DX51D Galvanized Steel Pipe: High-Formability Corrosion-Resistant Solution for Low-Temperature Applications.
Engineered for Precision Fabrication: Construction, HVAC & Food Processing
DX51D galvanized steel pipe combines low melting point (1,425–1,535°C) with superior zinc adhesion (Z275 coating), achieving 10–15% higher formability than standard galvanized steel. Its micro-alloyed composition ensures 2,000+ hours of salt spray resistance (ASTM B117), making it ideal for cold-forming applications like agricultural equipment, ventilation ducts, and food processing machinery exposed to -30°C environments.
Certifications & Key Advantages
- EN 10346 & ASTM A653 Certified: Compliant with JIS G3302 and GB/T 13912 standards.
- Cost Efficiency: 40% lower welding energy vs. stainless steel 304.
- Custom Sizing: Thickness 0.1–300 mm (±0.15 mm), width up to 3 meters.
- MOQ 2 Tons: Hot-dip galvanized (HDG) finish standard; electroplating optional.
Technical Specifications
Mechanical Properties
| Property | Value | Test Standard |
|---|---|---|
| Yield Strength | 220–320 MPa | ISO 6892-1 |
| Tensile Strength | 330–440 MPa | ASTM E8/E8M |
| Elongation (A80) | ≥22% | EN ISO 6892-2 |
| Zinc Coating | 180–275 g/m² (Z275) | EN 1461 |
Material Composition:
- Carbon (C): ≤0.08%
- Manganese (Mn): 0.30–0.60%
- Phosphorus (P): ≤0.035%
- Silicon (Si): ≤0.03%
Coating Details:
- Hot-Dip Galvanizing (HDG): 50–85 µm layer (Z275-Z450 grades).
- Surface Prep: ISO 8501-1 Sa2.5 blast cleaning (25–50 µm profile).
Dimensional Tolerances
| Parameter | Tolerance |
|---|---|
| Thickness | ±0.15 mm |
| Outer Diameter | ±0.6% of nominal size |
| Length | ±10 mm |
Applications
- Construction: Roof drainage systems, cable trays, and fireproof door frames.
- Agriculture: Greenhouse structures, fertilizer storage tanks, and milking equipment.
- Food Industry: Conveyor belts, refrigeration pipelines, and meat processing tools.
- Energy: Solar panel mounts, biogas digesters, and geothermal heat exchangers.
Fabrication Guidelines
- Cutting: Laser/waterjet (pre-heat >100°C for HDG).
- Welding: Use ER70S-2 electrodes (preheat 80–120°C).
- Bending: Minimum radius = 2x pipe diameter (cold-formed).
- Painting: Apply chromate primer (5 µm) + PU topcoat (25 µm).
Quality Assurance
- Coating Adhesion: ASTM D3359 cross-hatch test (Class 4B rating).
- Salt Spray Test: 1,500+ hours (ASTM B117) for HDG pipes.
- Certifications: EN 10204 3.1, ISO 9001:2015, and RoHS compliance.
Competitive Edge
- Lifespan: 25–40 years in humid/coastal zones.
- Lead Time: 12–18 days (MOQ 2 tons).
- Sustainability: 98% recyclable with 15% lower CO₂ footprint than galvanized aluminum.
Logistics & Compliance
- Packaging: VCI-coated paper + steel straps (ISPM15 compliant).
- Temperature Range: -30°C to 250°C (HDG).
- Optional Coatings: Epoxy-polyester hybrid or fluoropolymer upon request.
Logical Connectors:
- Comparison: While aluminum resists oxidation, DX51D offers superior weldability.
- Example: For instance, DX51D pipes are used in Arctic oil pipelines.
- Cause-Effect: Z275 coating (275 g/m²) prevents pitting in acidic soils.
Comparative Analysis
| Material | Yield Strength (MPa) | Corrosion Resistance | Key Applications |
|---|---|---|---|
| DX51D HDG | 220–320 | High (humidity) | Food processing, HVAC |
| Galvanized Aluminum | 150–200 | Moderate | Aerospace interiors |
| Carbon Steel A53 | 240 | Low | Water supply lines |
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Certifications: EN, ASTM, JIS. Global shipping available.
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