Socket Weld Flange (SW)

Yunming Metal offers stainless steel socket weld flanges (SW) in DN15–DN3000 sizes. Ideal for small-diameter high-pressure pipelines, these flanges meet ANSI, EN, and JIS standards. Available in 304, 316L, 321, and 904L, with Class 150–2500 ratings and CNC-machined precision.

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Product Overview

Socket weld flanges (SW flanges) are designed for small-diameter, high-pressure pipelines. The pipe is inserted into a socket end and secured with a single fillet weld around the hub, offering a smooth bore and reducing turbulence. Stainless steel socket weld flanges are ideal for piping systems requiring strong structural integrity, especially where internal welding is difficult. Available in sizes from DN15 to DN3000 and compatible with ANSI, EN, and JIS standards.

Application Areas

Oil and gas distribution lines
Chemical and petrochemical processing
Steam and thermal fluid piping
Power plants and industrial equipment
Offshore installations and marine piping
Skid-mounted systems and small-bore process lines

Product Features

Smooth bore reduces pressure drop and flow restriction
Single fillet weld minimizes risk of weld failure
Ideal for small-diameter, high-pressure pipelines
Manufactured in 304, 316L, 321, and duplex stainless steel
Pressure ratings from Class 150 to 2500 / PN6 to PN100
Suitable for corrosive, high-temperature, and high-stress environments
CNC-machined surface with optional RF or RTJ face
Standards: ANSI B16.5, EN 1092-1, JIS B2220, DIN, ISO

Technical Specifications

Parameter	Range
Nominal Size (DN)	DN15 – DN3000
Outside Diameter (OD)	34 mm – 3200 mm (approx. 1⁵⁄₁₆″ – 126″)
Thickness (T)	9 mm – 120 mm (approx. ³⁄₈″ – 4¾″)
Socket Depth	10 mm – 60 mm (approx. ³⁄₈″ – 2³⁄₈″)
Pressure Ratings	Class 150 – Class 2500 / PN6 – PN100
Material Grades	ASTM A182 F304 / F316 / F316L / F321 / 904L / 2205 etc.
Standards	ANSI B16.5, EN 1092-1, JIS B2220, DIN, BS, ISO
Type	Socket Weld Flange (SW) with raised face or ring type joint
Connection Type	Socket-type weld with fillet weld on outside only
Surface Finish	CNC machined, anti-rust oil coating
Application	Small bore high-pressure lines in oil, steam, gas, and chemical systems

Manufacturing Process

Material Selection – Stainless steel billets or plates selected per required spec
Forging & Cutting – Flanges forged or cut to size and heat treated
Socket Machining – Boring of socket to tight tolerance
Bolt Hole & Face Machining – Drilling and surface finish via CNC
Marking & Quality Control – Inspected and stamped per standard
Protection & Packaging – Anti-corrosion treatment and protective packaging

FAQ

Q1: What sizes are available for socket weld flanges?
A: We manufacture from DN15 to DN3000 (approx. ½″ to 120″) with custom options.

Q2: Are socket weld flanges suitable for high-pressure systems?
A: Yes. They are widely used for small-diameter high-pressure lines up to Class 2500.

Q3: What’s the difference between socket weld and slip on flanges?
A: Socket weld flanges require a fillet weld only on the outside, while slip on flanges are fillet welded on both sides.

Q4: Can you provide test certificates and third-party inspection?
A: Yes. EN 10204 3.1/3.2 MTCs and third-party inspections are available on request.

Q5: What face types are available?
A: Raised face (RF) is standard. Ring Type Joint (RTJ) face is also available for high-pressure sealing.

Still have questions?
Feel free to contact us for more details or to discuss your custom stainless steel socket weld flange requirements. Our technical support team is ready to assist with specifications, certifications, and delivery.