Why is the cylinder block made of aluminum?

However, changes in material costs result in higher costs. Due to differences in material prices and processing techniques, the price of using cylinder (aluminum) engines is naturally higher than that of cast iron engines. At this point, it is evident that cast iron engine cylinders dominate.

Due to low-pressure pneumatic conveying, the cylinder is made of aluminum or aluminum alloy, generally not exceeding 0.8 megapascals, and the aluminum alloy cylinder is filled with pressure. The hydraulic transmission pressure can reach up to 32 megapascals or even higher, and the strength of aluminum alloy materials cannot withstand it. Therefore, the main components of the hydraulic cylinder are made of steel.

Most small computers use aluminum alloy because the working pressure is not very high and the heating and oxidation changes of aluminum are minimal, while large ship engines use other alloys. The pressure of the hydraulic cylinder is very high, and there is a lot of oil guiding liquid, so oxidation is basically not needed to be considered. The cylinder (made of aluminum) is lightweight, low-cost, and can meet airtightness requirements. Due to the permeability of oil molecules, hydraulic cylinders are less likely to leak together with steel.