Recently, our company has successfully completed the manufacturing and delivery of UNS S32750 super duplex stainless steel pipes customized for subsea umbilical cable applications. The consignment totals 2,100 meters in length with a rated design pressure of 7,500 psi, with all technical parameters surpassing customer specifications and industrial benchmarks. As the company’s first officially delivered deep-sea umbilical pipe project, this successful handover represents a key technological and market breakthrough in the R&D and manufacturing of critical materials for deep-sea oil and gas exploration and high-end marine engineering.
Serving as pivotal infrastructure for deep-sea hydrocarbon development, subsea umbilical cables are regarded as the “deep-sea lifeline” that connects subsea production systems with offshore surface platforms, responsible for power supply, signal transmission and fluid medium delivery. The matching tubular products are required to withstand extreme subsea operating environments characterized by ultra-high pressure, high salinity and severe corrosion. With rigorous process standards and high technical thresholds, umbilical pipe manufacturing has long been a core strategic research area for high-end marine engineering materials.
Against the dual challenges of stringent technical requirements and a tight delivery schedule, all departments of the company collaborated efficiently to advance the project. Commencing with billet extrusion on April 27, 2026, the full workflow from production, professional testing to final shipment was accomplished in merely 40 days. This rapid and high-quality delivery fully validates our robust rapid response capability and sophisticated precision manufacturing strength for high-grade special metal materials.
The products are manufactured via the state-of-the-art “hot extrusion + precision cold rolling” integrated process, which optimizes the internal metallographic structure and substantially enhances overall mechanical and anti-corrosion performance. All finished pipes undergo precision butt welding and rigorous non-destructive testing, including PT (Liquid Penetrant Testing) and DR (Digital Radiographic Testing). The finished products feature uniform microstructure, superior mechanical properties and excellent corrosion resistance, fully complying with long-term safety operation standards for extreme deep-sea service conditions.
Backed by premium core production equipment including the Italian DANIELI 25MN hot extrusion press and fully automatic precision cold rolling mill, as well as an in-house CNAS-accredited testing laboratory, our company has established a full-process digital quality management system. The whole production and inspection procedures achieve comprehensive traceability and standardized control, ensuring consistent and reliable quality output of high-end special tubular products.
As a specialized manufacturing base focusing on high-end small-diameter precision seamless pipes, the company features an annual production capacity of 12,000 tons. Our product portfolio covers marine engineering, deep-sea oil and gas exploitation, petrochemical heat exchangers, semiconductor equipment and high-end energy facilities. We have earned widespread recognition and trust from global clients through reliable product quality and mature manufacturing technologies.
This successful delivery of super duplex stainless steel umbilical pipes marks a new milestone for the company in the field of high-end marine engineering critical materials, following the successful commercialization of nickel-based alloy tubing and stainless steel high-pressure boiler tubes. It further optimizes our high-end marine pipe product system and fills the gap in core supporting materials for deep-sea oil and gas development. Moving forward, we will continue to focus on the R&D and industrial manufacturing of high-end special pipes, sustain technological innovation and upgrading, and contribute to the advancement of deep-sea resource exploitation and the localization of high-end marine engineering equipment.
