Stainless Steel 904L Socket Weld Flanges

Stainless Steel 904L Socket Weld Flanges (often abbreviated as SW Flanges) are mechanical fasteners primarily designed for small-diameter, high-pressure piping systems. This flange type features a recessed area (or socket) into which the pipe is inserted.1 It is then permanently secured to the pipe by a single fillet weld on the outside of the flange . This design provides good structural strength and flow characteristics, though a gap must be left between the pipe end and the socket shoulder to prevent cracking of the weld from thermal stresses.2 The material, SS 904L, is a high-alloy super austenitic stainless steel known for its exceptional resistance to corrosion, specifically against sulfuric acid, phosphoric acid, and chloride-rich environments.3 The high Copper and Molybdenum content ensures superior performance in aggressive media. The main application of SS 904L Socket Weld Flanges is in chemical processing, petrochemical plants, hydraulic systems, and stream lines where high joint integrity and high working pressures are critical, especially for pipe sizes $\text{NPS 4}$ and smaller. Zeron Fasteners manufactures and supplies these specialized flanges for demanding industrial service.

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