S32750 1.4410 Duplex Steel Big Size Annealed & Pickled Welded Pipe

S32750 1.4410 Duplex Steel Big Size Annealed & Pickled Welded Pipe

Specifications of 2507 Welded Pipe

What Makes MTSCO Your Trusted Partner?

MTSCO was established in 2006. Through a "factory cluster" model, we have deeply integrated the substantial manufacturing capabilities of our holding subsidiary, HUXIN Pipe. HUXIN Pipe boasts a 35-year history in industrial pipe manufacturing and holds numerous international certifications, including PED and M650. This integration ensures that the large-diameter welded pipes supplied by MTSCO not only benefit from the high production capacity of a major manufacturer but also perfectly balance rigorous engineering requirements with high cost-effectiveness. If you are unsure which material is best suited for your specific operating conditions, let our experts assist you in making the right determination.

Manufacturing Process Flow

These welded pipes are produced using a combination of Roll Bending & Forming (RBE) and CNC bending technologies. Welding is executed via a fully automated PAW+GTAW process, resulting in full, stable, and high-integrity weld seams. Subsequently, the pipe bodies undergo a complete solution annealing treatment and acid pickling-passivation process within a 12-meter annealing furnace. To address the common challenge of deformation in large-diameter pipes, MTSCO has upgraded its traditional forming processes; this enhancement ensures that every large-diameter welded pipe we deliver exhibits exceptional roundness and a uniform metallurgical structure.

Quality Control System

· Secondary Raw Material Inspection: Upon arrival at the facility, MTSCO’s resident team conducts a 100% PMI (Positive Material Identification) re-inspection of all raw materials to eliminate non-conforming materials at the source.

· Full Process Traceability: The entire production process is managed using detailed process cards. Key welding and inspection stages are documented via photographs and archived by dedicated QC personnel, ensuring a manufacturing process that is both transparent and fully traceable.

· 100% Pre-shipment NDT: Prior to leaving the factory, products undergo multiple non-destructive testing (NDT) procedures—including 100% X-ray radiographic inspection of weld seams and hydrostatic testing—to ensure that quality fully meets all engineering standards.

Material Properties of 2507

S32750 (1.4410) is classified as a super duplex stainless steel, featuring a Pitting Resistance Equivalent Number (PREN) greater than 42. This material possesses exceptionally high mechanical strength and demonstrates outstanding resistance to pitting and crevice corrosion in harsh environments characterized by strong acids and high chloride concentrations. To guarantee product performance, all S32750 welded pipes produced by MTSCO are manufactured using premium-grade steel plates sourced from leading domestic mills—such as Baosteel and Tisco—thereby ensuring that the finished pipes exhibit equally top-tier corrosion resistance.

Where Are These 2507 Welded Pipes Used?

These large-diameter super duplex stainless steel welded pipes are primarily utilized in oil and gas extraction, offshore engineering (e.g., FPSO systems), seawater desalination, and the conveyance of high-concentration chemical media. The large-diameter design effectively accommodates high fluid flow rates while significantly reducing system pressure drop. Currently, the large-diameter duplex stainless steel welded pipes supplied by MTSCO have been widely deployed in numerous major offshore engineering and chemical water treatment projects globally, fully meeting the stringent requirements of international engineering applications.

FAQ

Q1: How is the long-term corrosion resistance of the weld seams guaranteed for large-diameter S32750 welded pipes?

A1: Our factory employs an automated PAW (Plasma Arc Welding) + GTAW (Gas Tungsten Arc Welding) process, followed by comprehensive solution annealing and pickling treatments within a 12-meter annealing furnace. Welded pipes produced by MTSCO exhibit an extremely low susceptibility to intergranular corrosion, ensuring that the weld seams possess a corrosion resistance lifespan equivalent to that of the base metal.

Q2: What quality control standards does MTSCO apply regarding the geometric dimensions of large-diameter welded pipes?

A2: HUXIN Pipe has implemented technical upgrades to its forming processes, successfully overcoming the industry-wide challenge of non-roundness in large-sized pipe components. The pipes supplied by MTSCO feature not only extremely tight tolerances for outer diameter and wall thickness but also a pipe-end roundness that far exceeds conventional industrial standards.

Q3: Which major international projects have granted approval and certification for your products?

A3: Our manufacturing facility has obtained high-standard certifications, including ISO, PED, AD2000, and M650. MTSCO’s products have successfully entered the supply chains of renowned international offshore engineering projects, such as FPSO P80 and P83. Our product qualifications fully meet the vendor approval requirements of EPC firms and engineering contractors.

Q4: How do you prevent dents or deformation during sea freight for such large-diameter Super Duplex stainless steel welded pipes?

A4: We possess a highly mature and proven protection protocol for oversized piping. During shipment, rigid internal wooden support frames are installed within the pipe ends, and protective end caps are fitted to safeguard the pipe terminals. MTSCO's QC team monitors the entire packaging process on-site and takes photographs to ensure zero damage during long-distance transport.