What are the main characteristics of stainless steel pipes

Main features of various stainless steel pipes Currently, the pipes supplied on the market are mainly galvanized steel pipes, lined plastic galvanized steel pipes, PVC plastic pipes, PP-R plastic pipes, aluminum-plastic composite pipes, copper pipes, plastic-coated copper pipes. It consists of stainless steel lined plastic pipe and stainless steel outer plastic pipe.  Let's analyze the main characteristics of these pipes one by one, so as to choose the pipes correctly and reasonably. Galvanized steel pipe: Cheap price, high mechanical strength, but easy to rust, easy to scale on the inner wall of the pipe and breed bacteria, short service life, it is eliminated in the water supply field.  Plastic-lined galvanized steel pipe is a poorly considered product.  It makes the pipeline thick and clumsy, it also increases the manufacturing cost, and it fails to eliminate the defects that are most susceptible to corrosion and short service life at the connection threads of the galvanized steel pipe, so it is a product that should not be promoted.  PVC and PP-R pipes: They are both plastic pipes, which are characterized by easy manufacture, light weight and low price.  However, the mechanical strength is low, the anti-destructive property is poor, it is easy to age, and it is slightly toxic (although polypropylene is non-toxic, plasticizers and color concentrates are all toxic).  It is also difficult to judge if the manufacturer has adulterated and lowered the quality, so it is only suitable for occasions with low requirements and short-term use.  Aluminum-plastic composite pipe: It has the advantages of easy bending, less number of pipe joints for long-distance transportation, and convenient transportation of pipes.  However, there is a serious bottleneck at the connection between the pipe and the joint, causing a great loss of flow.  In addition, if the connection between the pipe and the joint is more than two times, the pressure resistance and pull resistance will be significantly reduced after repeated installation.  In addition, since the joint is made of brass, nickel-green pipe joints are prone to produce patina, and harmful metal substances such as lead may be precipitated on the surface. Therefore, aluminum-plastic composite pipes are generally not used for direct drinking water transportation.  Copper tube: It has the function of regularly inhibiting the growth of bacteria.  Mechanical strength and rubber products' resistance to destruction are also good, but they are not acid-resistant and easily oxidized to produce patina in a humid environment, which is also a toxic substance.  In addition, because its thermal conductivity is too large, it must be well insulated if it is used to transport hot water.  Plastic copper pipe: Although the defect of rapid heat dissipation of copper pipe is eliminated, the production cost is increased.  And it has the defect that the outer plastic layer is easy to age and shorten the service life.  Stainless steel lined plastic and outer composite plastic pipe: It is a poorly considered product.  Because the service life of stainless steel and plastic is too large, it should not be promoted.  Thick wall all stainless steel pipe: Because it has many advantages such as corrosion resistance and pollution-free, excellent mechanical properties, good resistance to destruction, low thermal conductivity, durability, luxurious appearance, etc., it is the pipe with the best performance.  Because of this, all stainless steel piping systems have been used very early in the pharmaceutical, chemical, and beverage packaging industries.  In Japan and Germany, the water supply pipe network has all adopted stainless steel pipe systems.  However, traditional thick-walled stainless steel piping systems have not been promoted and applied in the fields of municipal water supply and building water supply due to the high consumption of stainless steel materials and the high price. Due to economic constraints.  Thin-walled all-stainless steel pipe: This is a new generation of water pipes that China leads the world. This system abandons the traditional thread twist connection method and uses a homogeneous plug connector to achieve a sealed connection of the pipeline, so it can reduce the thickness of the stainless steel pipe.  The pipe wall greatly reduces the cost of pipe laying.