CuNi 70/30 Pipe Fittings Forged ASME B16.9 Seamless

Product Specification

CuNi 70/30 Pipe Fittings Forged ASME B16.9 Seamless

1. Product Description

Copper Nickel Fittings are manufactured from premium CuNi 70/30 (UNS C71500) raw material through hot forging or seamless forming process, featuring butt weld connection type. The products are manufactured in strict accordance with ASME B16.9 standard, covering a complete range of elbows, tees, reducers, end caps, stub ends and other pipe fittings. Due to their excellent seawater corrosion resistance and anti-biofouling properties, copper nickel alloy fittings are widely used in shipbuilding, seawater desalination, offshore oil platforms, chemical heat exchangers and other marine and industrial piping systems.

2. Key Product Parameters

3. Product Types Available

4. Product Applications

• Marine seawater cooling pipeline systems

• Offshore oil & gas platform firefighting and ballast water systems

• Seawater desalination plant (MED/MSF process) piping connections

• Coastal power plant condensers and heat exchangers

• Chemical industry corrosive media transport pipelines

• Offshore engineering subsea pipeline systems

• Ship freshwater generator piping systems

• Ship bilge and ballast piping systems

• LNG terminal seawater vaporization systems

• Marine aquaculture recirculating water systems

5. Product Advantages

1. Excellent Seawater Corrosion Resistance: CuNi 70/30 alloy exhibits extremely low corrosion rates in both flowing and stagnant seawater, with a service life exceeding 20 years.

2. Superior Anti-Biofouling Performance: Copper element naturally inhibits marine microorganism adhesion, reducing pipeline blockage risks and maintenance frequency.

3. High Erosion-Corrosion Resistance: Material maintains good corrosion resistance under high-velocity seawater scouring, with maximum allowable flow velocity up to 3.5-4.0 m/s.

4. Forging & Seamless Process Assurance: Hot forging and seamless forming processes ensure uniform and dense grain structure, eliminating casting defects and significantly better mechanical properties.

5. Complete Range of Fittings: Full range of elbows, tees, reducers, end caps and stub ends available to meet all piping system configuration requirements.

6. Good Weldability: Compatible with CuNi 70/30 pipes for butt welding, enabling convenient on-site installation with reliable weld joint strength. TIG and MIG welding processes recommended.

7. Low Maintenance Cost: Self-healing passive film forms on material surface, eliminating the need for additional coatings or cathodic protection, with low lifecycle costs.

8. High Dimensional Accuracy: ASME B16.9 standard strictly controls tolerances to ensure perfect fit with standard CuNi pipes and flanges.

6. Product Functions

• Change direction of seawater flow in piping systems (Elbows 45°/90°/180°)

• Branch or combine seawater flow streams (Equal Tee / Reducing Tee)

• Transition between different pipe diameters (Concentric / Eccentric Reducers)

• Close and seal pipe ends (End Caps)

• Facilitate flanged connections with backing flanges (Stub Ends)

• Provide reliable butt weld connections that maintain full pipe system integrity

• Withstand rated working pressure to ensure safe operation of piping systems

• Adapt to long-term stable operation in marine humid and salt spray environments

7. User Instructions

Pre-Installation Preparation:

1. Inspect each fitting appearance, confirm no cracks, deformation, surface defects or other imperfections.

2. Verify fitting type, size, wall thickness, and material grade against design drawings and material specifications.

3. Clean fitting weld ends, removing oil, grease, oxide scale and other impurities.

4. Ensure proper fit-up alignment between fitting and pipe ends, with uniform root gap for butt welding.

Installation Steps:

1. Align fitting and pipe ends with proper root gap as per welding procedure specification.

2. Tack weld at minimum 4 points evenly distributed around circumference.

3. Use TIG (GTAW) welding process for root pass with ERCuNi filler metal.

4. Complete fill and cap passes using TIG or MIG (GMAW) with compatible CuNi filler metal.

5. Control interpass temperature not exceeding 150°C to avoid alloy element burn-off.

6. Ensure full penetration and proper reinforcement at weld joints.

7. Remove welding slag and spatter after each pass.

Post-Installation Inspection:

1. Conduct visual inspection of all welds for surface defects.

2. Perform penetrant testing (PT) or radiographic testing (RT) as per project requirements.

3. System hydrostatic test pressure shall be 1.5 times design pressure, hold for minimum 30 minutes without leakage or pressure drop.

