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Help CenterSteel Pipe & Tube & Hot Dip Galvanized Steel Pipe，Q195, Q215, Q235 (A/B/C), Q355 (A/B/C), 20#, 45#
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1. Product Introduction
Hot dip galvanized (HDG) steel pipe is made by immersing carbon steel pipe into molten zinc at high temperature (450-460℃), forming a dense zinc-iron alloy layer and a pure zinc layer on the surface. This double-layer coating provides excellent corrosion resistance, rust prevention, and durability, effectively extending the service life of the steel pipe. It is widely used in water supply and drainage, fire protection, gas transmission, construction engineering, agricultural greenhouses, and industrial fluid conveying fields.
2. Material & Standards
We offer a full range of standard materials, supporting customization of special grades to meet diverse project requirements.
Chinese Standard: Q195, Q215, Q235 (A/B/C), Q355 (A/B/C), 20#, 45#
Japanese Standard: SS400, SM490, STK400
European Standard: S235JR, S355JR, ST37-2, ST52-3
American Standard: A53, A106, A36
Other materials and grades available upon customer request
Material Grade |
C (Carbon) / (%) |
Si (Silicon) / (%) |
Mn (Manganese) / (%) |
P (Phosphorus) / (≤%) |
S (Sulfur) / (≤%) |
|---|---|---|---|---|---|
Q235B |
0.12-0.20 |
≤0.35 |
0.30-0.70 |
0.045 |
0.045 |
Q355B |
0.17-0.24 |
≤0.55 |
1.20-1.60 |
0.040 |
0.040 |
20# |
0.17-0.24 |
0.17-0.37 |
0.35-0.65 |
0.035 |
0.035 |
S235JR |
≤0.17 |
≤0.35 |
0.40-0.80 |
0.040 |
0.040 |
A36 |
0.25 |
0.40 |
1.00 |
0.040 |
0.050 |
3. Product Specifications
Standard specifications are in stock for immediate delivery; customized sizes, wall thicknesses and lengths are available to match specific project needs.
Outer Diameter: 15mm - 630mm
Wall Thickness: 1.5mm - 12mm
Length: 3m - 12m (customizable)
Zinc Coating Thickness: 60μm - 120μm (heavy zinc coating optional)
Pipe Type: Seamless HDG Pipe, Welded HDG Pipe (ERW, LSAW)
Tolerance: Outer diameter tolerance ±0.5mm, wall thickness tolerance ±0.1mm
4. Surface & Process
Surface State: Uniform zinc coating, smooth and bright, no peeling, no blistering, no rust
Processing Technology: Hot dip galvanizing, pickling, derusting, phosphating, annealing (optional)
Edge Condition: Smooth cut edge, no burr, no deformation
Coating Performance: Strong adhesion, wear-resistant, corrosion-resistant, suitable for harsh environments (humid, coastal, industrial areas)
5. Product Performance
Corrosion Resistance: Excellent anti-rust and anti-corrosion performance, service life up to 30-50 years in normal environment
Mechanical Properties: High strength, good toughness, impact resistance, suitable for high-pressure and heavy-load scenarios
Coating Quality: Dense zinc layer, uniform thickness, strong adhesion, not easy to fall off
Installability: Light weight, easy to cut, weld and install, compatible with various connecting methods (thread, flange, socket)
6. Application Fields
Water Supply & Drainage: Urban water supply pipelines, rural water conservancy projects, sewage discharge pipelines
Fire Protection: Fire sprinkler pipelines, fire hydrant pipelines, fire protection system supporting pipelines
Gas & Fluid Transmission: Natural gas pipelines, liquefied gas pipelines, industrial fluid conveying pipelines
Construction Engineering: Building scaffolding, structural support, water and electricity pipelines in buildings
Agriculture: Greenhouse frames, irrigation pipelines, farm water supply pipelines
Other Fields: Industrial equipment pipelines, coastal engineering, bridge support pipelines
7. Packing & Delivery
Packing: Bundled with steel strips, wrapped with waterproof plastic film, or customized packing (wooden cases, pallets) according to customer requirements; each bundle is labeled with material, specification, zinc coating thickness and production date.
Delivery Time: 5-7 working days for in-stock products
Shipping Method: By sea (FCL/LCL), by land (truck), by air (urgent orders).
Quality Certificate: Mill Test Certificate (MTC), Zinc Coating Test Report, and other relevant certificates provided.
8. Trade Terms
Supply State: In stock, customized production
Payment Terms: T/T (30% advance payment, 70% balance before delivery)
Trade Terms: EXW, FOB, CIF
9. Quality Assurance
All products undergo strict inspection before leaving the factory, including material composition, dimensional accuracy, zinc coating thickness, corrosion resistance and mechanical properties. We promise that the products meet international and national standards, and provide after-sales service. If there is any quality problem caused by our side, we will provide replacement or compensation in time.
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