SS316L SW Flange refers to a core connecting component used in industrial piping systems for small diameter, high-pressure applications. Its structural feature is a socket in the flange bore, the pipe is inserted into the socket and fixed by a fillet weld. This design combines connection strength and sealing stability, and is widely compatible with global industrial piping standards. HT PIPE supply all different types and scales of flanges. Please feel free to contact us for further product information and pricing.
stainless steel 316l material Chemical Composition Standards
The core components are: Carbon ≤0.03%, Chromium 16.00%-18.00%, Nickel 10.00%-14.00%, Molybdenum 2.00%-3.00%, with the remainder being iron. The combination of low carbon and molybdenum is the core guarantee of its corrosion resistance.
ss316l material Physical and Mechanical Properties
Physical properties: Density 7.98 g/cm³, melting point 1375-1450℃, solution annealing temperature range 1010-1150℃, followed by rapid cooling to maintain performance.
Mechanical properties: Tensile strength ≥485 MPa, yield strength ≥170 MPa, elongation ≥30%, reduction of area ≥40%, hardness <200 HV, non-magnetic, excellent plasticity and toughness at room and low temperatures, cannot be strengthened by heat treatment, only through cold working.
316l stainless steel Core Advantages in Corrosion Resistance
Compared to 304 stainless steel, 316L, due to its molybdenum content, has significantly improved resistance to pitting and crevice corrosion, and can be safely used in environments containing chloride ions and other halogen ions. It performs excellently in high-temperature environments with sulfuric acid concentrations below 15% or above 85%, marine environments, and corrosive industrial atmospheres.
SS316L SW Flange also has better resistance to carbide precipitation than 316 stainless steel, requiring no additional stabilization treatment after welding, thus avoiding intergranular corrosion, and is suitable for thick-section welded components and equipment.
SS316L SW Flange Structural Design Advantages
s316l flange weld structure
The socket weld structure is primarily designed for small-diameter pipes of NPS 4 and below, with the most widespread application in scenarios involving pipes of NPS 2 and smaller. Its significant structural feature is the positioning step inside the flange bore. After the pipe is inserted into the socket, it is fixed against this step, requiring only a single fillet weld on the outside to complete the connection.
S31603 flange neck structure
SW flanges all feature a neck design. The neck structure enhances the flange's rigidity and pressure resistance, effectively dispersing vibrations and stresses in the piping system and preventing deformation and cracking at the connection.
s316l flange sealing surface
The common sealing surface is the raised face (RF), suitable for medium and low-pressure applications, for high-pressure scenarios (Class 600 and above), a ring-type joint (RTJ) can be customized, using a metal ring gasket to achieve zero-leakage sealing.
The inner diameter of the flange transitions smoothly to the inner diameter of the pipe without any significant steps, making it particularly suitable for applications requiring specific fluid velocity and cleanliness. It is important to note that the depth of the SW flange socket must strictly match the outer diameter of the pipe, usually with a 1.6mm-3mm assembly clearance to ensure connection strength and concentricity after welding.
