Metal pipes are used in industrial and civil construction, in industries, etc.
Steel pipes are relatively inexpensive, while at the same time durable and reliable in operation. But steel pipes have one drawback - susceptibility to corrosion, that is why it has zinc coating on both outer and inner sides of the pipe. Therefore, the service life is 30-40 years.
Copper pipes are much less susceptible to various external influences, corrosion, ultraviolet radiation, changes in atmospheric pressure or precipitation. The service life of copper pipes is at least 70 years without changing its properties. It can operate in a wide temperature range - from –200 to +500 °С. Copper pipes are well suited for cold and hot water supply and heating systems.
Oils are bushings made most often from cast iron, using gravity or centrifugal casting. They are used to make piston rings or liners for the engine block.