Galvanized Seamless Pipe: Lightweight Corrosion-Resistant Solution for High-Stress Applications.
Engineered for Efficiency: Oil/Gas, Construction & Chemical Processing.
Galvanized seamless pipes offer 80% weight reduction vs. carbon steel (density: 7.85 g/cm³) while maintaining 400–550 MPa tensile strength. Their Z275 hot-dip galvanized coating provides 2,000+ hours of salt spray resistance (ASTM B117), outperforming welded pipes in acidic/alkaline environments like offshore platforms and chemical reactors.
Certifications & Key Advantages
- ASTM A53 & EN 10255 Certified: Compliant with API 5L and ISO 1461 standards.
- Cost Savings: 25% lower installation costs due to 1:5 weight-to-strength ratio vs. square steel.
- Custom Sizing: Thickness 0.1–300 mm (±0.15 mm), OD up to 500 mm.
- MOQ 5 Tons: HDG (hot-dip) or electroplated finishes available.
Technical Specifications
Mechanical Properties
| Property | Value | Test Standard |
|---|---|---|
| Yield Strength | 250–350 MPa | ISO 6892-1 |
| Tensile Strength | 400–550 MPa | ASTM E8/E8M |
| Elongation (A50) | ≥20% | EN ISO 6892-2 |
| Zinc Coating | 180–275 g/m² (Z275) | EN 1461 |
Material Composition:
- Carbon (C): ≤0.25%
- Manganese (Mn): 0.30–1.40%
- Silicon (Si): 0.10–0.35%
- Phosphorus (P): ≤0.035%
Coating Details:
- Hot-Dip Galvanizing (HDG): 50–85 µm layer (Z275-Z450).
- Electroplating (EG): 8–15 µm for indoor/low-corrosion use.
- Surface Prep: ISO 8501-1 Sa2.5 blasting (40–70 µm profile).
Dimensional Tolerances
| Parameter | Tolerance |
|---|---|
| Wall Thickness | ±10% of nominal size |
| Outer Diameter | ±1.0% of OD |
| Straightness | ≤1.5 mm/m |
Applications
- Oil/Gas: Submarine pipelines, refinery heat exchangers.
- Construction: Earthquake-resistant building frames, roof trusses.
- Chemical: Sulfuric acid transport lines, fertilizer reactors.
- Energy: Geothermal steam conduits, nuclear waste containers.
Fabrication Guidelines
- Cutting: Cold sawing (feed rate ≤0.3 mm/rev for HDG).
- Welding: Use E6013 electrodes (preheat 150–200°C).
- Bending: Minimum radius = 3x pipe diameter.
- Painting: Apply inorganic zinc primer (5 µm) + polyurethane (25 µm).
Quality Assurance
- Coating Adhesion: ASTM D6677 cross-hatch test (Class 1B).
- Hydrostatic Test: 30 MPa pressure held for 10 sec (API 5L).
- Certifications: PED 2014/68/EU, ASME B36.10M, and ISO 9001:2015.
Competitive Edge
- Lifespan: 20–35 years in pH 2–12 environments.
- Lead Time: 18–28 days (MOQ 5 tons).
- Sustainability: 100% recyclable with 30% lower carbon footprint vs. PVC.
Logistics & Compliance
- Packaging: VCI film + wooden crates (ISPM15 certified).
- Temperature Range: -40°C to 450°C (HDG), -10°C to 300°C (EG).
- Optional Coatings: Xylan® or ceramic-polymer hybrid upon request.
Logical Connectors:
- Comparison: While PVC resists chemicals, HDG pipes handle 5x higher pressure.
- Example: For instance, these pipes are used in Arctic oil drilling rigs.
- Cause-Effect: Z275 coating (275 g/m²) prevents rust in saltwater splash zones.
Comparative Analysis
| Material | Tensile Strength (MPa) | Corrosion Resistance | Key Applications |
|---|---|---|---|
| Galv. Seamless | 400–550 | Extreme (pH 2–12) | Refineries, Chemical plants |
| Carbon Steel ERW | 330–460 | Moderate | Water supply lines |
| PVC Schedule 80 | 50 | High | Drainage systems |
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Certifications: API, ASME, ISO. Global logistics network.
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