8. Product Precautions

1. Avoid Direct Contact with Carbon Steel: Copper-nickel alloy fittings in contact with carbon steel may cause galvanic corrosion. Must be stored and transported separately. Use wooden pallets or non-metallic separators.

2. Avoid Ammonia-Containing Media: Copper alloys are prone to stress corrosion cracking in ammonia environments. Strictly prohibited for ammonia or amine-containing systems.

3. Welding Shielding Gas Requirement: Pure argon or argon-helium mixture must be used as shielding gas during TIG welding to prevent weld oxidation and porosity. Ensure adequate back purging for root pass protection.

4. Avoid Excessive Seawater Flow Velocity: Although CuNi 70/30 has excellent erosion-corrosion resistance, continuous flow velocity is recommended not to exceed 3.5m/s, especially at elbows and tee branches where turbulence intensifies.

5. Avoid Dissimilar Metal Mixing in Same System: Piping systems should maintain material uniformity to avoid galvanic corrosion risks. If dissimilar metal connection is required, insulating joints or dielectric couplings must be installed.

6. No Post-Weld Heat Treatment Required: CuNi alloy generally does not require post-weld heat treatment. However, all welding spatter, slag and surface oxides must be thoroughly removed after welding.

7. Proper Storage Requirements: Store in dry and ventilated indoor warehouse area. Avoid outdoor exposure, rain and direct sunlight. Ambient humidity should be ≤ 60%. Keep away from carbon steel and other dissimilar metals.

8. Handle with Care: Copper nickel fittings are relatively soft compared to steel. Avoid dropping, dragging or impacting during handling to prevent surface damage and deformation.

9. Shipping Information

• Shipping Origin: Direct shipment from China factory

• Delivery Time:

  • Standard sizes and types: 3-7 working days (ex-stock)

  • Custom sizes or non-standard types: 15-30 days (subject to quantity and specifications)

• Shipping Methods:

  • Small orders / Samples: International Express (DHL, FedEx, UPS, TNT), 3-7 days delivery

  • Bulk orders: Sea freight FCL (Full Container Load) or LCL (Less than Container Load), 15-45 days delivery

  • Urgent orders: Air freight, 5-10 days delivery

• Documents Provided:

  • Commercial Invoice

  • Packing List with detailed itemized contents

  • Certificate of Origin (CO)

  • Material Test Certificate (MTC per EN 10204 3.1 or 3.2)

  • Mill Test Reports including chemical composition and mechanical properties

  • Bill of Lading (B/L) or Air Waybill (AWB)

  • NDT reports (if required by purchase order)

• Trade Terms: FOB, CIF, CFR, EXW available

• Logistics Tracking: Tracking number provided immediately upon dispatch, full shipment traceability

10. Payment Information

• Standard Payment Methods:

  • T/T (Telegraphic Transfer): 30% advance payment upon order confirmation, 70% balance payment before shipment

  • L/C at Sight: Irrevocable Letter of Credit at sight accepted (issued by reputable international bank)

  • Western Union: Applicable for sample orders and small amount payments

• Credit Customers:

  • Long-term and repeat customers may apply for O/A (Open Account) credit terms, subject to credit review and approval

  • Monthly or quarterly settlement terms available for customers with established 1+ year cooperation history

• Settlement Currency:

  • USD (US Dollar) - preferred

  • EUR (Euro)

  • CNY (Chinese Yuan)

  • Other currencies negotiable

• Bank Information: Official company bank account details provided upon formal contract signing

• Payment Notes:

  • Order becomes effective and production commences upon receipt of advance payment

  • Flexible installment payment plans negotiable for large volume orders

  • All payments must clearly reference Proforma Invoice number or Sales Contract number

  • Bank charges are to be borne by remitter (payer)

11. Packaging Information

• Standard Packaging Options:

  • Small fittings (≤2" NB): Individual polybag or bubble wrap protection + sturdy export-grade carton box

  • Medium fittings (2-1/2" - 8" NB): Individual bubble wrap / EPE foam wrap + plywood case or wooden crate

  • Large fittings (≥10" NB): Individual wrapping + palletized packing with fumigated wooden crate

• Moisture & Corrosion Prevention Measures:

  • Anti-rust / anti-tarnish protective coating applied on all surfaces (easily removable before welding)

