銅ニッケル管 C71500

White copper tube is a metal pipe made of copper nickel alloy as the substrate, named after its silver white metallic luster on the surface. This type of pipe perfectly combines the excellent processing performance of copper with the corrosion resistance of nickel, playing an irreplaceable role in fields such as marine engineering, chemical engineering, and energy, and can be regarded as the “pioneer of corrosion resistance” in industrial materials.
1、 Material composition and classification
（1） Core alloy composition
The basic components of white copper tube are copper (銅) and nickel (ニ), which can be divided into various types according to the different nickel contents:
B10 white copper tube: containing about 10% nickel and about 90% 銅, it is one of the most common white copper tubes with balanced comprehensive performance.
B30 white copper tube: containing about 30% nickel and about 70% 銅, with stronger corrosion resistance, especially suitable for extreme corrosive environments.
Other models, such as B20 and BFe10-1-1 (with a small amount of iron), optimize their performance by adding elements such as iron, マンガン, and zinc.
（2） Classification method
Classified by purpose:
White copper tube for condensation: used in equipment such as heat exchangers and condensers, utilizing its good thermal conductivity and corrosion resistance.
Structural white copper tube: used for mechanical structures and piping systems, emphasizing strength and fatigue resistance.
Classified by production process:
Squeezed white copper tube: suitable for large-diameter, thick walled pipes with high strength.
Drawn white copper tube: high precision, smooth surface, mostly used for precision instruments or small-diameter pipelines.

2、 Core performance advantages
（1） Excellent corrosion resistance
Corrosion resistance of seawater: The corrosion rate in seawater is only 1/20 of ordinary carbon steel, even lower than stainless steel, making it a “標準” material for marine engineering. 例えば, B10 white copper pipes are commonly used in ship seawater cooling pipelines and offshore platform water delivery systems to avoid the risk of leakage caused by seawater corrosion.
Chemical medium resistance: It has good resistance to chemical solutions such as sulfuric acid, hydrochloric acid, and caustic soda. When used in the chemical industry to transport corrosive media (such as acidic solutions in fertilizer production), its service life far exceeds that of ordinary metal pipes.
Stress corrosion cracking resistance: In environments containing chloride ions (such as coastal industrial areas), stress corrosion cracking is less likely to occur, while stainless steel is prone to intergranular corrosion in such environments.
（2） Excellent physical and mechanical properties
Thermal conductivity: The thermal conductivity coefficient is about 1/3 of copper, which is lower than pure copper but better than most stainless steels. It is suitable as a heat exchanger tube (such as power plant condensers and air conditioning condensers).
Strength and toughness: The tensile strength can reach 300-500MPa, with an elongation of over 20%. It can withstand high pressure (such as high-pressure steam pipelines) and adapt to vibration or bending conditions (such as ship shaking environments).
Temperature resistance: The performance is stable within the temperature range of -200 ℃ to 300 °C, without embrittlement at low temperatures, and has strong oxidation resistance at high temperatures (nickel element forms a dense oxide film NiO).
（3） Processing and welding performance
It can be processed into various specifications of pipes through processes such as cold drawing and hot rolling, and can also undergo forming operations such as bending and expanding.
Good welding performance, when using argon arc welding, electric arc welding and other processes, no special flux is required, and the weld strength is close to the base metal.

3、 Typical application scenarios
（1） Marine engineering field
Shipbuilding: As a seawater cooling system pipeline (such as diesel engine cooling water pipeline), について 60% of B10 white copper pipes are used in the shipbuilding industry worldwide every year; In the seawater desalination system of luxury cruise ships, B30 white copper pipes can resist corrosion from high concentration saltwater.
Marine platforms: The seawater injection system of offshore oil drilling platforms and the water transmission pipelines of tidal power plants rely on the corrosion resistance of white copper pipes to achieve long-term stable operation.
（2） Chemical and Energy Industry
Chemical equipment: Transporting caustic soda solution in chlor alkali industry, ammonia containing medium in fertilizer plant, corrosive chemical solution in pharmaceutical plant. White copper tube can reduce the risk of medium pollution (copper nickel alloy itself is non-toxic).
Power industry: B10 white copper pipes are used in thermal power plant condensers to condense steam into water, and B30 white copper pipes are used in nuclear power plant seawater circulation systems to transport cooling water sources, ensuring safe operation of equipment.
（3） Other special fields
Salt production and food industry: brine conveying pipelines in salt production equipment and acidic beverage conveying pipelines in food processing plants, utilizing their corrosion resistance and hygiene properties (copper ions have a certain antibacterial effect).
Instruments and precision instruments: used for manufacturing pressure sensors, thermometer sleeves, or corrosion-resistant pipelines in medical devices due to their high material stability.

5、 Key points for selection and maintenance
（1） Selection suggestions
Select nickel content based on the corrosiveness of the medium: B10/B30 is preferred for seawater environments, and B30 or models with added alloy elements (such as BFe30-1-1) can be selected for strong acid-base environments.
Choose wall thickness based on pressure and temperature: for high-pressure conditions (>10MPa), thicker pipe walls are required, and for high temperatures (>300 °C), B30 material should be considered.
（2） Maintenance precautions
Avoid contact with dissimilar metals (such as direct connection between copper and steel) to prevent electrochemical corrosion.

Rinse the medium inside the pipe with clean water before long-term shutdown, especially after transporting seawater or chemical solutions, to reduce residual corrosion of the medium.
If there is a slight oxide layer on the surface, it can be wiped with a soft cloth dipped in a special copper alloy cleaner, and cannot be scraped with hard objects such as steel wire balls.
From the era of steamships a hundred years ago to today’s deep-sea exploration projects, white copper pipes have always guarded industrial pipeline systems with the attitude of being “corrosion-resistant”. With the development of new energy, ocean development and other fields, this copper nickel alloy pipe will demonstrate its value in more extreme working conditions and become an important bridge connecting material science and engineering applications.