Introduction to the classification of white copper for white copper tubes

Among copper alloys, cupronickel is widely used in shipbuilding, crude oil, chemical industry, construction, electric power, precision instruments, medical machinery, musical instrument production and other departments as corrosion-resistant parts due to its excellent corrosion resistance and easy shaping, processing and welding. Some cupronickel also has special electrical properties, which can be used to make resistance elements, thermal resistance materials and compensation wires. Non-industrial-grade cupronickel is mainly used to make decorative handicrafts.
White copper is a copper-based alloy with nickel as the main additive element. It is silver in color and has a metallic texture, so it is called white copper. Copper and nickel can be endlessly solid-soluted with each other to form a continuous solid solution, that is, no matter how much they are in each other, they are always α-single-phase alloys.
Cupronickel classification
General cupronickel
Copper-nickel binary alloy (that is, binary cupronickel) is called general cupronickel. In ordinary white copper, the letter B indicates the content of nickel, such as: B5 indicates that the nickel content is about 5%, and the others are about copper content. The models are B0.6, B19, B25, B30.
Industrial cupronickel
Industrial-grade cupronickel is divided into two categories: structural cupronickel and cupronickel for precision resistance alloys (electrical cupronickel).
Structural cupronickel: The structure of cupronickel is characterized by good mechanical properties and corrosion resistance, and beautiful color. Among the structural cupronickel, B30, B10 and zinc cupronickel are commonly used. In addition, there are also aluminum-nickel-nickel, iron-nickel-nickel and niobium-nickel-nickel. B30 has strong corrosion resistance in white copper, but the price is relatively expensive. The performance of aluminum nickel copper is close to that of B30, high quality and low price, and can be used as a substitute for B30. Zinc cupronickel was produced and applied in China in the 15th century, and it is called "Chinese silver". The so-called nickel silver or German silver also belongs to this type of zinc cupronickel. Zinc can be dissolved in a large amount in copper and nickel, resulting in solid solution strengthening and corrosion resistance. After zinc-nickel-nickel copper is added with lead, it can be smoothly cut and processed into various precision parts, so it is widely used in instrumentation equipment and medical devices. This type of alloy has strong strength and corrosion resistance, good elasticity, beautiful appearance, high quality and low price. Aluminum in aluminum cupronickel can significantly improve the strength and corrosion resistance of the alloy, and its precipitates can also produce precipitation hardening effects. Structural cupronickel is widely used in the manufacture of precision machinery, chemical machinery and ship components. (
Cupronickel for precision resistance alloys (nickel-nickel): copper-nickel for precision resistance alloys (nickel-nickel) has better thermoelectric properties. BMn3-12 manganese copper, BMn40-1.5 constantan, BMn43-0.5 test copper and new constantan with manganese instead of nickel (also known as nickel-free manganese white copper, containing 10.8-12.5% manganese, 2.5-4.5% aluminum, 1.0- 1.6%) is manganese nickel copper with different manganese content. Manganese white copper is a precision resistance alloy. This alloy has strong resistance and low temperature coefficient of resistance, and is suitable for making standard resistance elements and precision resistance elements. It is a material for the manufacture of precision electrical instruments, rheostats, meters, precision resistors, strain gauges, etc. Constantan and test copper have high thermoelectric potential and can also be used as thermal resistance and compensation wire.