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 Copper Pipes, Copper Tubes, and Copper-Nickel Seamless Pipes in both CuNi 90/10 (C70600) and CuNi 70/30 (C71500) alloys. These high-performance seamless pipes are engineered to meet the most demanding requirements of marine, offshore, power generation, HVAC, and industrial processing applications where corrosion resistance, thermal conductivity, and long-term reliability are paramount.
The Material Advantage: Copper and Copper-Nickel Alloys
Standard Copper Pipes and Tubes:
Copper pipes have been the industry standard for plumbing, HVAC, and refrigeration applications for decades due to their exceptional properties:
Superior Thermal Conductivity: Approximately 401 W/m·K, making copper the material of choice for heat exchangers, condensers, and refrigerant lines
Excellent Corrosion Resistance: Naturally resistant to atmospheric corrosion and many chemical environments
Outstanding Formability: Easily bent, flared, and soldered for efficient installation
Antimicrobial Properties: Naturally inhibits bacterial growth, making it ideal for potable water systems
Proven Longevity: Copper piping systems have demonstrated service lives exceeding 50 years in many applications
C70600 (90/10 Copper-Nickel) – The Versatile Marine 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 the adhesion and growth of marine organisms such as barnacles and mussels, reducing maintenance requirements by up to 60%
Good Mechanical Properties: Minimum tensile strength of 275-370 MPa with elongation of 30-45%
Thermal Conductivity: Approximately 40 W/m·K, suitable for heat exchanger and condenser applications
Applications: Seawater cooling systems, desalination plants, marine piping, and power plant condensers
C71500 (70/30 Copper-Nickel) – The Premium Grade for Maximum Performance:
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
Seamless Construction: The Integrity Advantage
TOBO's copper and copper-nickel pipes are manufactured using advanced seamless extrusion and cold-drawing processes, ensuring maximum structural integrity and dimensional precision. Unlike welded alternatives, seamless construction eliminates potential weak points associated with longitudinal weld seams, resulting in:
Homogeneous Microstructure: Uniform grain structure around the entire circumference provides consistent mechanical strength and corrosion resistance
Superior Pressure Integrity: No weld seam to serve as a potential failure point under cyclic pressure loading, thermal stress, or vibration
Enhanced Fatigue Resistance: Absence of weld defects and associated heat-affected zones results in superior resistance to vibration and pressure cycling
Improved Flow Performance: Smooth internal surface without weld seam irregularities minimizes friction and turbulence, reducing pumping energy requirements
Manufacturing Excellence and Quality Assurance
TOBO's seamless copper and copper-nickel pipes are produced using state-of-the-art manufacturing processes:
Production Process:
Hot Extrusion: Cast billets are extruded at high temperatures to create the initial tubular form with refined grain structure
Cold Drawing: 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
Surface Enhancement: Advanced finishing processes create smooth internal and external surfaces for fluid transport applications
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.
Technical Specifications and Compliance
TOBO's copper and copper-nickel seamless pipes meet or exceed rigorous international standards:
Specification Applicable Standards
Copper Tubes ASTM B88, ASTM B280, EN 1057
Copper-Nickel Tubes ASTM B466 / ASME SB466, ASTM B111 / ASME SB111
Offshore Applications EEMUA 144/234, DIN 86019
Sour Service NACE MR0175 / ISO 15156
Available Configurations:
Diameter Range: 1/4 inch to 24 inches (DN6 to DN600)
Wall Thickness: Schedule 5S through XXS
Temper Options: Annealed (O60) for maximum formability, light drawn (H55) for enhanced strength, hard drawn (H80)
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
These high-performance seamless pipes serve 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 and fire-fighting pipelines
Offshore platform piping and subsea equipment
Heat exchanger and condenser tube bundles
Power Generation:
Steam condenser tubing in coastal and nuclear power plants
Feedwater heaters and heat exchangers
Cooling water systems for thermal power stations
Auxiliary cooling circuits
HVAC and Refrigeration:
Refrigerant lines for air conditioning systems
Chilled water distribution piping
Heat pump connections and heat exchanger circuits
Condenser and evaporator coils
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
Plumbing and Building Services:
Potable water distribution systems
Hot and cold water supply lines
Fire sprinkler systems
Medical gas piping systems
Economic Advantages and Lifecycle Value
The selection of high-quality copper and copper-nickel pipes delivers compelling economic benefits:
Extended Service Life: 30-50 year service life for copper-nickel alloys in seawater applications; 50+ years for copper in plumbing applications
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
Recyclability: Copper and copper alloys are 100% recyclable without loss of performance, supporting circular economy principles
Comparative Advantages: CuNi vs. Alternative Materials
Property C70600 (90/10) C71500 (70/30) 316 Stainless Titanium Grade 2
Seawater Corrosion Excellent Excellent Moderate Excellent
Biofouling Resistance Excellent Excellent Poor Excellent
Thermal Conductivity 40 W/m·K 29 W/m·K 16 W/m·K 17 W/m·K
Relative Cost Moderate Premium Moderate Very High
Fabricability Excellent Good Good Poor
Global Supply and Availability
TOBO maintains substantial inventory of seamless copper and copper-nickel pipes, with efficient logistics networks serving international markets. The company offers flexible order quantities, customization options for non-standard dimensions and tempers, and third-party inspection by DNV, ABS, LR, BV, or SGS upon request.
Conclusion: The Trusted Choice for Critical Fluid Transport
The introduction of Copper Pipes, Copper Tubes, and Copper-Nickel Seamless Pipes in CuNi 90/10 and 70/30 alloys represents TOBO's commitment to providing comprehensive, high-performance solutions for the most demanding fluid transport applications. Whether specified for standard plumbing systems requiring copper tubes, seawater cooling systems demanding the corrosion resistance of C70600, or critical offshore applications requiring the maximum performance of C71500, TOBO delivers the durability, reliability, and quality that engineers and project managers trust worldwide.
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, HVAC, and industrial sectors. The company specializes in copper, copper-nickel alloys, stainless steels, and associated products for demanding applications, with strict quality control and complete traceability.