation pipelines.
- Fire Protection System: Fire sprinkler pipes, main fire pipes, fire hydrant pipes.
- Gas Transmission: Low-pressure transmission pipelines for natural gas and liquefied gas.
- Power and Communication: Cable threading pipes and protective sleeves.
- Construction Engineering: Steel structure columns, scaffolding pipes, curtain wall keels.
- Agricultural Facilities: Vegetable greenhouses and breeding greenhouse frames.
- Industrial Pipes: Ventilation pipes, low-pressure fluid transmission, chemical anti-corrosion pipes.
- Expressways and Rail Transit: Guardrails, brackets and embedded parts.
VII. Packaging, Transportation and Production Cycle
- Packaging: Export-standard bundling packaging, steel strip bundling, end capping protection, moisture and rust proof.
- Transportation: Suitable for container transportation and whole-vehicle transportation, not easy to be damaged by collision.
- Production Cycle: 5-7 days for conventional specifications.
VIII. Quality Assurance
- Products comply with GB/T 3091-2015 national standard.
- Provide original factory material certificate and zinc layer test report.
- Zinc layer thickness, dimensional tolerance and mechanical properties all meet national standard requirements.
- Support inspection by third-party testing institutions.
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