TOBO Industrial (Shanghai) Co., Ltd., a leading manufacturer and global supplier of precision-engineered metal products, has announced a significant expansion of its advanced piping portfolio. The company now offers a comprehensive range of ASME-compliant 70/30 (C71500) and 90/10 (C70600) Copper-Nickel (CuNi) tubes alongside high-quality stainless steel welded pipes. This dual-material solution addresses the most demanding requirements of marine, offshore, energy, and chemical processing industries where corrosion resistance, thermal stability, and long-term reliability are mission-critical.
The ASME Standard: The Quality Benchmark for Piping Products
Compliance with ASME (American Society of Mechanical Engineers) standards is the cornerstone of this product expansion. ASME specifications—including ASME SB111 for seamless copper alloy tubes and ASME SA312 for stainless steel pipes—ensure:
Rigorous Material Control: Strict verification of chemical composition and mechanical properties
Dimensional Precision: Tight tolerances on outside diameter, wall thickness, and length for perfect system integration
Pressure Integrity: Adherence to hydrostatic and non-destructive testing requirements
Global Acceptance: ASME-compliant components are recognized and trusted by engineers and regulatory bodies worldwide
Material Excellence: C70600 and C71500 Copper-Nickel Alloys
C70600 (90/10 Copper-Nickel) – The Versatile Workhorse:
This alloy, comprising approximately 90% copper and 10% nickel with 1.0-1.8% iron, is the most widely used wrought copper alloy for marine engineering applications.
Outstanding Seawater Corrosion Resistance: Exhibits extremely low general corrosion rates, typically below 0.025 mm per year, significantly outperforming standard stainless steels in chloride-rich environments
Natural Biofouling Resistance: The alloy's surface chemistry inherently inhibits marine growth, reducing maintenance requirements by 30-40% compared to alternative materials
Good Mechanical Properties: Minimum tensile strength of 275-370 MPa with elongation of 30-45%
Thermal Conductivity: Approximately 40 W/m·K, ideal for heat exchangers and condensers
Applications: Seawater cooling systems, desalination plants, marine piping, and power plant condensers
C71500 (70/30 Copper-Nickel) – The Premium Grade:
The 70/30 alloy contains 29-33% nickel with 0.4-1.0% iron, delivering enhanced properties for the most demanding service conditions.
Superior Corrosion Resistance: 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, significantly stronger than the 90/10 grade
High-Temperature Stability: Maintains mechanical properties in continuous service up to 400°C
Superior Fatigue Resistance: Excellent resistance to cyclic loading and thermal fatigue
Applications: Offshore oil and gas platforms, naval vessels, chemical processing equipment, and critical heat exchangers
Stainless Steel Welded Pipes: Complementing the Alloy Range
In addition to copper-nickel tubes, TOBO's offering includes high-quality stainless steel welded pipes in 304/304L and 316/316L grades.
Manufacturing Excellence: Automated orbital welding with controlled heat input, continuous roll forming with tight dimensional control, and controlled atmosphere annealing to optimize microstructure and corrosion resistance
Quality Verification: 100% non-destructive testing including eddy current, radiographic, or ultrasonic examination; hydrostatic pressure testing; and full traceability documentation
Advantages: Stainless steel welded pipes offer high strength, good corrosion resistance, cost-effectiveness for large-diameter applications, and wide availability in standard sizes and schedules
Technical Specifications and Compliance
TOBO's ASME-compliant piping products meet or exceed rigorous international standards:
Specification Description
Copper-Nickel Tubes ASTM B466 / ASME SB466, ASTM B111 / ASME SB111
Stainless Steel Pipes ASTM A312 / ASME SA312
Offshore Applications EEMUA 144/234, DIN 86019
Sour Service NACE MR0175 / ISO 15156
European Market PED 2014/68/EU
Available Configurations:
Diameter Range: 1/4 inch to 24 inches (DN6 to DN600)
Wall Thickness: Schedule 5S through XXS
Temper Options: Annealed (O60), light drawn (H55), hard drawn (H80)
Lengths: Standard random lengths of 18-24 feet, with cut-to-size options
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
Ballast water management 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 ASME 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
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
Conclusion: 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, all manufactured to rigorous ASME standards, 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.