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 the introduction of ASTM B111 6" SCH40 Seamless Copper-Nickel C70600 (90/10 CuNi) Alloy Pipe. This high-performance piping solution is now available with dual ISO and PED (Pressure Equipment Directive) certification, complemented by professional precision cutting and bending services, delivering a complete, ready-to-install solution for critical marine, offshore, and industrial applications worldwide.
The ASTM B111 Standard: The Global Benchmark for CuNi Piping
The ASTM B111 / ASME SB111 standard is the globally recognized specification for seamless copper and copper-alloy condenser tubes and ferrule stock. Compliance with this standard ensures rigorous control over chemical composition, mechanical properties, and dimensional accuracy. The 6-inch Schedule 40 (SCH40) designation provides a specific, robust wall thickness engineered for substantial pressure containment in main service lines, such as seawater cooling mains, firewater systems, and process piping.
The Material Advantage: C70600 (90/10 Copper-Nickel)
The C70600 alloy, commonly known as 90/10 copper-nickel, comprises approximately 90% copper and 10% nickel with controlled additions of iron and manganese. This material delivers a unique combination of properties that make it superior to conventional materials in challenging service conditions:
Superior Seawater Corrosion Resistance: 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 up to 60%
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 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, offering exceptional total cost of ownership
Dual Certification: ISO and PED – A Passport for Global Projects
A key strategic advantage of this product line is its dual certification to both ISO standards and the European Pressure Equipment Directive (PED) :
ISO Certification: Verifies compliance with international quality management and product-specific standards, ensuring consistent manufacturing excellence and complete traceability
PED (2014/68/EU) Certification: This is a mandatory, rigorous conformity assessment for pressure equipment sold within the European Economic Area. Certification involves a Notified Body verifying the pipe's design, manufacture, and final testing. This dual credential provides unparalleled assurance to global EPC firms, guaranteeing the material meets the world's most stringent safety and quality benchmarks
Value-Added Services: Precision Cutting and Induction Bending
Recognizing that material supply alone does not constitute a complete solution, TOBO offers integrated professional cutting and bending services to deliver ready-to-install components:
Precision Cutting Services:
CNC Saw Cutting: High-precision cutting with tolerances as tight as ±0.5mm for exact length specifications
Beveling: End preparation for welding applications per specified angles
Custom Lengths: Pipes cut to exact dimensions from isometric drawings, eliminating on-site cutting waste and reducing skilled labor time
Induction Bending Capabilities:
Computer-Controlled Bending: Precision induction bending that maintains internal diameter and prevents wall collapse
Controlled Parameters: Ensures precise bend angles and radii with minimal wall thinning and ovality, preserving pressure ratings
Elimination of Weld Fittings: Reduces the number of field welds by replacing pre-fabricated elbow fittings with smooth, continuous bends, enhancing flow efficiency and reducing potential leak points
Benefits of Integrated Services:
Reduced On-Site Labor: Pre-processed components eliminate field fabrication time and associated labor costs
Enhanced Quality: Factory-controlled processes ensure consistent quality and dimensional accuracy
Minimized Waste: Precision cutting reduces material waste compared to field fabrication
Single-Point Accountability: Full traceability and responsibility from raw material to finished spool under one supplier
Accelerated Project Schedules: Pre-fabricated spools enable faster "kit-of-parts" installation
Seamless Construction: The Integrity Advantage
The 6" SCH40 pipe is manufactured using advanced seamless extrusion and cold-drawing processes, ensuring maximum structural integrity. Unlike welded alternatives, seamless construction eliminates the longitudinal weld seam, resulting in a homogeneous microstructure. This offers superior resistance to cyclic pressure loading, thermal stress, and vibration—critical factors in dynamic offshore and shipboard systems.
Industry Applications Across Critical Sectors
This high-performance piping solution 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 and fire-fighting pipelines
Offshore platform piping and subsea equipment
Oil and Gas Industry:
Seawater injection lines for reservoir pressure maintenance
Topside and subsea cooling water systems on platforms and FPSO vessels
Process cooling and heat exchanger applications
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
Power Generation:
Steam condenser tubing in coastal and nuclear power plants
Feedwater heaters and heat exchangers
Cooling water systems for thermal power stations
Quality Assurance and International Certifications
TOBO's manufacturing capability is supported by a full suite of international certifications, including ISO 9001, PED, DNV-GL, ABS, and LR for marine applications. Quality control measures implemented at every stage of production include:
Chemical Analysis: Spectrochemical verification of alloy composition per heat lot
Mechanical Testing: Tensile, yield, and hardness verification per applicable standards
Dimensional Verification: Precision measurement ensuring compliance with ASTM specifications
Non-Destructive Testing: Ultrasonic and eddy current testing for tube integrity
Hydrostatic Testing: Verification of pressure integrity per applicable standards
Conclusion: The Global Standard for Critical Piping Systems
The introduction of ASTM B111 6" SCH40 Seamless C70600 Copper-Nickel Pipe with ISO/PED Certification and Cutting & Bending Services represents a significant advancement in industrial piping supply. By combining the proven corrosion resistance of copper-nickel alloy with seamless construction, rigorous dual certification, and value-added fabrication capabilities, TOBO provides engineers, procurement specialists, and project managers with a reliable, single-source solution for the most demanding fluid transport applications.
Whether specified for seawater cooling systems on offshore platforms, high-pressure piping in desalination plants, or critical connections in marine vessels, this integrated piping solution delivers 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 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.