Galvanized Steel pipe

Galvanized Steel Pipes: Premium Metal Solutions for Global Markets

1. Raw Material Composition

Our galvanized steel pipes start with top-tier raw materials to ensure structural integrity and long-term performance:

• Base Steel: High-quality low-carbon steel grades, including S235JR(EN 10025), S355JR(EN 10025), Q235B(GB/T 700), and A36(ASTM A36). These grades offer excellent weldability, tensile strength(≥375 MPa), and yield strength(≥235 MPa), making them suitable for heavy-duty and low-pressure applications.
• Zinc Coating: 99.95% pure zinc, compliant with ASTM B633 standards. The hot-dip galvanizing process applies a minimum zinc thickness of 85μm, with optional 100-120μm coatings for extreme corrosion environments (e.g., coastal areas, chemical plants).
• Auxiliary Materials: Phosphating agents and cleaning solvents (free of heavy metals) for pre-galvanizing surface treatment, ensuring strong adhesion between the steel base and zinc coating.

2. Manufacturing Process

Our state-of-the-art production line follows a rigorous 7-step process to guarantee consistent quality:

1. Steel Coil Inspection & Cutting: Premium steel coils undergo ultrasonic testing to detect internal defects. They are then cut into strips of precise width and length based on the target pipe size.
2. Cold Roll-Forming: Steel strips are shaped into seamless pipe profiles using advanced roll-forming machines, with real-time dimensional monitoring to maintain OD/ID accuracy (tolerance: ±0.5 mm).
3. High-Frequency Induction Welding: The formed steel profiles are welded using high-frequency induction technology, creating uniform, high-strength joints without material degradation. Post-welding annealing eliminates residual stress.
4. Degreasing & Pickling: Pipes are immersed in alkaline degreasing solutions (50-60°C) to remove oil and dirt, followed by pickling in dilute hydrochloric acid (15-20%) to eliminate rust and oxide layers.
5. Hot-Dip Galvanizing: Cleaned pipes are dipped into a molten zinc bath (445-455°C) for 3-5 minutes, forming a metallurgically bonded zinc-iron alloy layer (n,7,8 phases) that provides superior corrosion resistance.
6. Quality Inspection: 100% visual inspection (for coating uniformity and surface defects) is complemented by dimensional testing (OD, ID, wall thickness) and adhesion testing (≥30 N/mm²). Optional ultrasonic testing is available for critical applications.
7. Finishing & Customization: Pipes are cut to standard lengths (6m/12m) or custom lengths (up to 18m). End treatments include plain ends, threaded ends (NPT/BSP/BSPT, Class 2B accuracy), beveled ends (30°/45° for welding), or grooved ends.

3. Specifications & Models

Our galvanized steel pipes cover a wide range of specifications to meet global project needs:

3.1 Nominal Pipe Size (NPS) & Outside Diameter (OD)

3.2 Wall Thickness (Schedule, SCH)

3.3 Length Options

• Standard: 6m (20ft), 12m (40ft)
• Optional: 3m, 4m, 5m, 9m
• Custom: Up to 18m (tolerance: ±50mm)

4. Global Standards Compliance

Our galvanized steel pipes adhere to major international and regional standards, ensuring compatibility with global projects.

5. Certifications

We hold globally recognized certifications to validate our product quality and manufacturing excellence:

• ISO 9001:2015 (Quality Management System)
• ISO 14001:2015 (Environmental Management System)
• OHSAS 18001 (Occupational Health & Safety Management)
• CE Marking (for European Union markets)
• FPC (Fire Protection Certification) - for fire sprinkler systems
• Lloyd's Register Certification - for marine and offshore applications
• SASO/ESMA Certifications - for Middle East markets
• TISI Certification - for Southeast Asia (Thailand) markets

6. Applications

Our galvanized steel pipes are trusted in diverse industries worldwide:

• Water supply and distribution systems
• Sewerage, drainage, and wastewater treatment
• Structural scaffolding and construction frameworks
• Agricultural irrigation and livestock watering
• Fencing, security barriers, and outdoor infrastructure
• Oil, gas, and chemical transportation (low-pressure)
• Fire protection systems and sprinkler networks

Galvanized Steel Pipe Specifications & Parameters Table

Table 1: General Specification Parameters (Global Common Standards)

Table 2: Country-Specific Specification Parameters (Global Standards)