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Help CenterSteel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215B、Q235B、Q275B、SPHC、20#、Q355B
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1. Product Overview
Hot Dip Galvanized Steel Pipe (HDG Pipe / GI Pipe) is manufactured by dipping welded or seamless carbon steel pipe into high-temperature molten zinc liquid. A durable zinc-iron alloy layer is metallurgically bonded to the steel substrate, providing superior anti-corrosion performance. Compared with cold galvanized (electro-galvanized) pipes, hot-dip galvanized pipes feature thicker coating, stronger adhesion, longer service life and full compliance with international engineering standards.
Cold galvanized pipes are strictly prohibited for pressure fluid, fire fighting and gas engineering projects due to thin coating, poor adhesion and short service life.
2. Product Classification
2.1 By Manufacturing Process
Hot Dip Galvanized Welded Steel Pipe (ERW): Mainstream export product. High-frequency welded pipe with uniform wall thickness, cost-effective, widely used for low-pressure fluid transmission, construction and structural support. Standard: GB/T 3091, ASTM A53, EN 10219.
Hot Dip Galvanized Seamless Steel Pipe: Seamless structure, high pressure resistance, suitable for high-pressure industrial fluid, chemical and mechanical engineering projects. Standard: GB/T 8163, ASTM A106.
Galvanized Square & Rectangular Pipe: Special structural pipe for building framework, guardrail, municipal engineering and steel structure projects. Standard: GB/T 6728, EN 10219.
2.2 By Pressure Grade
Standard Weight: Normal wall thickness, working pressure PN1.0MPa, for general water, air and irrigation systems.
Extra Heavy: Thickened wall, working pressure PN1.6MPa, for high-rise fire fighting, outdoor buried pipeline and gas transmission.
3. Material & International Standards
3.1 Steel Grade
Q195, Q215, Q235B, Q345B (Mild Carbon Steel). Low carbon content ensures excellent welding, threading, grooving and bending performance.
3.2 Executive Standards
Chinese Standard: GB/T 3091-2015, GB/T 13912, GB/T 8163
American Standard: ASTM A53 Gr.A/B, SCH40, SCH80
European Standard: EN 10219-1/2
Japanese Standard: JIS G3444
3.3 Mechanical Performance
Tensile Strength: ≥375MPa
Yield Strength: ≥235MPa
Elongation: ≥20%
Hydrostatic Test: 3.0MPa~5.0MPa (no leakage, no deformation)
Coating Weight: 275~600g/㎡; Coating Thickness: 35~85μm
4. Standard Specifications
Standard length: 6m / 12m; Custom length available (3m~12m). Pipe end treatment: Plain End, Threaded End (BSP/NPT), Grooved End, Flanged End.
Nominal Diameter |
Outer Diameter (mm) |
Standard Wall Thickness (mm) |
Extra Wall Thickness (mm) |
|---|---|---|---|
DN15 |
21.3 |
2.75 |
3.25 |
DN20 |
26.8 |
2.75 |
3.50 |
DN25 |
33.7 |
3.25 |
4.00 |
DN40 |
48.3 |
3.50 |
4.25 |
DN50 |
60.3 |
3.80 |
4.50 |
DN80 |
88.9 |
4.00 |
4.75 |
DN100 |
114.3 |
4.00 |
5.00 |
DN150 |
168.3 |
4.50 |
6.00 |
DN200 |
219.1 |
6.00 |
7.00 |
5. Core Advantages
Dual Anti-corrosion Protection: Zinc layer isolates air and moisture; sacrificial anode protection prevents steel substrate rusting. Salt spray test ≥720 hours without red rust.
High Mechanical Strength: Excellent compression, impact and bending resistance, suitable for overhead, buried and outdoor harsh environments.
Easy Processing & Installation: Support threading, grooving, welding, cutting and bending. Complete pipe fittings for quick construction.
Smooth Inner Wall: Low fluid resistance, no scaling blockage, stable fluid transmission performance.
Long Service Life: 15~30 years service life in atmospheric environment, low maintenance cost, high comprehensive cost performance.
6. Wide Applications
Construction Engineering: Fire fighting sprinkler & hydrant pipeline, building water supply & drainage, HVAC circulation system.
Fluid Transmission: Low-pressure gas, air, oil, industrial circulating water and irrigation pipeline.
Municipal & Traffic: Road guardrail, street light pole, bridge steel structure, power support frame.
Agriculture & Industry: Greenhouse framework, farm irrigation pipeline, factory equipment support.
7. Limitations
Not applicable for pure drinking water long-term transmission.
Not suitable for strong acid, strong alkali and high chlorine corrosive medium.
Not used for medium temperature over 100℃ high-temperature pipeline.
8. Quality Inspection & QC
100% Hydrostatic pressure test & visual appearance inspection
Zinc coating thickness test, adhesion test, dimension tolerance inspection
Certificates: ISO9001, Factory Test Certificate, Mill Certificate
9. Export Packaging & Shipping
Packaging: Standard export packing with plastic pipe caps, steel strapping, waterproof woven bag; bundled firmly for sea transportation.
Trade Terms: EXW, FOB, CFR, CIF, DDP
Payment Terms: 30% T/T deposit, 70% balance before shipment; L/C at sight available
Delivery Time: 3~7 working days
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