Introduction to ASME Flanged Socket Welding Fittings

The ASME Flanged Socket Weld is classified according to American standards, also known as Socket Weld Flange, High Neck Flange, or Long Neck Flange, etc.

The American standard raised face butt weld flange has a taller neck compared to the Chinese standard raised face butt weld flange. Due to different standards, the required dimensions for the butt weld flanges also vary.

American Standard Flanged Socket Welding Flange Features

Weld neck flanges offer convenient connections and can withstand high pressure. For weld neck flanges, the material varies depending on the pressure grade, ranging from low-pressure asbestos gaskets to high-pressure asbestos gaskets and metal gaskets.

Specification Model

1/2“~24"

Pressure Rating

150LB、300LB、600LB、900LB、1500LB、2500LB ;

Sealing Surface Type

Rounded Face (RF), Flat Face (FM), Bulb Face (M), Tongue Face (T), Groove Face (G), Full Face (FF).

ASME Flanged Socket Welding Fittings Material

Carbon Steel Flanges (CS): ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70.

Stainless Steel Flanges (SS): ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8

Alloy Flanges (AS): ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8/Ⅲ

Standard of Implementation

ASME B16.5

ANSI B 16.47

Connection Type

ASME焊接法兰 consists of two welding flanges and a gasket, secured together with bolts to complete the connection. The ASME flanges feature holes, and the bolts ensure a tight fit between the flanges. A gasket is used to seal the space between the flanges.

Production Process

Cutting is the forging process of splitting billets or trimming off ends.

2. Twisting is a forging process that involves rotating a portion of the butt-welding flange relative to the other by a certain angle.

3. Bending is a forging process that shapes the stock into a specific angle or appearance.

4. Forging down is the process of hammering the forged flange along the axial direction to reduce its height and increase the cross-sectional area. This operation is commonly used for forging gear blanks and other disc-shaped forgings.

5. Drawing out is a forging process that increases the length of a butt weld flange while reducing its cross-section, commonly used to produce rough castings for shaft components, such as lathe spindles.

Procurement Recommendations

1: Recommend purchasing from a reputable颈焊法兰 manufacturer with a certain production scale.

2: manufacturers of flanges are required to provide material inspection reports and relevant documents for neck-welded flanges.

3: Neck flanged weld necks require corresponding specification model embossments and markings.