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 a comprehensive range of ASME-compliant 70/30 (C71500) and 90/10 (C70600) Copper-Nickel (Cu-Ni) tubes alongside high-quality stainless steel welded pipes. This strategic product expansion delivers a complete, dual-material solution for the most demanding marine, offshore, energy, and chemical processing applications where corrosion resistance and long-term reliability are paramount .
Material Excellence: Understanding 90/10 and 70/30 Copper-Nickel Alloys
The newly launched piping solutions leverage the exceptional properties of two proven copper-nickel alloys, each optimized for specific service conditions .
C70600 (90/10 Copper-Nickel) – The Versatile Workhorse:
This alloy, comprising approximately 90% copper and 10% nickel with carefully controlled additions of iron and manganese, is the most widely used wrought copper alloy for marine engineering applications . Key characteristics include:
Outstanding Seawater Corrosion Resistance: C70600 exhibits extremely low general corrosion rates in seawater, typically below 0.03 mm per year, significantly outperforming standard 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, mussels, and biofilm, reducing maintenance requirements by 30-40% compared to alternative materials .
Excellent Mechanical Properties: With minimum tensile strength of 275-370 MPa (depending on temper) and elongation of 30-45%, C70600 maintains excellent formability and durability across a wide temperature range.
Thermal Conductivity: Approximately 40 W/m·K at 20°C makes C70600 ideal for heat exchanger and condenser applications where efficient heat transfer is essential .
Proven Longevity: Systems utilizing C70600 components have demonstrated service lives exceeding 30-40 years in marine and industrial environments .
C71500 (70/30 Copper-Nickel) – The Premium Grade for Maximum Performance:
The C71500 alloy contains 29-33% nickel with 0.4-1.0% iron, delivering enhanced properties for the most demanding service conditions :
Superior Corrosion Resistance: C71500 offers the best resistance to aqueous corrosion among commercial copper alloys, with exceptional resistance to stress corrosion cracking, impingement attack, and erosion in high-velocity seawater .
Exceptional Strength: Minimum tensile strength of 380-515 MPa (depending on temper) makes C71500 significantly stronger than the 90/10 grade, enabling thinner walls while maintaining pressure integrity .
High-Temperature Stability: Maintains mechanical properties in continuous service up to 400°C, making it suitable for high-temperature heat exchangers and process piping.
Superior Fatigue Resistance: Excellent resistance to cyclic loading and thermal fatigue, critical for applications subject to pressure fluctuations and temperature cycling.
Stainless Steel Welded Pipes: Complementing the Copper-Nickel Solution
In addition to copper-nickel tubes, TOBO's offering includes high-quality stainless steel welded pipes in 304/304L and 316/316L grades . These pipes are produced using advanced manufacturing techniques:
Manufacturing Excellence:
Automated Orbital Welding: Precision welding with controlled heat input for consistent, high-integrity joints
Continuous Roll Forming: Stainless steel strip formed into tubular shape with tight dimensional control
Controlled Atmosphere Annealing: Heat treatment to optimize microstructure and restore corrosion resistance
100% Non-Destructive Testing: Eddy current, radiographic, or ultrasonic testing to verify weld integrity
Quality Assurance Protocols:
Hydrostatic pressure testing to verify pressure integrity
X-ray examination for weld quality verification
Full traceability documentation and certification
EN 10204 3.1/3.2 certification available upon request
Technical Specifications and Compliance
TOBO's ASME-compliant copper-nickel tubes meet or exceed rigorous international standards :
ASTM B466 / ASME SB466: Standard specification for seamless copper-nickel pipe and tube
ASTM B111 / ASME SB111: Standard for copper and copper-alloy seamless condenser tubes
ASTM B552 / ASME SB552: Standard for copper-nickel tubes for water desalting plants
ASTM A312: Standard specification for seamless and welded stainless steel pipes
ASME B16.5: Dimensional standards for flanges and fittings
NACE MR0175 / ISO 15156: For sour service applications where required
PED 2014/68/EU: Compliance for European pressure equipment markets
Available Configurations:
Diameter Range: 1/4 inch to 24 inches (DN6 to DN600), covering the full spectrum of industrial needs
Wall Thickness: Schedule 5S through XXS, accommodating various pressure and service requirements
Temper Options: Annealed (O60) for maximum formability, light drawn (H55), hard drawn (H80), or hard drawn and end annealed (HE80)
Lengths: Standard random lengths of 18-24 feet, with cut-to-size options available
End Finish: Plain end, beveled end, or custom configurations as specified
Industry Applications Across Critical Sectors
The combination of copper-nickel tubes and stainless steel welded pipes serves essential functions across diverse industries :
Marine and Offshore Engineering:
Seawater cooling systems for main engines and auxiliary equipment on commercial and naval vessels
