Socket Weld Flanges – ASME/ANSI B16.5

VikTech Fittings is a leading manufacturer, exporter, and supplier of Socket Weld Flanges in compliance with ASME/ANSI B16.5 and international standards. Socket Weld Flanges are designed for small-bore, high-pressure pipelines, providing a strong, leak-proof joint between pipes and flanges. They are welded on the outer side of the pipe, while the inner pipe rests on the shoulder of the flange bore for proper alignment.

What is a Socket Weld Flange?

A Socket Weld Flange (SW Flange) has a socket (recess) in the bore where the pipe is inserted. The pipe end is fillet-welded around the hub of the flange, giving a smooth bore and better fluid flow compared to threaded joints. These flanges are widely used in high-pressure, high-temperature, and small-diameter piping systems.

Types of Socket Weld Flanges

• Raised Face Socket Weld Flange (RF-SW)

• Flat Face Socket Weld Flange (FF-SW)

• Ring Type Joint Socket Weld Flange (RTJ-SW)

• Reducing Socket Weld Flanges

• Custom-Made Socket Weld Flanges

Materials & Grades

✅ Carbon Steel Socket Weld Flanges

• ASTM A105 / A105N

• ASTM A350 LF2 (Low Temperature CS)

• ASTM A694 F42 – F70

✅ Stainless Steel Socket Weld Flanges

• ASTM A182 F304 / 304L

• ASTM A182 F316 / 316L

• ASTM A182 F321 / F347

✅ Duplex & Super Duplex Steel Socket Weld Flanges

• UNS S31803 / S32205

• UNS S32750 / S32760

✅ Alloy Steel Socket Weld Flanges

• ASTM A182 F1, F5, F9, F11, F22, F91

✅ Nickel Alloys & Special Grades

• Inconel 600 / 625 / 800 / 825

• Monel 400 / K500

• Hastelloy C22 / C276

• Alloy 20

• Copper Nickel (Cu-Ni) 70/30, 90/10

• Titanium Gr.2 / Gr.5

Advantages of Socket Weld Flanges

• Ideal for small bore & high-pressure piping

• Provides stronger & smoother flow compared to threaded flanges

• Leak-proof, durable, and corrosion resistant

• Requires less welding compared to butt weld joints

• Easy to align and assemble

Applications of Socket Weld Flanges

• Oil & Gas processing plants

• Refineries & Petrochemical industries

• Power generation & boiler systems

• Shipbuilding & offshore structures

• Water treatment & desalination plants

• Chemical & pharmaceutical industries

Technical Specifications

Specification ItemDetailsStandardASME/ANSI B16.5, B16.47, MSS-SP44, DIN, EN 1092-1, JIS B2220, BS 4504Size Range½” (DN15) to 24” (DN600)Pressure RatingClass 150, 300, 600, 900, 1500, 2500Facing TypesRF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint)Weld TypeFillet Weld on outer side onlyTestingPMI, UT, Hydro Test, NDT, NACE MR0175, IBR, Third-Party InspectionCertificationEN 10204 3.1 / 3.2, ISO, CE