Tube sheet UNS S31803 ASTM A182 F51 Tube sheet
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A tubesheet is a critical component in heat exchangers, boilers, condensers, and other types of pressure vessels that use a system of tubes for heat transfer or fluid flow. It is a thick, flat plate or disc with a series of holes drilled into it to hold the tubes in place. Tubesheets are used to secure one end of each tube, creating a reliable seal and facilitating the transfer of heat or fluid between different sections of the system.
UNS S31803 tubesheet refers to a tubesheet made from UNS S31803 plate or A182 F51 Forged discs typically used in heat exchangers, boilers, and other pressure vessels
UNS S31803 is a duplex stainless steel grade, which is a combination of austenitic and ferritic microstructures. This gives it a balance of excellent mechanical properties and enhanced resistance to corrosion, particularly in chloride-rich environments.
Typical Composition of UNS S31803:
- Chromium (Cr): 21.0 – 23.0%
- Nickel (Ni): 4.5 – 6.5%
- Molybdenum (Mo): 2.5 – 3.5%
- Manganese (Mn): 0.0 – 2.0%
- Silicon (Si): 0.5 – 1.0%
- Carbon (C): ≤ 0.03%
- Phosphorus (P): ≤ 0.03%
- Sulfur (S): ≤ 0.02%
- Nitrogen (N): 0.08 – 0.20%
- Iron (Fe): Balance
Application of S31803 tube sheet
- Heat Exchangers: UNS S31803 tube sheets are often used in heat exchangers where corrosion resistance is critical, especially in industries like chemical processing, petrochemicals, marine environments, and power generation.
- Pressure Vessels: The material is suitable for high-pressure environments, making it common in pressure vessel fabrication where resistance to internal and external stress is required.
- Boilers and Condensers: In applications with high temperatures and steam, such as in boilers and condensers, duplex stainless steel tube sheets provide the necessary durability and corrosion resistance.
- Desalination Plants: Due to its resistance to chloride-induced stress corrosion cracking, UNS S31803 is often used in desalination systems.
