TOBO Industrial (Shanghai) Co., Ltd., a premier manufacturer and global supplier of precision-engineered metal products, has announced the expansion of its high-performance fitting portfolio with the introduction of premium 3/8" to 2" UNS C71500 Female Thread Seamless Forged Brass Tees. These high-quality brass pipe fittings are designed for demanding plumbing, marine, chemical processing, and industrial fluid handling applications where superior corrosion resistance, mechanical strength, and leak-proof performance are essential.
The Material: UNS C71500 Copper-Nickel Alloy Excellence
At the heart of these premium brass tees is UNS C71500 (70/30 Copper-Nickel), a high-performance alloy renowned for its exceptional resistance to seawater corrosion, biofouling, and stress-corrosion cracking. Unlike standard brass or bronze fittings, this alloy delivers outstanding performance in the most demanding environments.
Chemical Composition (UNS C71500 / 70/30 Cupronickel):
Copper: 70% (Balance)
Nickel: 29-33%
Iron: 0.40-0.70% – essential for enhanced erosion resistance
Manganese: ≤1.0%
Zinc: ≤1.0%
Lead: ≤0.05%
Performance Properties of UNS C71500:
Superior Corrosion Resistance: The alloy exhibits exceptional resistance to chloride pitting, crevice corrosion, and biofouling, making it ideal for seawater systems and aggressive chemical environments.
High Mechanical Strength: Delivers tensile strength of 372-517 MPa (54,000-75,000 psi) with elongation of 45%, ensuring reliable performance under mechanical stress and pressure cycling.
Excellent Fatigue Resistance: Fatigue strength of 220 MPa at 10⁸ cycles, critical for applications with dynamic loading and vibration.
High-Temperature Stability: Maintains mechanical properties in continuous service up to 400°C, with thermal conductivity of 29 W/m·K at 20°C.
Thermal Expansion Coefficient: 16.2 µm/m·°C (20-300°C), providing compatibility with a wide range of system components.
Forged Construction: The Integrity Advantage
The TOBO brass tees are manufactured using advanced precision forging processes, ensuring maximum structural integrity and dimensional accuracy. The forging process involves shaping the UNS C71500 billet under high pressure at elevated temperatures, which:
Refines Grain Structure: Eliminates porosity and internal voids common in castings, resulting in a homogeneous microstructure with superior mechanical properties.
Enhances Strength and Durability: Forged tees exhibit higher tensile strength, better impact resistance, and greater ductility compared to cast alternatives.
Ensures Consistent Quality: Tight dimensional tolerances ensure perfect fit with standard piping systems and reliable leak-free connections.
No Welding Defects: As seamless components, these tees have no longitudinal weld seams that could serve as potential failure points under cyclic pressure loading.
Seamless Design: Maximum Reliability
The seamless construction of these brass tees eliminates potential weak points associated with welded fittings. Unlike welded alternatives that may have heat-affected zones or weld defects, seamless forged tees provide:
Uniform Wall Thickness: Ensures consistent pressure containment and flow characteristics throughout the fitting.
Superior Fatigue Resistance: Absence of weld seams results in exceptional resistance to vibration and pressure cycling.
Enhanced Corrosion Resistance: No weld seam eliminates a potential site for localized corrosion initiation.
Product Specifications
The TOBO UNS C71500 brass tees are available in a complete range of sizes to suit diverse application requirements:
Specification Details
Size Range 3/8 inch to 2 inches (DN10 to DN50)
Material UNS C71500 (70/30 Copper-Nickel / Cupronickel)
Connection Type Female Threaded (FPT / NPT)
Manufacturing Process Seamless Forged
Pressure Rating Suitable for high-pressure applications
Thread Standard NPT, BSPT, or custom per customer requirements
Temper As-forged with optional annealing
Finish Natural mill finish or as specified
Female Thread Design: Secure, Reliable Connections
The female threaded (FPT) design of these brass tees offers significant advantages for system installation and maintenance:
Standard Thread Compatibility: Designed to connect with male NPT or BSPT threaded pipes and components from any compliant manufacturer.
Leak-Proof Sealing: Precision-machined threads ensure consistent engagement and reliable sealing when used with appropriate thread sealant.
