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ASTM A790 S31803 DUPLEX Stainless Steel PIPE
ASTM A790 S31803 is a specification for duplex stainless steel pipe. Duplex stainless steel is a type of stainless steel that contains both austenite and ferrite phases in its microstructure, which gives it enhanced mechanical properties and corrosion resistance compared to traditional stainless steels.
The S31803 grade refers to the specific composition of the duplex stainless steel, which typically consists of around 22% chromium, 5-6% nickel, 3% molybdenum, and small amounts of other elements such as nitrogen and manganese.
ASTM A790 is the standard specification for seamless and welded duplex stainless steel pipe. It covers pipes of various sizes and wall thicknesses, and specifies the requirements for chemical composition, mechanical properties, and testing methods.
The S31803 duplex stainless steel pipe is commonly used in various industries such as oil and gas, chemical processing, and marine applications. It offers excellent resistance to corrosion, high strength, and good weldability.
Overall, ASTM A790 S31803 duplex stainless steel pipe is a reliable and versatile material that is suitable for a wide range of applications.
Chemical Composition:
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| UNS S31803 | Min Max | -0.03 | -2 | -1 | -0.03 | -0.02 | 21.0 - 23.0 | 2.5 - 3.5 | 4.5 - 6.5 | 0.08 - 0.20 |
S31803 DUPLEX Stainless Steel PIPE Mechanical Behaviour:
| Mechanical Properties | 2205 Duplex Steel Seamless Pipe |
| Tensile strength | 620 MPa min |
| Yield strength | 450 MPa min |
| Elongation | 25% min |
| Brinell hardness | 293 HB max |
| Rockwell hardness | 31 HR C max |
Application:
1. Oil and Gas Industry: The high corrosion resistance and strength of ASTM A790 S31803 make it suitable for use in oil and gas exploration, production, and refining applications. It is used in offshore platforms, subsea piping systems, and pipelines for transporting corrosive fluids.
2. Chemical Processing Industry: Duplex stainless steel pipes are used in chemical processing plants for handling corrosive chemicals and fluids. They are resistant to pitting, crevice corrosion, and stress corrosion cracking, making them suitable for various chemical processes.
3. Desalination Plants: The high resistance to chloride-induced corrosion makes ASTM A790 S31803 pipes suitable for use in desalination plants. They are used in seawater intake and brine outfall systems, as well as in the processing of seawater into fresh water.
4. Power Generation: Duplex stainless steel pipes are used in power plants for various applications, including heat exchangers, condensers, and cooling systems. They offer excellent resistance to corrosion and erosion, which is crucial in power generation environments.
5. Food Processing Industry: ASTM A790 S31803 pipes are used in the food processing industry for handling corrosive food products and fluids. They are resistant to organic acids, such as acetic acid and citric acid, and are easy to clean and maintain.
6. Structural Applications: Duplex stainless steel pipes are used in structural applications where high strength and corrosion resistance are required. They are used in construction, bridges, and infrastructure projects.
7. Water and Wastewater Treatment: The high corrosion resistance of ASTM A790 S31803 pipes makes them suitable for use in water and wastewater treatment plants. They are used in piping systems, filtration units, and chemical dosing systems.