In a strategic advancement for industries battling the world's most corrosive environments, TOBO Industrial (Shanghai) Co., Ltd. has announced the full-scale production and global availability of its premium Copper-Nickel 70/30 (CuNi 70/30) Forged Flanges. Meticulously engineered to comply with the ASME B16.5 standard, this comprehensive product line is available across an extraordinary pressure spectrum—from Class 150 to the formidable Class 2500—delivering an unparalleled combination of material integrity and certified performance for the most demanding global projects .
The Material at the Core: CuNi 70/30 (UNS C71500)
The cornerstone of this offering is the Copper-Nickel 70/30 alloy (UNS C71500) , a material long revered as the premier choice for seawater and aggressive chemical service. With a composition of approximately 70% copper and 30% nickel, this alloy exhibits exceptional resistance to seawater corrosion, biofouling, stress-corrosion cracking, and erosion from high-velocity fluids . Its performance far surpasses that of standard stainless steels in chloride-rich environments, making it indispensable for offshore oil & gas platforms, seawater cooling systems in LNG terminals, desalination plants, naval shipbuilding, and coastal power generation facilities . The choice of this alloy for flanges—critical connection points in any piping system—ensures longevity and system integrity where failure is not an option.
Forged Construction: The Integrity Advantage
The manufacturing methodology is equally pivotal: forging. Unlike cast or fabricated alternatives, forged flanges are produced by shaping the CuNi 70/30 billet under immense pressure at high temperatures . This process refines the metal's grain structure, eliminates porosity, and significantly enhances its mechanical properties—including tensile strength, impact toughness, and fatigue resistance . For a flange, which must withstand cyclic pressures, thermal stresses, and bolt loading, the homogeneous strength and reliability of a forged component are non-negotiable for safety-critical applications. The alloy's superior mechanical strength makes it suitable for high-pressure and high-temperature systems, with the ability to maintain integrity in continuous service up to 400°C .
The ASME B16.5 Standard: A Passport for Global Interoperability
Adherence to the ASME B16.5 standard provides the universal framework for dimensions, tolerances, materials, testing, and marking. This standard ensures global interoperability, allowing these CuNi 70/30 flanges—whether weld neck, slip-on, socket weld, blind, or lap joint types—to mate perfectly with valves, pumps, and piping from any other ASME-compliant supplier worldwide . It is the lingua franca of industrial piping, enabling seamless integration into international projects.
Unprecedented Pressure Range: Class 150 to 2500
The true engineering feat lies in the offered pressure class range: from Class 150 to Class 2500 . This spectrum covers virtually every conceivable application:
Class 150 & 300: For lower-pressure seawater intake lines, shipboard cooling systems, and auxiliary process lines.
Class 600 & 900: For intermediate-pressure services in chemical processing, offshore production risers, and high-volume seawater pumps.
Class 1500 & 2500: For ultra-high-pressure, critical applications such as subsea oil & gas Christmas trees, seawater injection systems for enhanced oil recovery, and main coolant loops in advanced marine vessels .
Producing a CuNi 70/30 forged flange for Class 2500 requires extraordinary precision. It involves mastering complex heat treatments to optimize the alloy's properties, precision machining to exacting tolerances for sealing faces and bores, and implementing rigorous non-destructive testing (NDT) protocols . Each high-class flange undergoes a battery of tests, including ultrasonic examination for internal flaws, liquid penetrant or magnetic particle inspection for surface defects, and often a final hydrostatic test to verify its pressure-containing capability.
Comprehensive Flange Types and Facing Options
TOBO's comprehensive product line includes a variety of flange types to meet diverse design requirements, including Weld Neck (WN), Slip-On (SO), Blind (BL), Socket Weld (SW), Threaded (TH), and Lap Joint flanges. Facing options include Raised Face (RF), Flat Face (FF), and Ring-Type Joint (RTJ), with sizes typically ranging from 1/2" to 24" nominal pipe sizes, and custom dimensions available upon request .
Quality Assurance and International Certifications
TOBO's manufacturing capability is supported by a full suite of international certifications, including ISO 9001, PED 2014/68/EU, NACE MR0175, and approvals from classification societies like DNV and ABS for marine applications . This certification portfolio assures global customers of a world-class quality management system overseeing every step, from raw material traceability (with certified mill test reports) to final shipment. Quality control measures are implemented at every stage of production, including chemical composition analysis, mechanical testing, dimensional inspection, and non-destructive testing (NDT) to ensure product reliability .
Industry Applications and Market Impact
The demand for CuNi 70/30 forged flanges is prevalent across various industries due to their reliability and superior performance. Key application sectors include marine and shipbuilding (seawater cooling systems, fire suppression), offshore oil and gas (pipeline connections, subsea infrastructure), power generation (cooling water systems), desalination plants (handling highly saline environments), and chemical/petrochemical processing (handling acidic and corrosive fluids) .
Securing reliable, certified CuNi 70/30 flanges for high-pressure, high-corrosion duty has historically been a procurement challenge. TOBO's capability to deliver the full range from Class 150 to 2500 from a single, quality-assured source is transformative, de-risking projects and ensuring material consistency throughout the system . As industries continue to prioritize durability, efficiency, and cost-effectiveness, CuNi 70/30 forged flanges remain a top choice for high-performance piping systems, making them indispensable for critical infrastructure projects 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, 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.