CuNi 90/10 Copper Nickel Plate Marine Alloy Sheet ASME SB127 Shipbuilding

Product Specification

CuNi 90/10 Copper Nickel Plate Marine Alloy Sheet ASME SB127 Shipbuilding

1. Product Description
The ASTM B127 CuNi 90/10 Copper Nickel Plate is a high-performance alloy sheet manufactured under strict ASTM International standards. Composed of approximately 90% copper and 10% nickel with minor additions of iron and manganese, this plate offers exceptional resistance to seawater corrosion and biofouling. Available in both hot-rolled and cold-rolled finishes, it delivers excellent mechanical properties, good formability, and reliable weldability, making it the preferred material choice for demanding marine and offshore environments.

2. Key Specifications

3. Applications

• Shipbuilding and hull structures

• Offshore oil and gas platforms

• Seawater piping systems and heat exchangers

• Condensers and evaporators

• Valves, pumps, and fittings exposed to marine conditions

• Desalination plants and coastal power generation facilities

4. Product Advantages

• Superior Marine Corrosion Resistance: Exceptional resistance to saltwater pitting, crevice corrosion, and stress corrosion cracking in chloride-rich environments.

• Anti-Biofouling Properties: The copper-nickel alloy naturally inhibits algae, barnacle, and marine organism attachment, reducing maintenance costs.

• High Strength with Excellent Ductility: Combines robust mechanical strength with good elongation, allowing for easy forming, bending, and welding without compromising integrity.

• ASTM Certified Quality: Fully compliant with ASTM B127, ensuring consistent chemical composition and mechanical performance across every batch.

• Long Service Life: Proven track record of 20+ years of reliable performance in severe marine applications, reducing lifecycle replacement costs.

5. Product Functions

• Provides structural strength and corrosion barrier in seawater-contacting components

• Transfers heat efficiently in condenser and heat exchanger systems

• Withstands high-pressure and high-temperature operating conditions

• Prevents galvanic corrosion when paired with other marine-grade metals

• Maintains dimensional stability under thermal cycling and mechanical stress

6. Operating & Handling Instructions

• Store in a dry, well-ventilated indoor area away from acidic or alkaline chemicals

• Handle with soft slings or padded lifting equipment to prevent surface scratches

• For welding, use matching CuNi filler metals (e.g., ERCuNi) and preheat to 150-200°C for thick sections

• Post-weld annealing is recommended for sections over 25mm thickness to relieve residual stress

• Clean surfaces with non-abrasive solvents or warm water; avoid steel wool or iron-based brushes to prevent surface contamination

7. Precautions

• Do not expose the plate to strong oxidizing acids (e.g., nitric acid) as they may cause rapid corrosion

• Avoid contact with mercury, ammonia, or sulfur compounds which can degrade alloy performance

• Ensure proper ventilation during welding to prevent fume inhalation

• Inspect surfaces for cracks or defects before installation; if found, consult the supplier

• For high-temperature service above 450°C, contact our technical team for additional guidance

8. Shipping & Delivery

• Minimum Order Quantity: 1 PC

• Delivery Time: 15-30 working days after order confirmation

• Supply Capacity: 10 Tons per Month

• Shipping methods include sea freight, air freight, or express courier based on order quantity and destination

• All shipments are tracked and insured; tracking numbers provided within 48 hours of dispatch

• For urgent orders, expedited shipping options are available upon request

9. Payment Terms

• Payment Methods: T/T (Telegraphic Transfer), Western Union

• Pricing: Negotiable based on quantity, specification, and delivery terms

• Standard payment schedule: 30% deposit upon order confirmation, 70% balance before shipment

• Full payment is required for orders below MOQ or custom-cut sizes

• Proforma invoice will be issued with final payment terms confirmed in the sales contract

10. Packaging
All plates are packed in standard export wooden crates or steel-framed bundles to ensure safe transit. Each plate is interleaved with protective kraft paper or plastic film to prevent moisture and scratching. Edge protectors and strapping bands are applied for additional stability. Packaging is compliant with international shipping regulations and suitable for long-distance ocean or air freight. Custom packaging with labels and marking is available upon request.

11. Returns, Exchanges & After-Sales Support

• We accept returns within 14 days of receipt only for manufacturing defects or material non-conformance verified by third-party inspection

• Exchange or replacement is offered for damaged or incorrectly shipped items at no extra cost

• To initiate a return, contact our customer service with order number, photos, and defect description within 48 hours of delivery

• Return shipping costs are covered by the buyer unless the issue is our fault

• All products carry a 12-month quality warranty against material defects under normal operating conditions

• Our technical support team is available 24/7 to assist with installation, welding, or application inquiries

• For after-sales issues, we commit to response within 24 hours and resolution within 7 working days