  • Silica gel desiccant packets placed inside sealed packaging

  • VCI (Vapor Corrosion Inhibitor) packaging materials used when specified

  • Vacuum-sealed aluminum foil packaging available upon request for long-term storage or tropical destinations

• Marking & Labeling:

  • Each fitting permanently marked with: Material Grade, Size, Wall Thickness, Heat Number, Manufacturer Logo

  • Outer packaging clearly marked with: Product Description, Specification, Quantity, Net/Gross Weight, Dimensions

  • Standard international handling labels applied: Fragile, Keep Dry, This Side Up, Handle with Care

• Custom Packaging Options:

  • Customer-specified shipping marks / logos on outer packaging

  • Custom labeling and barcoding for warehouse management

  • Split / partial shipment packaging arrangements

  • Consolidated packaging for mixed orders (fittings + flanges + pipes)

• Packaging Cost:

  • Standard export packaging included in product quotation

  • Special / custom packaging requirements charged at actual cost

  • Vacuum packaging and VCI materials priced upon request

12. Purchase, Return & After-Sales Service

Purchase Process:

1. Customer sends inquiry with required fitting types, sizes, wall thickness, quantities and material specifications

2. Sales team provides detailed quotation including unit prices, total amount, delivery terms and estimated lead time

3. Both parties confirm all technical parameters, delivery schedule, payment terms and sign formal Sales Contract / Proforma Invoice

4. Customer arranges advance payment (30% T/T or as agreed)

5. Factory schedules production upon receipt of advance payment

6. Production completed, quality inspection and testing conducted internally

7. Customer inspection or third-party inspection arranged (optional, prior notice required)

8. Customer arranges balance payment

9. Shipment arranged upon receipt of full payment

10. Full set of original shipping and quality documents dispatched to customer

Return & Exchange Policy:

• Quality-Related Returns:

  • If products are found with material non-conformance, manufacturing defects, or dimensional deviations exceeding standard tolerances, customer must notify in writing within 30 days of receipt of goods

  • Upon mutual confirmation and verification of the quality issue, supplier shall provide:

    • Free replacement of defective products, OR

    • Full refund of the affected product value

  • Supplier shall bear all round-trip freight costs for quality-related returns/replacements

  • Photos, test reports or inspection data required for claim processing

• Non-Quality Returns:

  • Returns due to customer order errors (incorrect size, type or quantity ordered) accepted within 15 days of receipt

  • Products must be in original, unopened and undamaged packaging condition

  • Products must not have been welded, installed, modified or used

  • Customer bears all round-trip freight costs

  • Restocking fee of 15-20% may apply depending on product type

• Non-Returnable Situations:

  • Products that have been welded, installed, heat-treated or modified in any way

  • Non-standard or custom-made sizes/types specifically manufactured for the order

  • Products damaged due to improper storage, handling, installation or usage by customer

  • Returns requested beyond the applicable return period (15 days non-quality, 30 days quality)

After-Sales Service:

• Warranty: 12 months from date of shipment against manufacturing defects and material non-conformance under normal usage conditions

• Technical Consultation: Professional technical support team available 24/7 via email, phone, WhatsApp, WeChat and other instant messaging platforms

• On-Site Service: Experienced engineers available for on-site installation guidance, welding procedure support and troubleshooting for major projects (service fees and travel expenses negotiable)

• Documentation Support:

  • EN 10204 3.1 Material Test Certificates (standard with every shipment)

  • EN 10204 3.2 Material Test Certificates (available upon request with third-party inspection)

  • NDT reports: Radiographic Testing (RT), Ultrasonic Testing (UT), Penetrant Testing (PT)

  • PMI (Positive Material Identification) reports

  • Third-party inspection reports from BV, SGS, TÜV, DNV, Lloyds etc.

• Complaint Response Commitment:

  • Initial response to any complaint within 24 hours (working days)

  • Investigation report and proposed solution within 72 hours

  • Resolution implementation initiated within 5 working days of mutual agreement

• Long-Term Support:

  • Repeat order discounts for established customers

  • Priority production scheduling for urgent requirements

  • Regular updates on new products and technical developments in copper-nickel alloys

  • 1. Are you trading company or manufacturer ?
    We are manufacturer ,You can see the certification.
    2. How long is your delivery time?
    Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
    3. Do you provide samples ? is it free or extra ?
    Yes, we could offer the sample for free charge but need pay the cost of freight.
    4. What is your terms of payment ?
    Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.