Copper Nickel 70/30 SWRF Flange Class 150 ASME B16.5 Forged Marine Anti-Biofouling

Copper Nickel 70/30 SWRF Flange Class 150 ASME B16.5 Forged Marine Anti-Biofouling
 
1.Product Description

The Copper Nickel Flange is a precision-engineered piping component manufactured from either 90/10 (UNS C70600) or 70/30 (UNS C71500) copper‑nickel alloys. These alloys are renowned for their exceptional resistance to seawater and chloride-bearing environments. The flanges are produced through a controlled manufacturing route that includes hot forging, solution annealing, CNC machining, and rigorous non‑destructive testing (ultrasonic and magnetic particle inspection). Each piece is finished with acid pickling and passivation to remove surface contaminants and to promote the formation of a stable, protective oxide film. The sealing faces (raised face, flat face, ring joint, or tongue‑and‑groove) are machined to specified surface roughness to ensure reliable gasket seating. All dimensions conform to ASME B16.5, EN 1092‑1, or GB/T 9119 standards, and each flange is permanently marked with material grade, size, pressure class, and heat number for full traceability.

2.Product Applications

These flanges are primarily employed in fluid systems that handle seawater, brackish water, or aggressive chemicals. Key application sectors include:

• Commercial Shipbuilding and Repair: Seawater cooling circuits, ballast water treatment systems, fire‑fighting mains, and auxiliary service lines on cargo vessels, tankers, cruise ships, and ferries.

• Offshore Oil & Gas Platforms: Seawater lift pumps, firewater deluge networks, heat exchanger cooling bundles, and water injection lines for reservoir pressure maintenance.

• Desalination Plants: Intake, pre‑treatment, high‑pressure brine discharge, and product water transfer pipelines in both thermal (MSF/MED) and membrane (RO) facilities.

• Coastal Power Stations: Once‑through or recirculating cooling water systems for condensers, auxiliary cooling pumps, and chlorination injection lines.

• Industrial Process Equipment: Heat exchangers, evaporators, and condensers in chemical, petrochemical, and HVAC plants where the process media contain chlorides or organic acids.

• Aquaculture and Mariculture: High‑flow oxygenated seawater supply networks for fish and shellfish farming.

3 . Product Advantages

1. Unmatched Seawater Corrosion Resistance – The protective cuprous oxide/nickel hydroxide film that forms naturally on the alloy surface offers self‑healing properties, giving corrosion rates below 0.025 mm/year (90/10) and as low as 0.01 mm/year (70/30) in flowing seawater, significantly outperforming 316L stainless steel.

2. Inherent Biofouling Deterrence – Slow release of copper ions creates a hostile microenvironment for barnacles, mussels, and algae, sharply reducing the need for chemical cleaning or mechanical scraping, thus lowering operational costs and environmental impact.

3. High Strength and Erosion Resistance – The 70/30 grade delivers tensile strength ≥490 MPa and resists erosion‑corrosion from high‑velocity turbulent flow and cavitation, making it ideal for pump discharge lines, elbows, and reducers.

4. Excellent Weldability and Formability – Both alloys are readily welded using TIG, MIG, or manual arc processes with matching filler metals, producing sound, crack‑free joints with mechanical properties equal to the base material.

5. Wide Temperature Capability – Retains mechanical integrity and corrosion resistance from cryogenic temperatures (-196°C) up to 300°C continuous service, without embrittlement or phase degradation.

6. Low Lifecycle Cost – Despite higher initial material cost, the extended service life (often 2‑3 times that of stainless steel in seawater) and drastically reduced maintenance, downtime, and cleaning interventions yield substantial long‑term savings.

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​4.Key Product Specification

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