S31803 Standard for Forged Socket Fittings and Threaded Fittings - ASME B1611 elements and mechanical properties.
S31803 is an UNS number, and the corresponding material is Duplex Stainless Steel 2205, which is a common duplex stainless steel alloy with excellent corrosion resistance and high mechanical strength.
For forged socket fittings and threaded fittings made of S31803, the production and inspection can refer to a number of standards, including the Chinese national standard GB T 14383 and the widely used American standard ASME B1611。asme b16.11. It stipulates the design, size, material requirements, manufacturing process, inspection methods and marking rules of forged steel pipe fittings, but does not directly specify in detail the elemental composition and mechanical properties of specific materials such as S31803.
Typical chemical compositions of S31803 duplex stainless steel include:
Chromium (CR): Approx. 210-23.0%
Nickel (ni): Approximately 45-6.5%
Molybdenum (Mo): about 30-3.5%
Nitrogen (n): about 008-0.20%
Its mechanical properties are usually manifested as:
Tensile strength (RM): 620 MPa
Yield strength (rp0.)2 or RS): 450 MPa
Elongation (a): 25%.
Hardness (HB): Approximately between 217 - 293.
Specific mechanical properties may vary depending on the state of heat treatment, the manufacturing process, and the manufacturer's requirements. When applying, ASME B16 should be selected according to the design specifications and project requirements11 standards, and the S31803 material socket welding and threaded pipe fittings provided by the first supplier shall be accompanied by relevant material certification and quality assurance documents.