Next, let's focus on copper and brass.
Copper tube: The copper tube used in our refrigeration industry is copper, with a copper content of more than 99.90%. It has the good characteristics of copper metal, a high-quality basic metal, and is widely used in various industrial and civil fields, and plays an important role. There are mainly three types: TP2, T2, and TU1.
TP2 is phosphorus deoxidized copper, containing 0.015-0.04% phosphorus, with good welding and cold bending performance. It is widely used in the manufacturing fields of air conditioning and refrigeration connecting pipes, stove gas connection pipes, and electric heating pipes.
T2 is pure copper with a copper content of more than 99.90%. When users have higher electrical conductivity requirements for materials, T2 copper tubes will be the first choice.
TU1 is oxygen-free copper with a copper content of ≥99.97%, extremely low oxygen and impurity content, high purity, excellent electrical and thermal conductivity, good ductility, processing performance, welding, corrosion resistance, and cold resistance. Due to its high production requirements and high costs, its product price is much higher than other types of copper tubes.
Brass tube: copper-zinc alloy tube, the number after the letter H in the brand often represents the middle value of its copper content, and the zinc content is the rest. Brass tubes of different brands, as the copper content increases, generally show better quality and extension performance. Mainly used as water pipes and wading connectors.
2. Judgment of the quality of copper tubes
1. Generally, it is necessary to observe the appearance of the copper tube to judge in procurement. The first thing is to look at the color of the copper tube. Different color judgments are made according to the type of copper tube purchased. For example, copper tubes, generally reddish red copper is good copper, and inferior copper has impurities.
2. Generally, good copper tubes are made of pure copper, which will have better ductility, so high-quality copper tubes will have a deep line. After scratching the inside of the copper tube, if it is the same as the outer wall, it means that the overall quality of the copper pipe fittings is relatively high. But if the color or other aspects are different, it is very likely that some substances such as iron have been added to it. However, better copper tubes are mostly used in the military industry and its special industries.
3. Generally, processed copper tubes are mainly divided into three types: hard, semi-hard, and soft. Different forms have different flexibility, which can generally be determined by bending the copper tube. High-quality copper tubes are very easy to bend, but if it is difficult to bend or cracks appear after bending, it indicates that the quality of the copper tube is not very good.
3. Calculation formula for weight and length of TP2 copper tube for air conditioner:
Weight per meter (kg/m) = 0.02796 × wall thickness (mm) × (outer diameter - wall thickness) (mm)
Length per kilogram (m/kg) = 1/weight per meter
