TOBO Industrial (Shanghai) Co., Ltd., a premier manufacturer and global supplier of precision-engineered metal products, has announced the expansion of its advanced piping portfolio with the introduction of ASTM B467 Alloy Steel CuNi 90/10 Seamless Pipe in Schedule 40s. This premium copper-nickel piping solution delivers exceptional corrosion resistance, superior mechanical properties, and long-term reliability for critical marine, offshore, and industrial processing applications worldwide.
The ASTM B467 Standard: The Quality Benchmark for Welded CuNi Pipe
The ASTM B467 / ASME SB467 standard is the globally recognized specification for welded copper-nickel alloy pipe . This standard establishes requirements for welded copper-nickel alloy pipes produced from Copper Alloy UNS Nos. C70600 and C71500 for general engineering applications . It governs chemical composition, mechanical properties, dimensional tolerances, and testing requirements, ensuring:
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Chemical Composition Control: Strict verification of the precise alloy ratios essential for optimal corrosion resistance and mechanical performance
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Mechanical Property Validation: Confirmation of minimum tensile strength, yield strength, and elongation requirements per applicable tempers
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Dimensional Accuracy: Tight tolerances on outside diameter, wall thickness, and length for perfect fit in system assemblies
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Pressure Integrity: Compliance with hydrostatic or non-destructive testing requirements
Material Excellence: C70600 (90/10 Copper-Nickel)
The C70600 alloy, commonly known as 90/10 copper-nickel, is the most widely used wrought copper alloy for marine engineering applications. Comprising approximately 90% copper and 10% nickel with carefully controlled additions of iron and manganese (1.0-1.8% Fe, ≤1.0% Mn) , this alloy delivers outstanding performance in a variety of demanding environments:
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Excellent Seawater Corrosion Resistance: C70600 exhibits extremely low general corrosion rates in seawater, typically below 0.025 mm per year, significantly outperforming standard stainless steels and many other copper alloys in chloride-rich environments. This alloy is virtually immune to stress-corrosion cracking and hot spot denickelification .
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Natural Biofouling Resistance: The alloy's surface chemistry inherently inhibits the adhesion and growth of marine organisms such as barnacles, mussels, and biofilm, reducing maintenance requirements by up to 60% compared to alternative materials. In clean seawater, velocities of up to 2.2-2.5 m/s are accepted .
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Good Mechanical Properties: With minimum tensile strength of 275-370 MPa depending on temper (annealed O61: 260 MPa min; light drawn H55: 310 MPa min) and elongation of 30-45%, C70600 maintains excellent formability and durability across a wide temperature range .
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Thermal Conductivity: Approximately 40 W/m·K makes C70600 ideal for heat exchanger and condenser applications where efficient heat transfer is essential.
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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.
Schedule 40s: The Standard for Pressure Applications
The Schedule 40s (SCH40s) wall thickness designation provides a specific, robust wall thickness engineered for substantial pressure containment in main service lines. The Sch40s schedule is optimized for seawater cooling systems, firewater systems, and process piping where pressure integrity is critical .
Available Configurations and Technical Specifications
TOBO's ASTM B467 Alloy Steel CuNi 90/10 Seamless Pipes are available in a comprehensive range:
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Diameter Range: 1/2 inch to 24 inches (DN15 to DN600), covering the full spectrum of industrial piping needs
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Wall Thickness: Schedule 40s, with additional schedule options available upon request
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Lengths: Standard random lengths of 18-24 feet, with cut-to-size options available
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Temper Options: Annealed (O61) for maximum formability, light drawn (H55) for enhanced strength, or hard drawn (H80) for maximum strength
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End Finish: Plain end, beveled end, or custom configurations as specified
Industry Applications Across Critical Sectors
The combination of ASTM B467 standard, C70600 alloy, and Sch40s wall thickness makes these pipes ideal for mission-critical applications across multiple industries:
Marine and Shipbuilding:
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Seawater cooling systems for main engines and auxiliary equipment
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Ballast water management systems and fire-fighting pipelines
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Heat exchanger and condenser tube bundles
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Offshore platform piping and subsea equipment
Desalination and Water Treatment:
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Multi-stage flash (MSF) evaporator tube bundles
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Reverse osmosis (RO) plant high-pressure piping
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Brine heater and heat recovery sections
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Intake and discharge lines handling high-salinity seawater
Power Generation:
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Steam condenser tubing in coastal and nuclear power plants
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Feedwater heaters and heat exchangers
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Cooling water systems for thermal power stations
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Auxiliary cooling circuits
Chemical and Process Industries:
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Heat exchanger and condenser tubes for corrosive media
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Process piping in chemical plants handling aggressive fluids
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Pollution control systems and industrial water treatment
Offshore Oil and Gas:
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Seawater injection lines for reservoir pressure maintenance
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Topside and subsea cooling water systems on platforms and FPSO vessels
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Firewater systems on platforms and FPSO vessels
Economic Advantages and Lifecycle Value
The selection of CuNi 90/10 C70600 pipes delivers compelling economic benefits:
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Extended Service Life: 30-50 year service life in seawater applications eliminates frequent replacement cycles
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Reduced Maintenance: Natural corrosion and biofouling resistance minimize cleaning requirements, chemical treatments, and inspection frequency
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Operational Reliability: Prevention of corrosion-related failures avoids costly unplanned downtime, particularly critical in offshore and remote installations
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Lower Total Cost of Ownership: Despite premium initial investment, the combination of longevity and reduced maintenance delivers superior long-term value
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, nickel alloys, stainless steels, and associated products for demanding applications, with strict quality control and complete traceability .