TOBO Industrial (Shanghai) Co., Ltd., a leading manufacturer and global supplier of precision-engineered metal products, has announced the expansion of its advanced piping portfolio with the introduction of seamless C70600 90/10 Copper-Nickel (CuNi) pipes, specifically engineered for high-temperature and high-pressure applications. These premium pipes, manufactured to SCH80 (Schedule 80) wall thickness specifications and supplied in standard 6-meter (6M) lengths, are designed to meet the most demanding requirements of the oil & gas, power generation, marine engineering, and chemical processing sectors worldwide .
The Material of Choice for Extreme Environments
The C70600 alloy, commonly known as 90/10 copper-nickel, is comprised of 90% copper and 10% nickel with controlled additions of iron and manganese . This specific composition provides a unique combination of properties that make it superior to conventional materials in challenging service conditions.
Key Performance Advantages:
Unrivaled Corrosion Resistance: C70600 exhibits outstanding resistance to seawater corrosion, with typical erosion rates below 0.025 mm per year . It also provides exceptional protection against pitting, crevice corrosion, and chloride-induced stress corrosion cracking – common failure modes for standard stainless steels in aggressive 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 in marine systems by up to 60% and preserving hydraulic efficiency over decades of service .
High Thermal Conductivity: With thermal conductivity of approximately 40 W/m·K, these pipes are ideal for heat exchangers, condensers, and cooling systems where efficient heat transfer is critical .
Mechanical Strength and Stability: Seamless C70600 pipes maintain structural integrity across an exceptional temperature range from -100°C to +400°C, with tensile strength up to 358 MPa . The SCH80 wall thickness provides enhanced pressure containment capabilities, making these pipes suitable for high-pressure systems including subsea pipelines and gas injection applications up to 300 bar .
Why Seamless Construction Matters
Unlike welded pipes, which contain a longitudinal weld seam that can become a potential failure point under cyclic pressure and thermal stress, seamless C70600 pipes are manufactured from a solid billet through hot extrusion and cold drawing processes without any welding seams . This seamless construction offers several critical advantages for high-pressure applications:
Superior Pressure Integrity: Eliminates the weakest point in the pipe structure, providing 30% greater burst pressure resistance compared to welded alternatives .
Homogeneous Microstructure: Uniform grain structure around the entire circumference ensures consistent mechanical strength and corrosion resistance .
Enhanced Fatigue Resistance: Absence of weld defects and associated heat-affected zones results in superior resistance to vibration and pressure cycling, essential for dynamic offshore and power generation environments .
Improved Flow Performance: Smooth internal surface without weld seam irregularities minimizes friction and turbulence, reducing pumping energy requirements .
Precision Manufacturing and Quality Assurance
TOBO's C70600 seamless pipes are produced using state-of-the-art manufacturing processes to ensure consistent quality across all product lines :
Production Process:
Hot Extrusion: Cast billets are extruded 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.
100% Non-Destructive Testing: Comprehensive examination including ultrasonic testing, eddy current inspection, and hydrostatic pressure testing to verify product soundness .
Quality Assurance Protocols:
Material Certification: Mill Test Reports (MTRs) verifying chemical composition per ASTM B466/ASME SB466 standards .
Dimensional Verification: Precision measurement ensuring compliance with ASME B36.10/B36.19 specifications for SCH80 wall thickness .
Mechanical Testing: Tensile, yield, elongation, and hardness verification per applicable standards .
Third-Party Inspection: DNV, ABS, LR, BV, SGS inspection available upon request .
