Normally, the corresponding UNS number of 304 stainless steel is S30400, and the widely used name in the industry is 304 or 14301 (according to the European standard EN 10088-1). Therefore, we can refer to the elemental composition and mechanical properties of 304 stainless steel to discuss its standards for forged socket fittings and threaded fittings.
Elemental composition (typical):
Chromium (CR): 180 - 20.0%
Nickel (Ni): 80 - 10.5%
Carbon (c): 008%
Manganese (MN): 20%
Silicon (Si): 10%
Phosphorus (p): 0045%
Sulfur (s): 0030%
Mechanical properties (approximate, depending on manufacturing state and heat treatment conditions):
Tensile strength (RM): 515 MPa
Yield strength (rp0..)2 or rp): 205 MPa
Elongation (a): 40%.
Hardness (Brinell hardness Hb): Generally not used as the main index to evaluate the mechanical properties of austenitic stainless steel.
Forged socket fittings and threaded fittings made of 304 stainless steel should comply with ASME B1611. The basic provisions of the standard, which are mainly applicable to the design, size, pressure level, material requirements, and inspection methods of forged steel pipe fittings. Although B16The 11 standard is not specifically for 304 stainless steel, but fittings made of this material also need to meet the general requirements of the standard and be produced and accepted in combination with other specific standards or specifications applicable to stainless steel fittings.
304 stainless steel pipe fittings are widely used in the fields of chemical industry, food processing, pharmaceutical, water treatment and general industrial piping systems because of their excellent corrosion resistance and good weldability.