Ballast water management systems and fire-fighting pipelines
Offshore platform piping and subsea equipment
Heat exchanger and condenser tube bundles
Oil and Gas Industry:
Seawater injection lines for reservoir pressure maintenance
Topside and subsea cooling water systems on platforms and FPSO vessels
LNG processing equipment and refinery cooling circuits
Chemical injection systems and subsea umbilicals
Power Generation:
Steam condenser tubing in coastal and nuclear power plants
Feedwater heaters and heat exchangers
Cooling water systems for thermal power stations
Heat recovery steam generators (HRSG)
Desalination and Water Treatment:
Multi-stage flash (MSF) evaporator tube bundles
Reverse osmosis (RO) plant high-pressure piping
Brine heater and heat recovery sections
Intake and discharge lines handling high-salinity seawater
Chemical and Process Industries:
Heat exchanger and condenser tubes for corrosive media
Process piping in chemical plants handling aggressive fluids
Acid and alkali handling systems
Pollution control systems and industrial water treatment
Manufacturing Excellence and Quality Assurance
TOBO's production facilities employ state-of-the-art manufacturing processes to ensure consistent quality across all product lines:
Copper-Nickel Tube Production:
Seamless Extrusion: Hot extrusion of cast billets creates the initial tubular form with refined grain structure
Cold Drawing and Pilgering: Multiple cold-working passes achieve precise dimensional control and enhanced mechanical properties
Solution Annealing: Controlled heat treatment relieves internal stresses and restores ductility for optimal performance
Quality Assurance Protocols:
Material Certification: Mill Test Reports (MTRs) verifying chemical composition and mechanical properties
Dimensional Verification: Precision measurement ensuring compliance with ASTM specifications
Non-Destructive Testing: Eddy current and ultrasonic testing available for critical applications
Hydrostatic Testing: Verification of pressure integrity per applicable standards
Visual Inspection: 100% inspection for surface finish and defect-free construction
TOBO operates in accordance with ISO 9001:2015 quality management systems, ensuring consistent product quality and complete traceability for regulated industries. Third-party inspection by DNV, ABS, LR, BV, or SGS is available upon request.
Economic Advantages and Lifecycle Value
The selection of ASME-compliant copper-nickel tubes delivers compelling economic benefits :
Extended Service Life: 30-50 year service life in seawater applications eliminates frequent replacement cycles
Reduced Maintenance: Natural corrosion and biofouling resistance minimize cleaning requirements, chemical treatments, and inspection frequency
Operational Reliability: Prevention of corrosion-related failures avoids costly unplanned downtime, particularly critical in offshore and remote installations
Lower Total Cost of Ownership: Despite premium initial investment, the combination of longevity and reduced maintenance delivers superior long-term value
Sustainability and Environmental Responsibility
TOBO's copper-nickel tubes align with global sustainability objectives:
100% Recyclable: At end of service life, the alloy can be reprocessed without loss of quality, supporting circular economy principles
Extended Service Life: Long operational lifespan reduces material consumption and waste generation compared to frequently replaced alternatives
Reduced Chemical Usage: Natural biofouling resistance minimizes need for toxic antifouling coatings and biocidal treatments
Energy-Efficient Manufacturing: Modern production facilities employ optimized processes reducing carbon footprint
RoHS and REACH Compliance: Products meet environmental safety regulations for restricted substances
Global Supply and Availability
TOBO maintains substantial inventory of ASME-compliant copper-nickel tubes and stainless steel welded pipes, with efficient logistics networks serving international markets. Key manufacturing clusters in China, particularly in Jiangsu and Shanghai, have developed advanced metallurgical facilities capable of producing these high-performance tubes with integrated R&D, precision drawing, and non-destructive testing (NDT) capabilities .
Conclusion: Setting the Global Standard for Critical Piping Systems
The introduction of ASME-compliant 70/30 and 90/10 Copper-Nickel Tubes and Stainless Steel Welded Pipes represents TOBO's commitment to providing comprehensive, high-performance solutions for the most demanding fluid transport applications. By combining the proven corrosion resistance of copper-nickel alloys with the versatility and strength of stainless steel, TOBO enables engineers, system designers, and project managers to select the optimal material for their specific environmental conditions and performance requirements.
Whether specified for seawater cooling systems requiring the versatility of C70600, critical offshore applications demanding the maximum performance of C71500, or chemical processing facilities utilizing stainless steel welded pipes, these products deliver 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.