1. Metal materials
Cast iron: It is suitable for low-pressure, norm-temperature and neutral media (such as water and air), but it has poor corrosion resistance and is prone to rust due to dissolved oxygen or electrolytes in the medium. It will corrode rapidly in high-salinity environments such as seawater.
Stainless steel (such as 316L) : It has strong corrosion resistance and can resist various chemical media (including solutions containing chloride ions), and is suitable for harsh scenarios such as chemical engineering and seawater desalination.
Alloy steel (such as chromium-molybdenum alloy steel) : It has stable performance in high-temperature and high-pressure environments. For instance, in the high-pressure pipelines of catalytic cracking units in oil refineries, chromium-molybdenum alloy steel valves can withstand high-temperature steam and pressure fluctuations.
Nickel-based alloys: They have excellent high-temperature and high-pressure resistance, making them suitable for extreme working conditions such as nuclear power plants and high-temperature reactors.
2. Non-metallic materials
Rubber (such as nitrile rubber) : It has good oil resistance, but is prone to corrosion in strong oxidizing acid environments. It is suitable for general oil transportation.
Plastics (such as PTFE) : They are almost resistant to the corrosion of all chemical substances and are an ideal choice for transporting highly corrosive media such as concentrated sulfuric acid in the chemical industry.
Ceramics (such as alumina ceramics) : They feature high hardness and strong wear resistance, making them suitable for high-wear scenarios like slurry transportation in mines.
