Shanghai, China – July 23, 2025 – TOBO Industrial (Shanghai) Co., Ltd., a recognized manufacturer and exporter of industrial piping components, has unveiled its latest offering: the factory-customized C71500 (70/30) Copper-Nickel Raised Face Weld Neck Flanges, paired with A105 carbon steel hubs, specifically designed for high-performance marine and industrial piping systems.
This new range of flanges is engineered to meet the increasing demand for corrosion-resistant, pressure-enduring pipe connection solutions in aggressive environments such as seawater desalination plants, offshore oil rigs, chemical processing facilities, and shipbuilding yards.
What Sets the C71500 CuNi Flanges Apart?
The C71500 (70/30) alloy, composed of approximately 70% copper and 30% nickel, is well-known for its outstanding corrosion resistance, especially in saline and brine water. With added strengthening elements like iron and manganese, the alloy provides enhanced mechanical performance without sacrificing corrosion protection.
TOBO’s design combines this highly durable alloy with A105 carbon steel hubs, offering a cost-effective yet robust structure for raised face weld neck flanges. The raised face (RF) design improves sealing performance, making these flanges ideal for high-pressure applications.
“We are proud to offer a product that not only meets ASTM and ASME standards but is also customizable according to specific client requirements,” said a spokesperson for TOBO Industrial. “Our C71500 flanges are especially popular in the Middle East and Southeast Asian markets, where seawater cooling systems and marine construction projects are rapidly growing.”
Key Features and Specifications
Material Composition: CuNi C71500 flange face, A105 carbon steel neck
Standard Compliance: ASTM B171 for the CuNi material, ASME B16.5/B16.47 for flange dimensions
Pressure Rating: Class 150 to Class 600 available
Size Range: 1/2” to 24” nominal diameter
Connection Type: Weld Neck with Raised Face sealing surface
Customization Options: Coating, machining tolerance, stamping, heat number traceability, etc.
Certifications: ISO 9001, EN 10204 3.1, DNV, and ABS upon request
Application Versatility
The dual-material construction allows this flange to serve in mixed-metal systems where copper-nickel piping is joined to carbon steel systems. This is a major advantage for clients who operate hybrid infrastructure.
Some of the most prominent use cases include:
Seawater Cooling Systems: Copper-nickel’s inherent biofouling resistance makes it ideal for circulating seawater in power plants.
Shipbuilding: For piping in engine rooms, ballast water systems, and condensers.
Desalination Plants: Corrosion resistance ensures longer life cycles and reduced maintenance costs.
Offshore Oil & Gas: Withstands high pressures, temperatures, and aggressive media like H2S.
Chemical Processing: Copper-nickel’s excellent resistance to sulfuric, hydrochloric, and acetic acids supports chemical conveyance.
Manufacturing Excellence and Global Reach
TOBO operates a modern manufacturing facility in Shanghai, equipped with CNC machining centers, robotic welding stations, and precision testing equipment. All flanges undergo 100% pressure and leakage testing before shipping.
What truly sets TOBO apart is its strong customization capability. Whether the requirement is for non-standard dimensions, special coatings like PTFE, or marking for OEM branding, the factory is equipped to deliver quickly and precisely. Custom orders are often fulfilled within 15-20 working days, with global air and sea freight logistics partnerships in place.
With clients in over 50 countries, TOBO has built a reputation for on-time delivery, responsive communication, and transparent documentation, critical factors for overseas procurement teams.
Market Outlook
The global market for copper-nickel flanges is projected to grow significantly in the next five years, driven by heightened infrastructure spending in maritime and energy sectors. The demand for materials that can endure saline environments while maintaining long-term integrity continues to rise.
TOBO’s offering of customized C71500 CuNi flanges is well-positioned to meet this trend. With a focus on technical excellence, certified materials, and flexible order quantities, the company aims to become a preferred supplier for EPC contractors, shipyards, and industrial procurement departments worldwide.
Client Testimonials
“We sourced a batch of 8” C71500/A105 RF WN flanges from TOBO for our Saudi desalination project,” said a client from Dubai. “The quality exceeded our expectations. Their team worked closely with us to meet specific wall thickness and marking requirements.”
Another Japanese buyer added, “We had special corrosion-proof testing and third-party inspection needs. TOBO provided all documentation on time. They’re very professional.”
Conclusion
In today’s competitive industrial components market, the combination of high-performance materials, cost-effective hybrid design, and factory-level customization gives TOBO’s C71500 (70/30) Raised Face Weld Neck Flange a significant edge.
As industries look to extend equipment life, reduce downtime, and ensure safety in challenging environments, reliable components like TOBO’s copper-nickel flanges will continue to gain market share. For buyers in the marine, offshore, and energy sectors, this product offers both peace of mind and a strong return on investment.
For inquiries, technical datasheets, or RFQs, visit www.tobo-group.com or contact TOBO Industrial’s export department.