📊 Hot-Dip Galvanized & Pre-Galvanized Steel Pipe Specification Matrix
ASTM A53 / BS 1387 / EN 10255 / ISO 65
Manufactured with continuous high-frequency ERW welding and immersion hot-dip galvanizing, serving water distribution, HVAC fire sprinkler systems, and structural framing globally.
| Specification Parameter | Hot-Dip Galvanized (HDG) Pipes | Pre-Galvanized (GI) Pipes |
|---|---|---|
| Outer Diameter (OD) | 1/2” – 24” (21.3mm – 610mm) | 1/2” – 8” (21.3mm – 219.1mm) |
| Wall Thickness (WT) | SCH 10, SCH 20, SCH 40, SCH 80 (1.8mm – 16.0mm) | 0.6mm – 4.0mm (Lightweight Structural) |
| Zinc Coating Mass | 220g/m² – 550g/m² (30µm – 80µm) | 40g/m² – 120g/m² (Passivated) |
| End Finishes | Threaded & Coupled (BSPT/NPT), Grooved, Beveled, Plain | Plain end, Swaged, Custom hole punched |
| Hydrostatic & NDT Testing | 100% On-line Eddy Current + 5.0 MPa Hydrostatic Test | Weld seam ultrasonic test + Flattening / Bending |
| Standard Export Lengths | 5.8m (20ft container), 6.0m, 11.8m (40ft container) | Customized 3.0m to 12.0m precision cut |
Galvanized Steel Pipe (GI Pipe) Manufacturer in China
Sino East Steel Group produces hot-dip galvanized (HDG) and pre-galvanized round and square steel pipes in Tianjin for fire sprinkler systems, water transmission, greenhouse framing, and scaffolding structures.
Real Production, Warehouse & Seaworthy Export Packaging
Why Procure Direct from Sino East Steel Group
💰 Direct Mill Pricing
Eliminate intermediate trading markups with transparent factory FOB/CIF pricing and flexible payment terms for volume contracts.
🛡️ Certified EN 10204 3.1 MTC
Full heat-number traceability, guaranteed mechanical/chemical tolerances, and complete third-party inspection (SGS/BV) compliance.
🚢 1x20GP Mixed Cargo Support
Consolidate various sizes, specifications, and hardware fasteners into single 25-ton container loads to minimize inventory overhead.
Manufacturing Specifications & Technical Range
| Standard & Grades | ASTM A53 (Gr.A/B), BS 1387 (Class A/B/C), EN 10255, ASTM A795, ISO 65 |
|---|---|
| Size Range | 1/2″ to 12″ (21.3mm to 323.8mm OD) | Square 20×20 to 400x400mm |
| Wall Thickness | 1.2mm – 12.0mm (Light, Medium, Heavy Series) |
| Zinc Coating Weight | Pre-galvanized: 40-120 g/m² | Hot-Dip Galvanized: 200-500 g/m² (30-70µm) |
| End Finishes | Plain End, Beveled End, Threaded with BS/NPT Couplings, Grooved for Victaulic |
| Delivery Time | 15–20 days; 1x20GP mixed sizes container loading support |
Visit our dedicated Steel Supplier for East Africa (Kenya, Tanzania, Uganda) featuring fast 18–22 days direct shipping, KEBS PVoC / TBS CoC compliance, wire rod SAE1008, and 1x20GP mixed container consolidation.
Ready to Procure Direct from Tianjin Steel Manufacturer?
Contact our senior sales engineers with your required size, grade, and destination port. We provide official CIF quotations and MTC samples within 15 minutes.
Inside Our Hot-Dip Galvanizing Line: Certified Pipe Production
Galvanized steel pipe from Sino East Steel is produced on continuous and batch hot-dip galvanizing lines in our Tianjin facility. We control the complete process from ERW welded pipe manufacture to chemical pickling, fluxing, molten zinc immersion at 450°C, and passivation. This integrated route guarantees a tightly bonded zinc-iron alloy layer with uniform coating thickness from 170 g/m² up to 350 g/m² (ISO 1461 / ASTM A53).
Each pipe is tested for weld integrity via in-line eddy current testing and 100% hydrostatic pressure testing before threading, grooving, or plain-end finishing. For water supply, firefighting, and structural frameworks across the Middle East and Africa, we supply full heat traceability and EN 10204 3.1 Mill Test Certificates with every shipment.
Finishing and Processing Capabilities
- End Options - Plain square cut, beveled 30°-35°, threaded and coupled (NPT/BSPT), or roll grooved for rapid site coupling
- Size Range - 1/2 inch to 12 inch nominal bore (21.3 mm to 323.9 mm OD) in standard 6m lengths or custom lengths
- Third-Party Witness - Pre-shipment inspection by SGS, Bureau Veritas or TUV arranged at port
- Packaging - Hexagonal bundled with steel strapping, waterproof wrapping, and end caps