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Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235B、Q355BNegotiableMOQ: 5 Metric Tons -
Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235B、Q355BNegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235B、Q355BNegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235B、Q355BNegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235B、Q355BNegotiableMOQ: 5 Metric Tons
Galvanized Steel Pipe Detailed Product Description
1. Product Definition
Galvanized Steel Pipe is a carbon steel pipe coated with a layer of zinc on the surface to enhance anti-corrosion and rust-proof performance. It is divided into Hot-dip Galvanized Pipe and Electro-galvanized Pipe according to production technology, and hot-dip galvanized pipe is the mainstream for engineering applications.
2. Material & Execution Standard
Base material: Low carbon steel Q195 / Q215 / Q235B, complying with GB/T 700 standard.
Hot-dip galvanized pipe: Implement standard GB/T 3091-2015 (Low-pressure Fluid Transportation Steel Pipe).
International standards: ASTM A53, JIS G3442 and other mainstream international specifications.
3. Production Process (Hot-dip Galvanizing)
Pickling: Remove surface oxide scale and rust stains.
Cleaning: Neutralize and clean with ammonium chloride and zinc chloride solution.
Hot-dip Galvanizing: Immerse the pipe in molten zinc liquid at about 450℃ to form a zinc-iron alloy layer and pure zinc protective layer.
Cooling, passivation, quality inspection and warehousing.
Electro-galvanized pipe features thin zinc layer (10–50 g/m²), poor adhesion and easy peeling off. It is prohibited by the housing and urban-rural development department for water supply and gas pipeline projects.
4. Standard Specifications & Parameters
Nominal Diameter DN: 15–300 mm (1/2"–12")
Conventional Length: 6 meters per piece, customized length from 3m to 12m is available.
| Nominal Diameter | Outer Diameter (mm) | Common Wall Thickness (mm) | Theoretical Weight (kg/m) |
|---|---|---|---|
| DN15 | 21.3 | 2.5–2.8 | 1.16–1.27 |
| DN20 | 26.9 | 2.5–2.8 | 1.50–1.63 |
| DN25 | 33.7 | 2.8–3.2 | 2.11–2.41 |
| DN50 | 60.3 | 3.5–3.8 | 4.22–4.54 |
| DN100 | 114.3 | 4.0–4.5 | 10.85–12.15 |
Zinc Coating Weight: ≥275 g/m² (national standard); ≥400 g/m² is recommended for outdoor use.
Pressure Bearing Capacity: Ordinary type 1.6 MPa; reinforced type 2.5–3.0 MPa.
5. Product Performance Characteristics
Excellent Corrosion Resistance: Adopt sacrificial anode protection of zinc layer, service life up to 20–30 years in conventional environment.
Good Mechanical Properties:Yield Strength: ≥235 MPaTensile Strength: 370–500 MPaElongation: ≥20%
Convenient Connection: Suitable for thread connection, welding, grooved connection and flange connection.
Cost-Effective: Lower price than stainless steel pipe, better strength and durability than plastic pipe.
6. Main Application
Fire Protection System: Sprinkler and fire hydrant pipeline (hot-dip galvanized pipe is the first choice).
Construction Water Supply & Drainage: Domestic water supply, rainwater and sewage pipeline.
Gas Transportation: Low-pressure natural gas and coal gas transmission pipeline.
HVAC System: Cooling water, steam and heating pipeline.
Municipal Engineering: Buried pipeline in residential areas, road guardrail and street lamp pole.
Agriculture & Industry: Greenhouse frame, irrigation, ventilation and dust removal pipeline.
7. Connection Methods
Thread Connection: Applied to DN15–DN50, widely used in home decoration and small-caliber projects.
Grooved Connection: Applied to DN65–DN200, featured with fast installation for fire protection and municipal engineering.
Welding Connection: Suitable for large-caliber and high-pressure occasions with good sealing performance and low cost.
Flange Connection: Used for high-pressure occasions and pipelines requiring frequent disassembly, matched with galvanized flange.
8. Quality Inspection Standard
Appearance: Smooth surface, no missing galvanization, peeling or bulging, uniform silver-gray color.
Zinc Layer Thickness: ≥85 μm for hot-dip galvanized pipe, no red discoloration after 5 times of copper sulfate test.
Mechanical Test: Tensile test, flattening test and bending test (DN≤50mm, no crack after 90° bending).
Hydrostatic Pressure Test: Keep pressure at 2.5 MPa for 15 seconds without leakage.
9. Packaging & Delivery
Packaging: 6 meters per piece, both ends with plastic end caps, bundled in units of 50–100 pieces.
Shipping: Delivery from Tianjin Port & Sihang Warehouse, delivery cycle 5–7 working days.
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