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 (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, thermal stability, 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 0.025 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, mussels, and biofilm, reducing maintenance requirements by 30-40% compared to alternative materials .
Excellent Mechanical Properties: With minimum tensile strength of 275-370 MPa 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
The C71500 alloy contains 29-33% nickel and 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 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 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 . These pipes are produced using advanced manufacturing techniques:
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 .
Comprehensive Quality Assurance
TOBO’s ASME-compliant copper-nickel tubes meet or exceed rigorous international standards :
ASTM B466 / ASME SB466: Seamless copper-nickel pipe and tube .
ASTM B111 / ASME SB111: Seamless condenser tubes .
ASTM A312: Seamless and welded stainless steel pipes .
NACE MR0175 / ISO 15156: For sour service applications .
PED 2014/68/EU: Compliance for European pressure equipment markets .
Quality assurance protocols include material certification with Mill Test Reports (MTRs), dimensional verification, non-destructive testing, hydrostatic testing, and 100% visual inspection .
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 and industrial water treatment
Economic and Sustainability Advantages
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 .
100% Recyclability: Copper-nickel alloys are fully recyclable without loss of quality, supporting circular economy principles .
Global Availability and Support
TOBO maintains substantial inventory of ASME-compliant copper-nickel tubes and stainless steel welded 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 .
TOBO operates under strict ISO 9001:2015 certified quality management systems, ensuring consistent product quality and complete traceability for regulated industries .
Conclusion: A Single-Source Solution for Critical Applications
The introduction of ASME 70/30 and 90/10 Copper-Nickel Tubes and Stainless Steel Welded Pipes positions TOBO as a premier single-source supplier for mission-critical piping systems. By combining the proven corrosion resistance of copper-nickel alloys with the strength and versatility of stainless steel, TOBO empowers engineers and project managers to select the optimal material for their specific environmental challenges—whether it be the corrosive forces of seawater, the thermal demands of power generation, or the purity requirements of chemical processing .
About TOBO Industrial (Shanghai) Co., Ltd.
TOBO is a professional manufacturer and exporter of precision-engineered metal products based in Shanghai, China. 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 .