TOBO Industrial (Shanghai) Co., Ltd., a premier manufacturer and global supplier of precision-engineered metal products, has announced the full integration of a complete high-performance piping system comprising ASTM B111 6" SCH40 Seamless Copper-Nickel C70600 (90/10) tubes and perfectly matched 6" SCH40 C70600 flanges. This comprehensive offering delivers a specification-grade solution for the most demanding marine, offshore, and industrial fluid handling applications where corrosion resistance, system integrity, and long-term reliability are paramount .
The Material Standard: ASTM B111 and the 90/10 CuNi Advantage
The core of this system is the ASTM B111 / ASME SB111 standard, the globally recognized specification for seamless copper and copper-alloy condenser tubes and ferrule stock . Compliance with this standard ensures rigorous control over chemical composition, mechanical properties, and dimensional accuracy.
The chosen alloy, Copper-Nickel 90/10 (UNS C70600) , is the most widely used wrought copper alloy for marine engineering . Comprising approximately 90% copper and 10% nickel with controlled additions of iron and manganese, it delivers:
Superior Seawater Corrosion Resistance: Exhibits extremely low general corrosion rates in seawater, typically below 0.025 mm per year, significantly outperforming carbon steel and many stainless steels in chloride-rich environments .
Natural Biofouling Resistance: The alloy's surface chemistry inherently inhibits the adhesion and growth of marine organisms such as barnacles and mussels, reducing maintenance costs and preserving hydraulic efficiency .
Excellent Mechanical Properties: Maintains good strength, ductility, and thermal conductivity (approx. 40 W/m·K), making it ideal for heat exchangers and condensers .
Proven Longevity: Systems utilizing C70600 components have demonstrated service lives exceeding 30-40 years in marine and industrial environments, offering exceptional total cost of ownership despite higher initial material costs .
Seamless Construction: The Integrity Advantage
The 6" SCH40 pipe is manufactured using advanced seamless extrusion and cold-drawing processes, ensuring maximum structural integrity . Unlike welded alternatives, seamless construction eliminates the longitudinal weld seam, resulting in a homogeneous microstructure. This offers superior resistance to cyclic pressure loading, thermal stress, and vibration—critical factors in dynamic offshore and shipboard systems .
Matched Component System: Pipe and Flanges in Perfect Harmony
The true engineering innovation of this launch is the availability of matching 6" SCH40 C70600 flanges, eliminating the need for mixed-material connections or problematic field welding between dissimilar metals. These flanges are manufactured to ASME B16.5 dimensional standards, ensuring global interchangeability, and are available in multiple pressure classes including Class 150, 300, and 600 .
Flange Types Available:
Weld Neck (WN) Flanges: The preferred choice for critical, high-pressure services. The tapered hub provides excellent stress distribution and resistance to fatigue, making it ideal for severe cyclic conditions .
Slip-On (SO) and Socket Weld (SW) Flanges: Suitable for lower-pressure applications, offering easier alignment and installation .
Blind (BL) Flanges: Used to seal the ends of piping systems or provide access for future expansion .
Threaded (TH) Flanges: For connections where welding is not feasible .
Sealing Face Options:
Raised Face (RF): The standard facing for general gasket applications, providing effective sealing for a wide variety of gasket types .
Ring-Type Joint (RTJ): For high-integrity, metal-to-metal sealing in severe service conditions requiring maximum leak prevention .
Technical Specifications
Parameter Specification
Material Copper-Nickel 90/10 (UNS C70600)
Pipe Standard ASTM B111 / ASME SB111
Pipe Size 6" Nominal Diameter (DN150)
Pipe Schedule SCH40 (Wall Thickness: 7.11 mm / 0.280")
Construction Seamless
Flange Standard ASME B16.5
Flange Pressure Classes 150, 300, 600
Flange Types WN, SO, SW, BL, TH
Sealing Faces RF, RTJ
Temper Options Annealed (O61) or light-drawn (H55)
Quality Assurance and International Certifications
TOBO's manufacturing capability is supported by a full suite of international certifications, including ISO 9001, PED, DNV-GL, ABS, and LR for marine applications . This certification portfolio assures global customers of a world-class quality management system overseeing every step, from raw material traceability (with certified mill test reports) to final shipment.
Quality control measures implemented at every stage of production include:
Chemical Analysis: Spectrochemical verification of alloy composition per heat lot
Mechanical Testing: Tensile, yield, and hardness verification per applicable standards
Dimensional Verification: Precision measurement ensuring compliance with ASTM and ASME specifications
Non-Destructive Testing: Ultrasonic and eddy current testing for tube integrity; 100% NDT for critical flanges
Hydrostatic Testing: Verification of pressure integrity per applicable standards
Industry Applications Across Critical Sectors
This integrated piping solution is engineered for the world's most challenging fluid handling environments:
Marine and Shipbuilding:
Seawater cooling systems for main engines and auxiliary equipment on commercial vessels and naval ships
Ballast water management systems and fire-fighting pipelines
Hydraulic and pneumatic control lines
Offshore Oil and Gas:
Seawater injection lines for reservoir pressure maintenance
Topside and subsea cooling water systems on platforms and FPSO vessels
Firewater systems and process piping
Desalination and Water Treatment:
Multi-stage flash (MSF) evaporator tube bundles
Reverse osmosis (RO) plant high-pressure piping
Brine heater and heat recovery sections
Power Generation:
Steam condenser tubing in coastal and nuclear power plants
Feedwater heaters and heat exchangers
Cooling water systems for thermal power stations
Chemical and Process Industries:
Heat exchanger and condenser connections for corrosive media
Process piping in chemical plants handling aggressive fluids
Conclusion: The Global Standard for Critical Piping Systems
The introduction of ASTM B111 6" SCH40 Seamless C70600 Copper-Nickel Pipes with Matching Flanges represents a significant consolidation in industrial piping supply. By offering a complete, certified, matched system of high-performance copper-nickel components, TOBO provides engineers, procurement specialists, and project managers with a reliable, single-source solution for the most demanding fluid transport applications.
Whether specified for seawater cooling systems on offshore platforms, high-pressure piping in desalination plants, or critical connections in marine vessels, this integrated piping system delivers the durability, reliability, and longevity that modern industry demands.
About TOBO Industrial (Shanghai) Co., Ltd.
TOBO is a professional manufacturer and exporter of precision-engineered metal products based in Shanghai, China. With robust production capacity and a commitment to metallurgical excellence, TOBO serves customers worldwide across marine, energy, chemical, and industrial sectors. The company specializes in copper-nickel alloys, stainless steels, duplex steels, nickel alloys, and associated products for demanding applications, with strict quality control and complete traceability .