JIS G3444 DN15-DN600 Welded Pipe for Mechanical Tubing and Structural
Product Introduction
Welded steel pipes are manufactured by rolling steel coils/sheets and welding the seam longitudinally. Our welded pipes offer high dimensional accuracy, excellent strength-to-weight ratio, and cost-effectiveness compared to seamless alternatives.
Key Features:
Normal sizes
Manufacturing Process
Welded Steel Pipe Standards And Grades
Applications & Advantages
Typical Applications: Oil & gas transmission, Water/wastewater systems, Structural scaffolding, Mechanical/automotive parts, HVAC systems, Fire protection piping
Competitive Advantages:
Cost-Effective: 20-30% cheaper than seamless pipes
Precision: ±0.5mm diameter tolerance
Versatility: Wide size/thickness range
Quick Delivery: Large inventory of standard sizes
Customizable: Special coatings/lengths available
6.Packaging & Shipping
Standard Packaging: Bare Pipes: Bundle strapped with steel bands (1-2 tons/bundle), Galvanized Pipes: Plastic caps + woven fabric wrapping, Threaded Ends: Protective sleeves
Shipping Options:
20'/40' containers (max 28 tons), Bulk vessel (min 100 tons), Truck load
Export Documentation:
Mill Test Certificate, Original Certificate of Origin
Packaging and Shipping
To safely transport welded steel pipes, standard export packing methods are used. These methods protect the pipes from damage during transit. Available transportation options include containerized sea freight for long-distance international shipments, bulk sea freight for large-volume orders, air freight for urgent deliveries, land transportation for domestic or nearby destinations, and multimodal transportation, which combines various transport modes for optimal efficiency.
Q&A
Q: Are you a ERW vs LSAW - which to choose?
A: ERW for ≤24" low-pressure applications; LSAW for >24" high-pressure systems.
Q: Maximum working pressure?
A: Calculated per ASME B31.3 formula. Example: 6" SCH40 ERW = 150 PSI @ 100°C.
Q:How to identify pipe grade?
A: Check stenciled markings - e.g., "API 5L X52 PSL2" indicates X52 grade.
Q: Acceptable weld defect limits?
A: Per API 1104 - max 3.2mm undercut, 10% wall thickness lack of fusion.
Q: Shelf life of galvanized pipes?
A:12 months outdoor storage; indefinite indoors with proper ventilation.
Q: MOQ for custom sizes?
A6: 20 tons for special diameters; 50 tons for proprietary alloys.