Industry Applications Across Critical Sectors
The combination of seamless construction, SCH80 wall thickness, and 6-meter lengths makes these pipes ideal for mission-critical applications across multiple industries :
Oil and Gas Sector:
Subsea pipelines with 50+ year design life requirements
High-pressure gas injection systems (up to 300 bar)
Seawater injection lines for reservoir pressure maintenance
Chemical injection systems and hydraulic control lines
Offshore platform topside and subsea piping
Power Generation:
Steam condenser tubing in coastal and nuclear power plants
Turbine cooling systems requiring resistance to flow-accelerated corrosion
Heat exchangers and feedwater heaters
Auxiliary cooling circuits in thermal power stations
Marine Engineering and Shipbuilding:
Seawater cooling systems for main engines and auxiliary equipment
Ballast water management and fire-fighting pipelines
Desalination plant brine heater and heat recovery sections
Naval vessel systems requiring maximum reliability
Chemical and Petrochemical Processing:
Heat exchanger tubes for corrosive media
Process piping handling acids, alkalis, and aggressive fluids
Pollution control systems and industrial water treatment
Technical Specifications at a Glance
TOBO's seamless C70600 90/10 copper-nickel pipes are available in a complete range of dimensions to suit diverse application requirements:
Parameter Specification
Material Grade C70600 (90/10 Copper-Nickel)
Standard Compliance ASTM B466, ASME SB466, ASTM B111, ASME SB111, EEMUA 144/234, DIN 86019
Wall Thickness SCH80 (Schedule 80) – Extra Heavy
Length Standard 6 meters (custom lengths available)
Diameter Range 1/2" to 12" (DN15 to DN300) and larger upon request
Temper Options Annealed (O60), light drawn (H55), hard drawn (H80)
End Finish Plain end, beveled end, threaded, or flanged
Pressure Rating Up to 300 bar depending on diameter and wall thickness
Service Temperature -100°C to +400°C
Chemical Composition (ASTM B466):
Element Percentage
Nickel (Ni) 9.0 – 11.0%
Iron (Fe) 1.0 – 1.8%
Manganese (Mn) ≤ 1.0%
Carbon (C) ≤ 0.05%
Lead (Pb) ≤ 0.02%
Copper (Cu) Balance
Mechanical Properties (Typical):
Property Value
Tensile Strength (min) 275-358 MPa (40-52 ksi)
Yield Strength (min) 105-170 MPa (15-25 ksi)
Elongation 30-45% in 2 inches
Hardness 60-90 HRB
Modulus of Elasticity 140 GPa
Advantages Over Alternative Materials
When compared to standard materials, C70600 seamless SCH80 pipes deliver compelling performance advantages:
Material Seawater Corrosion Rate Biofouling Resistance High-Temp Limit Relative Cost
C70600 CuNi <0.025 mm/year Excellent 400°C Premium
316L Stainless 0.05-0.10 mm/year Poor 300°C Moderate
Carbon Steel 0.2-0.5 mm/year Poor 200°C Low
Titanium Grade 2 <0.001 mm/year Excellent 300°C Very High
Economic Advantages and Lifecycle Value
While C70600 seamless pipes command a higher initial material cost compared to carbon steel or standard stainless steel alternatives, the Total Cost of Ownership (TCO) analysis presents compelling economic justification:
Extended Service Life: 30-50 year service life in seawater and high-temperature applications eliminates frequent replacement cycles and associated downtime costs .
Reduced Maintenance: Natural corrosion and biofouling resistance minimize cleaning requirements, chemical treatments, and inspection frequency, reducing annual maintenance costs by up to 60% compared to conventional materials .
Operational Reliability: Prevention of corrosion-related failures avoids costly unplanned outages, particularly critical in offshore and remote installations where repair access is limited and downtime costs can exceed $1 million per day .
Energy Efficiency: Maintained flow characteristics and heat transfer efficiency throughout system lifetime reduce pumping and cooling energy requirements, contributing to lower operational expenses .
EEMUA 234 and DIN 86019 Compliance
For demanding offshore and marine projects, TOBO's C70600 pipes can be supplied in accordance with EEMUA Publication 144/234 and DIN 86019, the comprehensive specifications for copper-nickel alloy piping . These standards ensure:
Strict chemical composition controls with optimized iron and manganese content for enhanced erosion resistance in high-velocity seawater
Enhanced corrosion resistance for aggressive offshore environments
Rigorous testing requirements including corrosion testing per ASTM G48 where specified
Full traceability with EN 10204 3.1 or 3.2 certification
Global Supply and Availability
TOBO maintains substantial inventory of ASTM B466/ASME SB466 compliant seamless C70600 SCH80 pipes, with efficient logistics networks serving international markets. Key manufacturing clusters in China, particularly in Shanghai and Jiangsu provinces, have developed advanced metallurgical facilities capable of producing these high-performance tubes with integrated R&D, precision drawing, and non-destructive testing (NDT) capabilities .
Ordering Information:
Minimum Order Quantity: Flexible, with sample orders negotiable
Delivery Time: 15-60 working days depending on quantity and specifications
Payment Terms: T/T, L/C, Western Union
Shipping Terms: FOB Shanghai, CIF, CFR, Ex-Work available
TOBO welcomes inquiries for custom specifications, including non-standard dimensions, special tempers, additional fabrication services (bending, welding, threading), and project-specific certification requirements.
Conclusion: Setting the Global Standard for High-Pressure, High-Temperature Piping
The introduction of seamless C70600 90/10 copper-nickel pipes in SCH80 wall thickness and 6-meter lengths represents a significant advancement in materials technology for demanding industrial applications. By combining the proven corrosion resistance of copper-nickel alloy with seamless construction, heavy-wall SCH80 specifications, and rigorous quality assurance, TOBO provides engineers, system designers, and project managers with reliable solutions for the most challenging high-temperature, high-pressure fluid transport applications.
Whether specified for subsea oil and gas pipelines requiring 50+ year design life, steam condenser tubing in coastal power plants, or high-pressure seawater injection systems in offshore platforms, these pipes deliver the durability, reliability, and performance 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 oil & gas, marine, power generation, 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.