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Help CenterSteel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235B、GB/T 3091-2025
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Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235B、GB/T 3091-2025NegotiableMOQ: 5 Metric Tons -
Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235B、GB/T 3091-2025NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235B、GB/T 3091-2025NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235B、GB/T 3091-2025NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Galvanized Steel Pipe，Q195、Q215、Q235B、GB/T 3091-2025NegotiableMOQ: 5 Metric Tons
Galvanized Steel Pipe Detailed Product Description
Galvanized steel pipe refers to welded steel pipes with hot-dip galvanized coating (cold-galvanized pipes have been phased out). It combines high steel strength and excellent anti-corrosion performance of zinc coating, widely used for low-pressure fluid transportation, fire protection, building structures and other fields, manufactured in accordance with national standard GB/T 3091-2025.
1. Product Definition & Classification
1.1 Definition
Made of low-carbon steel base material such as Q195, Q215, Q235, formed by high-frequency welding, then processed by hot-dip galvanizing technology to form uniform zinc-iron alloy layer and pure zinc layer on surface, also known as white iron pipe.
1.2 Classification by Production Process
Hot-dip Galvanized Steel Pipe (Mainstream)Immersed in molten zinc liquid at 450℃±5℃, featuring thick zinc coating above 70μm, strong adhesion and service life of 20-30 years. Suitable for water supply, gas and fire protection pipeline systems.
Cold-galvanized Steel Pipe (Prohibited)Electro-galvanized with thin and easy-to-fall zinc layer, poor corrosion resistance. It has been officially banned for water and gas transportation projects.
1.3 Classification by Usage
Low-pressure fluid delivery pipe, fire fighting dedicated pipe, building scaffolding pipe, electrical threading pipe, agricultural irrigation pipe.
2. Material & Core Technical Parameters
2.1 Base Material
Main material: Q235B, yield strength ≥235MPa, tensile strength 370-500MPa, elongation ≥20%.Optional materials: Q195, Q215, Q345B.Chemical composition: Carbon ≤0.22%, Sulfur & Phosphorus ≤0.045%, with good welding performance and ductility.
2.2 Galvanized Layer Parameters
Zinc coating thickness: Standard grade 70-85μm, thickened grade ≥85μm.Zinc coating weight: ≥500g/㎡.Surface appearance: Silvery metallic luster, no missing galvanization, black spots or bubbles.
3. Standard Specifications
| Nominal Diameter | Inch | Outer Diameter(mm) | Standard Wall Thickness(mm) | Reinforced Wall Thickness(mm) | Theoretical Weight(kg/m) |
|---|---|---|---|---|---|
| DN15 | 1/2" | 21.3 | 2.75 | 3.25 | 1.26 |
| DN20 | 3/4" | 26.9 | 2.75 | 3.50 | 1.63 |
| DN25 | 1" | 33.7 | 3.25 | 4.00 | 2.42 |
| DN32 | 1¼" | 42.4 | 3.50 | 4.25 | 3.14 |
| DN40 | 1½" | 48.3 | 3.50 | 4.25 | 3.58 |
| DN50 | 2" | 60.3 | 3.75 | 4.50 | 4.88 |
| DN65 | 2½" | 76.1 | 4.00 | 4.75 | 6.64 |
| DN80 | 3" | 88.9 | 4.00 | 4.75 | 7.38 |
| DN100 | 4" | 114.3 | 4.00 | 5.00 | 10.88 |
| DN150 | 6" | 168.3 | 4.50 | 6.00 | 18.18 |
Standard length: 6m, 9m, 12m; Custom length available from 3m to 12m.
4. Production Technology
Strip steel uncoiling → straightening → high-frequency welding → fixed-length cutting → burr removal → degreasing & pickling → flux coating & drying → hot-dip galvanizing → cooling & passivation → quality inspection → finished product packaging.
5. Product Advantages
Strong anti-corrosion ability, effectively isolate air and water to prevent rust.
High mechanical strength, bear working pressure up to 1.6MPa.
Easy installation, support thread connection, flange connection and groove connection.
Stable performance, low maintenance cost and high cost performance.
6. Executive Standards & Quality Inspection
Main execution standards: GB/T 3091-2025, GB/T 13793-2016, GB/T 700-2006.Inspection items: Appearance inspection, zinc coating thickness test, tensile test, flattening test, zinc layer uniformity test.
7. Application Scope
Water supply and drainage engineering, low-pressure gas transmission, fire protection pipeline system, building construction scaffolding, agricultural irrigation, cable protection pipeline and industrial ventilation pipeline.
8. Installation Notes
Choose qualified hot-dip galvanized pipes strictly.
Avoid direct welding to prevent damage to galvanized layer; conduct anti-rust treatment after welding.
Buried pipelines shall be coated with anti-corrosion coating for longer service life.
9. Packaging & Delivery
Packed in bundles with steel strips, plastic end caps equipped to avoid collision damage.
Support land transportation and sea transportation, delivery cycle 5-7 working days
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