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Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235BNegotiableMOQ: 5 Metric Tons -
Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235BNegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235BNegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235BNegotiableMOQ: 5 Metric Tons
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Steel H Beam & H Beam In Stock，Q235B、Q355B、 Q235C/D、Q355C/D/E 、Q460NegotiableMOQ: 5 Metric Tons
Galvanized Steel Pipe – Detailed Product Description
1. Product Overview
Galvanized steel pipe is a carbon steel pipe coated with a layer of zinc on the surface, featuring excellent anti-corrosion and rust-proof performance to greatly extend service life. It is mainly divided into hot-dip galvanized and cold galvanized by production technology. Hot-dip galvanized pipe is the mainstream choice for engineering applications.
2. Production Process
Hot-dip Galvanized (Mainstream)
Pickling: Remove oxide scale and rust on the steel pipe surface.
Cleaning: Neutralize and rinse with ammonium chloride / zinc chloride solution.
Hot dipping: Soak the pipe in molten zinc liquid at about 450℃ to form a zinc-iron alloy layer plus a pure zinc layer with strong adhesion.
Cooling, passivation, inspection and warehousing.
Cold Galvanized (Phased Out)Adopting electroplating technology with thin zinc layer (10–50 g/m²), poor adhesion and weak corrosion resistance. It is prohibited by national standards for water supply, drainage and gas pipelines.
3. Material & Executive Standards
Base material: High-quality low carbon steel Q195, Q215, Q235B, complying with GB/T 700.
Standard for galvanized pipe: GB/T 3091-2025 Welded Steel Pipe for Low-pressure Fluid Transportation.
Zinc coating requirement: Zinc coating weight of standard hot-dip galvanized pipe ≥ 275 g/m², reinforced pipe ≥ 400 g/m².
4. Common Specifications
Nominal diameter: DN15–DN200, standard fixed length: 6 meters per piece (customized length available).
| Nominal Diameter | Outer Diameter (mm) | Wall Thickness (mm) | Theoretical Weight (kg/m) |
|---|---|---|---|
| DN15 (1/2") | 21.3 | 2.5–2.8 | 1.16–1.27 |
| DN20 (3/4") | 26.9 | 2.5–2.8 | 1.50–1.63 |
| DN25 (1") | 33.7 | 2.8–3.2 | 2.11–2.41 |
| DN50 (2") | 60.3 | 3.5–3.8 | 4.00–4.37 |
| DN100 (4") | 114.3 | 4.0–4.5 | 10.85–12.15 |
| DN150 (6") | 168.3 | 4.5–6.0 | 18.60–24.00 |
5. Core Performance
Superior Corrosion Resistance: The zinc layer isolates water, oxygen and acid-base media, with service life over 20 years for outdoor and buried installation.
Reliable Mechanical Property: Yield strength ≥ 235 MPa, tensile strength 370–500 MPa, suitable for low-pressure fluid transportation and structural support.
Convenient Connection: Support threaded, grooved, welded and flange connection methods for high construction efficiency.
Economical & Safe: Cost-effective compared with stainless steel; non-toxic zinc layer meets environmental protection standards.
6. Main Application
Fire protection system: Fire hydrant and sprinkler pipeline.
Building water supply & drainage: Domestic water, rainwater and sewage pipeline (excluding drinking water direct supply).
Gas transportation: Low-pressure pipeline for natural gas and liquefied petroleum gas.
Municipal engineering: Buried pipe network, road guardrail and lamp pole.
Industrial pipeline: Ventilation, dust removal, circulating cooling water and cable protection pipe.
Steel structure: Factory support, truss and greenhouse frame.
7. Hot-dip Galvanized VS Cold Galvanized
Hot-dip Galvanized: Thick coating (60–100 μm), uniform layer, strong adhesion, long service life, national standard recommended, slightly higher price.
Cold Galvanized: Thin coating (5–15 μm), easy to peel off, short service life, forbidden for water and gas pipeline, low price.
8. Installation & Maintenance
Cutting: Use abrasive cutter or plasma cutter; polish the end and repair zinc coating in time to avoid rusting.
Connection:Thread connection: Commonly used for DN≤50mm, processed thread after galvanizing with sealing tape.Grooved connection: Preferred for DN≥65mm, fast installation and good sealing performance.Welding: Use special welding wire; paint zinc-rich anti-corrosion paint after welding.
Maintenance: Regular inspection to avoid scratch on zinc layer; apply special anti-corrosion paint for outdoor use to prolong service life.
9. Packaging & Delivery
Packaging: Plastic end caps at both ends, bundled in standard 6m length; labeled with specification, batch number and certificate.
Delivery Time: 5–7 days for regular specifications with sufficient stock.
10. Quality Assurance
All products comply with GB/T 3091-2025, providing material certificate, zinc coating test report and factory certificate.
Zinc layer uniformity: No red rust after 5 times copper sulfate immersion test.
Mechanical properties: Yield strength, tensile strength and elongation fully meet national standards.
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