Easy Installation and Maintenance: Threaded connections allow for simple assembly and disassembly without specialized tooling, reducing installation time and maintenance costs.
Versatile Application: Suitable for a wide range of fluids including water, air, natural gas, propane, oil, and fuel.
Tee Configuration: Functional Flow Management
The tee configuration (three-way fitting) serves essential functions in piping systems:
Flow Branching: Enables fluid or gas flow division from a main line to a branch line.
Flow Merging: Allows two separate flows to merge into a single line.
System Distribution: Critical for distributing process fluids, cooling water, compressed air, or chemical solutions.
Instrument Connection: Provides access points for pressure gauges, sensors, and sampling ports.
Why UNS C71500 Over Standard Brass or 316 Stainless Steel?
Property UNS C71500 (70/30 CuNi) Standard Brass (C36000) 316 Stainless Steel
Seawater Corrosion Excellent Poor Moderate
Stress Corrosion Cracking Excellent resistance Moderate resistance Susceptible
Biofouling Resistance Excellent Poor Poor
Cost Moderate Low Moderate-to-High
Non-Magnetic Yes Yes Slightly Magnetic
High-Temperature Performance Excellent (up to 400°C) Good Excellent
Manufacturing Excellence and Quality Assurance
TOBO's manufacturing facility employs state-of-the-art processes to ensure consistent quality:
Precision Forging: High-tonnage forging presses for uniform grain structure and dimensional accuracy.
CNC Machining: Precision computer-controlled machining for exact thread tolerances and surface finishes.
Heat Treatment: Controlled annealing to optimize mechanical properties and corrosion resistance.
Thread Inspection: Go/No-go gauge verification for consistent thread quality.
Quality Control Protocols:
Material Certification: Mill Test Reports (MTRs) documenting chemical composition and mechanical properties per ASTM B151.
Dimensional Verification: Precision measurement ensuring compliance with ASME B16.22 standards.
Pressure Testing: Hydrostatic testing to verify structural integrity.
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.
Industry Applications Across Critical Sectors
These premium UNS C71500 brass tees serve essential functions across diverse industries:
Marine and Offshore Engineering:
Seawater cooling system distribution lines
Ballast water management systems
Shipboard plumbing and hydraulic systems
Offshore platform seawater piping
Chemical and Petrochemical Processing:
Corrosive fluid distribution systems
Chemical injection points
Process sampling connections
Acid and alkali handling facilities
Industrial Plumbing and Water Treatment:
High-pressure water distribution
Industrial process water systems
Desalination plant piping
Cooling water circuits
Oil and Gas Industry:
Instrument air distribution
Hydraulic control lines
Chemical injection systems
Fuel and lubricant distribution
Power Generation:
Cooling water systems
Condenser and heat exchanger connections
Auxiliary service water systems
HVAC and Refrigeration:
Chilled water distribution
Condenser water circuits
Refrigerant line connections
Selection and Installation Guidelines
For optimal performance, TOBO recommends:
Thread Preparation: Use appropriate thread sealant or PTFE tape on male threads before assembly.
Proper Torque: Tighten connections using appropriate wrenches; avoid over-torquing.
Compatibility: Ensure compatibility with system media and operating conditions.
Regular Inspection: Periodically inspect for signs of wear, corrosion, or leakage.
Conclusion: Setting the Standard for Industrial Brass Fittings
The introduction of 3/8"-2" UNS C71500 Female Thread Seamless Forged Brass Tees represents TOBO's commitment to providing comprehensive, high-quality brass fitting solutions for the most demanding industrial applications. By combining the exceptional corrosion resistance and mechanical properties of 70/30 copper-nickel alloy with precision forging and seamless construction, TOBO enables engineers, contractors, and procurement specialists to specify with confidence for marine, chemical, and industrial systems.
Whether specified for seawater cooling systems on offshore platforms, chemical processing facilities, or marine plumbing applications, these brass tees 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 marine, chemical, industrial, and HVAC sectors. The company specializes in copper alloys, copper-nickel alloys, stainless steels, and associated products for demanding applications, with strict quality control and complete traceability.