Copper pipe refers to a copper material made by pressing or drawing copper. Because of its strong and wear-resistant properties, it is often used in electrical, industrial and construction industries. Copper pipes can be produced by extrusion, continuous casting and rolling, and up-drawing methods. Copper pipe is an important raw material for the processing and manufacturing of refrigeration equipment. It has two main purposes: ① Making heat exchangers. ② Make connecting pipes and fittings.
Classification of copper pipes
1. Air-conditioning copper pipes can be roughly divided into ordinary air-conditioning copper pipes and degreased air-conditioning copper pipes:
Ordinary air conditioners: the thickness is generally 2 points, 3 points, 0.5mm thick, 4 points 0.6mm thick, 5 points and 6 points 0.7mm thick. Mainly used for R22.
Degreasing air-conditioning copper pipe: also known as "de-oiling air-conditioning copper pipe", 2 points, 3 points are 0.8mm thick, 4 points, 5 points, 6 points are 1.0mm thick. Mainly used for refrigerants such as R410.
2. Specific classification of air-conditioning copper pipe materials:
Oxygen-free copper: including high-purity oxygen-free copper (TU0, TU1, TU2) and phosphorus deoxidized copper (TUP, TP1, TP2, etc.), characterized by very little oxygen content, and a small amount of deoxidizer remains in the deoxidized copper;
Aerobic copper: mainly ordinary pure copper (T1, T2, T3, etc.) and tough pitch copper, characterized by high oxygen content;
Special copper: There are arsenic copper, silver copper, tellurium copper, etc., which are characterized by adding different trace alloy elements to achieve the purpose of improving the overall performance of the material.
Let's focus on red copper and brass below.
Copper tube: The copper tube used in the refrigeration industry has a copper content of more than 99.90%. It has the good characteristics of copper as a high-quality basic metal. It is widely used in various fields of industry and civil use, and plays an important role. effect. There are mainly three types: TP2, T2, and TU1.
TP2 is phosphorous deoxidized copper, containing 0.015-0.04% phosphorous content. It has good welding and cold bending performance. It is widely used in the manufacturing fields of air-conditioning refrigeration connecting pipes, gas connection pipes for stoves, and electric heating pipes.
T2 is pure copper, and the copper content is higher than 99.90%. When users have higher electrical conductivity requirements for the material, T2 copper tube will be the better choice.
TU1 is oxygen-free copper with copper content ≥99.97%, extremely low oxygen and impurity content, high purity, excellent electrical and thermal conductivity, good ductility, good processing performance, welding, corrosion resistance, and cold resistance. Because of its high production requirements and high cost, the price of its products is higher than other types of copper pipes.
Brass tube: copper-zinc alloy tube, the number after the H letter in the grade often represents the middle value of its copper content, and the zinc content is the remainder. Brass tubes of different grades generally show better quality and elongation performance as the copper content becomes higher and higher. Mainly used as connection parts for water pipes and wading.