Name: China Welded Galvanized Steel Pipes Manufacturers Suppliers Factory - Shenzhoutong Steel Pipe
Brand: Shenzhoutong
SKU: 303594648

Core Product Basics & Manufacturing Process

Item	Full Details
Official Product Name	Welded Galvanized Steel Pipes (GI Welded Pipes for Short)
Raw Material Grades	Carbon Steel: Q195, Q215, Q235, Q345, A53 Grade A/B, API 5L Grade B, St37, S235JR, SS400
Core Manufacturing Steps	1. Steel coil uncoiling & leveling → 2. High frequency ERW welding forming → 3. Straightening & sizing → 4. Cutting to fixed length → 5. Degreasing & pickling → 6. Hot-dip galvanizing → 7. Cooling & surface finishing → 8. Quality inspection & packaging
Galvanizing Method Options	Hot-dipped galvanized (zinc coating 200-500g/m²), Pre-galvanized (zinc coating 60-150g/m²), Electrolytic galvanized
Shape Types Available	Round Welded Galvanized Pipe, Square Welded Galvanized Pipe, Rectangular Welded Galvanized Pipe

Full Dimension & Specification Ranges

Specification Category	Range Options
Outer Diameter (Round Pipe)	20mm – 508mm (0.75 inch – 20 inch)
Wall Thickness	0.8mm – 20mm
Standard Lengths	5m, 5.8m, 6m, 10m, 12m; Custom lengths available up to 16m
Zinc Coating Weight	Standard: 200-300g/m², Heavy coating: 300-500g/m² per request
Compliance Standards	ASTM A53, ASTM A500, GB/T 3091, EN 10255, BS 1387, JIS G3444, DIN 2440, ISO 65

Performance Index	Test Result
Pressure Rating	1.0MPa – 5.0MPa for low pressure fluid transmission
Corrosion Resistance (Salt Spray Test)	Standard hot-dip galvanized: >720 hours without red rust; Heavy coating: >1200 hours
Bending Performance	No cracking or peeling of zinc layer when bent to 90° (1.5D bending radius)
Hydrostatic Test	100% of products pass 1.5 times working pressure hydrostatic testing before delivery
Weld Strength	Weld tensile strength ≥ 95% of base metal strength, meets all industry standards
Service Life	15 – 30 years in outdoor environment, 30 – 50 years in indoor dry environment; 15 times more durable than uncoated black steel pipes

Product Type	Corrosion Resistance	Cost	Structural Strength	Best Application Scenario
Welded Galvanized Steel Pipes	Excellent	Medium	Good for most projects	General construction, low pressure fluid transmission, outdoor structures
Uncoated Welded Black Pipes	Poor	Low	Similar	Temporary structures, indoor enclosed applications
Seamless Galvanized Steel Pipes	Excellent	High (20%-30% higher cost)	Higher	High pressure fluid transmission, heavy load structural projects
PVC Pipes	Good	Lower	Low	Small diameter low pressure water systems, cannot bear structural load

Treatment Type	Available Options
Pipe End Processing	Plain cut end, Beveled end (for welding), Threaded end with coupling, Grooved end (for clamp connection), Socket end
End Protection	Plastic protective caps for all sizes, Iron end covers for large diameter pipes
Additional Surface Treatment	Oiled after galvanizing (anti-rust for long distance shipping), Black painting, Varnish coating, 3PE/FBE anti-corrosion coating, IPN8710 drinking water anti-corrosion coating
Packaging Methods	Small diameter: Bundled with steel strips + plastic wrapping; Large diameter: Bulk packing; Custom packaging as per buyer's requirement

Industry	Specific Applications
Construction	Building scaffolding, structural support, fire protection pipelines, water supply pipelines, guardrails, door frames, fence posts
Agriculture	Greenhouse frame construction, agricultural irrigation pipelines, farm fencing, poultry house support structures
Oil & Gas Industry	Low pressure oil transmission, well frame pipes, support pipelines for offshore oil platforms, chemical processing plant cooling pipelines
Mining	Mine tunnel support piles, ventilation pipelines, trestle structure pipes
Manufacturing	Mechanical equipment frames, conveyor system supports, automotive structural components, general low pressure fluid conveying
Infrastructure	Municipal drainage pipelines, street lamp poles, sign posts, solar power station support brackets, bridge construction supports

Trade Item	Details
MOQ (Minimum Order Quantity)	2 Metric Tons for standard sizes; 5 Metric Tons for custom sizes
Price Terms	FOB Tianjin/Xingang, CFR, CIF, EXW all acceptable
Payment Terms	30% T/T deposit, 70% balance against B/L copy; Irrevocable L/C at sight accepted
Delivery Time	7 – 15 days for stock sizes; 15 – 30 days for custom production
Loading Port	Tianjin Port, Xingang Port, China
Annual Supply Capacity	500000 Metric Tons per year
HS Code	7306309000

QC Item	Details
Inspection Steps	1. Raw material incoming inspection → 2. Process dimension check → 3. Weld quality ultrasonic inspection → 4. Zinc layer thickness test → 5. Hydrostatic test → 6. Final appearance inspection → 7. Third party inspection accepted (SGS, BV, Intertek)
Available Certifications	CE Certification, EU REACH Certification, RoHS Compliance, ISO 9001 Quality Management System
Defect Rate	< 0.1% for full automatic production lines