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China, Chinese ASTM B167/167m Copper-Nickel Alloy Tubing for Marine & Ship-Building Works1 Industrial Products Supplier Manufacturer Details, price list catalog:
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Product Description ASTM B167/167M Copper-Nickel Alloy Tubing for Marine & Ship-building WorksCopper-nickel alloys (primarily 90-10 Cu-Ni and 70-30 Cu-Ni) are essential materials in marine engineering and shipbuilding due to their unique combination of corrosion resistance, anti-fouling properties, and mechanical durability in seawater environments. Below are the key reasons for their widespread use: 1. Superior Corrosion Resistance in SeawaterProblem with Other Metals:Carbon steel rusts rapidly in seawater, requiring expensive coatings and cathodic protection.Stainless steel (316L, duplex) can suffer from pitting and crevice corrosion in chloride-rich seawater.Aluminum is prone to galvanic corrosion when coupled with other metals. Why Cu-Ni Excels:Forms a protective oxide layer that resists saltwater corrosion, erosion, and cavitation damage.Highly resistant to biofouling (discussed next).Performs well in both flowing and stagnant seawater (unlike stainless steel, which needs oxygen to maintain its passive layer). 2. Natural Antifouling Properties (Biofouling Resistance)Problem with Biofouling in Marine Environments:Marine organisms (barnacles, algae, mussels) attach to ship hulls and pipes, causing:Increased drag → Higher fuel consumption (up to 40% more!)Blocked cooling systems → Overheating & maintenance costsMicrobial-induced corrosion (MIC) → Premature failures Why Cu-Ni is the Best Choice:Copper ions (Cu2) leach slowly from the alloy, killing marine organisms and preventing attachment.Eliminates the need for toxic antifouling paints (which are being banned due to environmental regulations).Self-healing surface-even if scratched, the oxide layer reforms, maintaining protection.→ Ships using Cu-Ni hulls or piping report up to 30% less fuel consumption due to reduced drag! 3. Excellent Erosion & Cavitation ResistanceProblem in Marine Systems:High-velocity seawater (e.g., in pumps, propellers, condensers) causes erosion-corrosion in carbon steel and even stainless steel.Cavitation (bubble implosion) damages metal surfaces over time. Why Cu-Ni Performs Better:High toughness and work-hardening ability resist wear in turbulent flow.70-30 Cu-Ni is especially durable in seawater piping, propeller shafts, and heat exchangers. 4. Compatibility with Other Marine Materials (No Galvanic Corrosion Issues)Problem with Mixed-Metal Systems:Stainless steel + aluminum or carbon steel + bronze can create galvanic corrosion in seawater. Why Cu-Ni is Safe:Moderate electrochemical potential-can be safely used with stainless steel, bronze, and titanium without severe galvanic corrosion.Used in condenser tubes, seawater piping, and heat exchangers without isolation flanges. 5. Long Service Life & Low MaintenanceProblem with Traditional Materials:Carbon steel pipes in seawater last 5-10 years before replacement.Stainless steel (316L) may last 15-20 years but requires frequent cleaning to prevent bio-fouling. Why Cu-Ni is Cost-Effective Long-Term:50+ year lifespan in seawater with minimal maintenance.No need for: Cathodic protection (unlike carbon steel)Chlorination/biocides (unlike stainless steel)Anti-fouling coatings (unlike aluminum/steel hulls) → Despite higher upfront cost, Cu-Ni reduces life-cycle costs by 50%+ compared to carbon steel. 6. Key Applications in Marine & ShipbuildingApplicationWhy Cu-Ni is UsedSeawater Piping SystemsNo corrosion, no biofouling.Heat Exchangers & CondensersHigh thermal conductivity + corrosion resistance.Ship Hulls & SheathingPrevents biofouling, reducing fuel costs.Propeller Shafts & BearingsResists cavitation & wear.Offshore Platform ComponentsHandles splash zone corrosion.Desalination PlantsResists brine corrosion & scaling.7. Future Trends Driving Cu-Ni DemandStricter environmental laws banning toxic anti-fouling paints (e.g., TBT-based coatings).Fuel efficiency regulations pushing for bio-fouling-resistant hulls.Growth in offshore wind & desalination, where Cu-Ni is used in critical seawater systems. ConclusionCopper-nickel alloys are indispensable in marine and shipbuilding because they:Resist seawater corrosion & bio-fouling naturally.Reduce fuel costs by keeping hulls/pipes clean.Last 50+ years with minimal maintenance.Are environmentally friendly (no toxic coatings needed).While stainless steel and carbon steel still have their uses, Cu-Ni is the best choice for seawater applications where longevity and efficiency matter most.For more details on specific carbon and alloy steel tubing and pipes, please refer to the specific product details or contact us at your convenience.Company ProfileProduct DescriptionDetailed Photos Packaging & Shipping Certifications FAQ
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