BENKOO METAL's welded stainless steel pipes are precision-engineered to deliver unwavering performance in the most demanding industrial environments. Specifically designed for sectors where corrosion or mechanical stress poses a significant operational risk, our welded manufacturing process ensures exceptional consistency and cost-efficiency, particularly for large-diameter requirements in major infrastructure projects.
By integrating advanced metallurgy with rigorous international standards, we provide high-reliability piping solutions for power generation, petrochemical plants, and offshore marine applications. From high-pressure RO membranes to sour water stripper lines, our products are optimized to maximize plant uptime and ensure structural integrity under extreme chemical and physical loads.
Detailed Parameters
| Outside Diameter (OD) | 3" NB to 40" NB (Standard); Up to 60" NB (Custom) | Wall Thickness | Schedules: 5S, 10S, 20S, 40S, 80S, 120S, 160S |
|---|---|---|---|
| Standard Length | Up to 12 meters (Custom random or exact lengths available) | Welding Processes | SAW (Submerged Arc), TIG, and Plasma Welding |
| Finishing Options | Solution Annealed, Pickled & Passivated (APP), Electro-polishing | Common Material Grades | 304/304L, 316/316L, 317L, 321, 347, 904L |
| US Standards | ASTM A312, ASTM A358, ASTM A409 | EU Standards | EN 10217-7 (Welded Steel Tubes for Pressure Purposes) |
| Japanese Standards | JIS G3459 (Ordinary), JIS G3468 (Large Diameter) | Dimensional Basis | ASME B36.19M Dimensions |
Key Advantages
Superior Corrosion Resistance
Optimized Mo-alloyed grades like 316L and 317L prevent pitting and crevice corrosion in chloride-rich marine environments.
Extended Lifecycle
Ti-stabilized (321) and Nb-stabilized (347) grades prevent sensitization during welding, ensuring long-term durability.
Economic Scalability
The welded process provides significant cost advantages for large-diameter pipes without compromising structural integrity.
High-Temperature Stability
Engineered for power plant exhaust sections and overhead condensers with excellent intergranular corrosion resistance.
Surface Precision
Superior internal surface finishes maximize flow efficiency and reduce biofouling in desalination and water systems.
Full Traceability
Every pipe comes with EN 10204 3.1/3.2 Mill Test Certificates for absolute material verification.
Product Gallery
Management Platforms
Material Selection
Expert engineering support to select the optimal grade (304L to 904L) based on specific corrodents.
Quality Control
Rigorous Hydrostatic, RT, and UT Non-Destructive Testing to ensure zero-leak performance.
Standard Compliance
Strict adherence to ASTM, ASME, EN, and JIS global standards for seamless project integration.
Custom Engineering
Capability to produce extended diameters up to 60" NB and custom wall thicknesses.
Inventory Management
Extensive inventory of pipes and bars to ensure rapid delivery and reduced project lead times.
Global Logistics
Reliable supply chain management delivering certified materials to worldwide job sites on schedule.
Investment Return Comparison
| Performance Metric | Standard Welded Pipes | BENKOO Premium Welded Pipes |
|---|---|---|
| Corrosion Lifespan | Standard Grade | Optimized Alloy Selection (316L/317L) |
| Installation Cost | High Site-Welding | Optimized Custom Lengths |
| Failure Risk | Moderate (General) | Low (Strict NDT/RT Testing) |
| Material Waste | Standard Cut | Precision Custom Fabrication |
| Maintenance Interval | Frequent Inspection | Extended via APP Finishing |
Frequently Asked Questions
Welded pipes offer exceptional consistency in wall thickness and significant economic advantages for large diameters (typically over 18"), making them more cost-effective for major industrial projects while maintaining high structural integrity.
We utilize advanced welding techniques such as Submerged Arc Welding (SAW) for large diameters and TIG/Plasma for high purity. Quality is verified through Non-Destructive Testing (RT or UT) and Hydrostatic testing.
For marine and seawater environments, 316/316L is the standard due to the addition of Molybdenum, which provides essential resistance to chloride-induced pitting and crevice corrosion.
Grades 321 (Ti-stabilized) and 347 (Nb-stabilized) are used in high-temperature piping to prevent sensitization during welding, ensuring the pipes remain resistant to intergranular corrosion.
Yes, our pipes are designed to meet ASME B31.3 and B31.1 pressure ratings, following ASTM A312, A358, and EN 10217-7 standards to ensure safety in pressure-critical applications.
APP stands for Annealed, Pickled, and Passivated. This process removes weld scale and restores the protective chromium oxide layer on the steel surface, which is critical for maintaining maximum corrosion resistance.
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