Which is better, aluminum alloy shell or stainless steel shell? The excellent characteristics of aluminum and its alloys are good appearance, light weight, machinability, physical and mechanical properties, as well as good corrosion resistance, so that aluminum and its alloys are considered to be the most economical and practical in many application fields. The density of aluminum is only 2.7g/cm3, about 1 / 3 of that of steel, copper or brass (7.83g/cm3, 8.93g/cm3, respectively). In most environmental conditions, including air, water (or salt water), petrochemistry and many chemical systems, aluminum can show excellent corrosion resistance.

The surface of aluminum is highly reflective. The radiant energy, visible light, radiant heat and electric wave can be effectively reflected by aluminum, and the surface of anodizing and dark anodizing can be reflective or absorbent. The polished aluminum has excellent reflectivity in a wide wavelength range, so it has various decoration purposes and reflective functions.

Aluminum usually shows excellent conductivity and thermal conductivity. Some specific aluminum alloys with high resistivity have been developed successfully, which can be used in motors with high torque. Aluminum is often used because of its excellent conductivity. On the basis of equal weight, the conductivity of aluminum is nearly twice that of copper. The thermal conductivity of aluminum alloy is about 50-60% of that of copper, which is beneficial to the manufacture of heat exchanger, evaporator, heating appliances, cooking utensils, as well as the cylinder head and radiator of automobile.

Aluminum is non ferromagnetic, which is an important characteristic for electrical and electronic industries. Aluminum can not self ignite, which is important for applications involving handling or contact with flammable and explosive materials. Aluminum is nontoxic and is often used to make containers for food and drink. Its natural surface state has a pleasant appearance. It is soft and glossy, and for beauty, it can also be colored or dyed with texture patterns.

We have learned that the strength of some aluminum alloys is higher than that of structural steel, but the strength and hardness of pure aluminum and some aluminum alloys are very low. In modern life, aluminum has been widely used in various industries.