1. Chemical composition:

Heat piece aluminum alloy grades are mainly 1100,1200,8011,8006 and so on. Perspective on the use of air conditioning on the chemical composition of the aluminum sheet heat exchanger is not critical. Without surface treatment, corrosion resistance, 3A21 aluminum can is relatively good, high strength and elongation and other mechanical properties, hardness is also large. What kind of alloy chosen depends on the degree of difficulty to reach the final mechanical material properties and ant process. Such as high purity 1100 aluminum rolling easier, while 8011 alloy is more difficult.

2, the mechanical properties:

Mechanical properties mainly refers to the tensile strength of aluminum foil, elongation and Erichsen value. From the use of point of view, I hope these three indicators, the higher the better, but on the material itself, these three indicators and mutually contradictory, that is, when the tensile strength of the aluminum foil is relatively high elongation index will decline; and improve the elongation when the aluminum foil, will cause a decline in tensile strength. Therefore, in practice, generally take the mechanical properties of the intermediate values, and specific strength and ductility values but also with the punching piece mold machining heat related. Punching processing generally divided into heat sheet stretched and unstretched type two. Stretch-type punching processing plastic mold requires better foil, namely higher elongation, the relative intensity values ??may be slightly lower; and no higher tensile strength mold with aluminum foil, plastic belongs to the secondary target. Factors that affect the mechanical properties of the aluminum foil more, mainly chemical composition and processing aluminum foil. On the strength and ductility for aluminum foil, by adjusting the chemical composition or change the machining process and parameters, or the strength of the plastic material in a certain range while maintaining the same one that the other has changed. In other words, you can change the value of aluminum foil with limited strength and ductility by adjusting the chemical composition and processing technology.

Heat transfer sheet according to the requirements of different mechanical properties, currently in use aluminum foil there are three: H22, H24, H26. Each state corresponds to a certain range of strength and ductility. From the current status of the domestic aluminum industry point of view, the scope of each state of the mechanical properties there is no uniform standard. While in the practical application of mechanical performance range is too wide for each state, unable to control the mechanical properties of the product, in order to achieve so that users satisfaction. Table 1 shows a typical heat exchanger and mechanical properties of aluminum alloys status value.