Durable And High-pressure Piping Solution
Socket weld flanges offer durable, high-pressure piping connections with excellent corrosion resistance, ideal for oil, gas, and chemical systems.
Durable And High-pressure Piping Solution
Socket weld flanges offer durable, high-pressure piping connections with excellent corrosion resistance, ideal for oil, gas, and chemical systems.
Features a small raised portion around the flange bore, acting as a seat for the gasket to promote effective sealing.
Designed with a precision-machined groove on the raised face, enabling the placement of a gasket ring for superior sealing performance.
A socket weld flange closely resembles a slip-on flange but is distinguished by a shoulder inside the bore, ensuring stronger and more reliable pipe positioning.
Socket Weld Flange is a forged fitting with a socket to insert the pipe, welded for a strong, leak-proof connection. Compliant with ASME B16.5, it uses carbon steel, stainless steel, and alloys for durability. As of August 19, 2025, it remains a preferred choice.
The High-Pressure Flange features a recessed area for pipe insertion, welded around the socket, offering pressure ratings up to 3000 PSI for Class 1500. Available in sizes from 1/2” to 4”, it suits high-pressure and high-temperature systems.
Socket Weld Flange undergoes ultrasonic and hydrostatic testing for reliability. Coated with galvanizing or FBE, it resists corrosion and operates from -20°C to 600°C, making it ideal for oil and gas and chemical processing as of August 2025.
Compared to slip-on flanges, Socket Weld Flange provides superior strength and fatigue resistance for high-pressure applications. Proper welding techniques ensure a secure joint, with a service life of 20–40 years.
Socket Weld Flange addresses challenges like leaks and pressure loss in industrial piping, offering a robust solution for oil, gas, and chemical systems as of August 19, 2025.
Socket weld flanges have a socket in which a pipe is inserted; the pipe is secured by one fillet weld located on the exterior of the flange hub.
A significant disadvantage with this type of flange is that it is not considered a high-integrity joint because the weld is difficult to prove; thus socket weld flanges are only suitable for low to medium classes (≤ ASME 600). Due to their lower integrity and unsuitability for use at higher pressures, socket weld flanges almost always have flat or raised faces.
The advantage of socket weld flanges is their simple design, they are well suited for small pipe size applications e.g. 2 inches (5cm) and below, and for non-critical applications e.g. non-hazardous systems; they are not suitable for highly erosive or corrosive systems.
For larger nominal sizes, it is safe to assume that a socket weld flange would be made to order for your application, due to the fact that larger pipe size assemblies will typically call for a slip on or weld neck connection.
| Class | Raised Face |
|---|---|
| ANSI 150 | Socket, ANSI Class 150 (in) |
| ANSI 300 | Socket, ANSI Class 300 (in) |
| ANSI 400 | Socket, ANSI Class 400 (in) |
| ANSI 600 | Socket, ANSI Class 600 (in) |
| ANSI 900 | Socket, ANSI Class 900 (in) |
| ANSI 1500 | Socket, ANSI Class 1500 (in) |
| ANSI 2500 | Socket, ANSI Class 2500 (in) |
SS304 Socket weld flange
Explore Socket Weld Flange with targeted long-tail keywords for specifications, applications, and welding solutions as of August 2025.
Note: Socket Weld Flange meets ASME and DIN standards, ensuring reliable performance. Contact suppliers for specs.
The most common type, featuring a raised sealing surface that concentrates the bolting force on a smaller area.
Has a flat sealing surface, commonly used with cast iron flanges and for low-pressure applications.
Features a groove for metal ring gaskets (oval or octagonal), providing metal-to-metal sealing.
Features matching tongue and groove surfaces, providing self-alignment and confined gasket area.
Flange faces have to be smooth enough to ensure a tight, leak-free seal for bolted flanges.
| Flange Face Type | Flange Face Type | Flange Face Type |
|---|---|---|
| Type A: flat face | Type D: groove face | Type G: O Ring recess |
| Type B: raised face | Type E: spigot | Type H: O Ring groove |
| Type C: tongue face | Type F: recess |
| ASME B16.5 | Pipe Flanges NPS 1/2 - 24 |
| ASTM A105 | Forged Carbon Steel |
| ASTM A350 LF2 | Low-Temperature Service |
| ASTM A182 | High-Temperature Service |
| ASTM A694 | High-Pressure Transmission |
| DIN EN 1092-1 | European Standard PN 2.5-400 |
Most commonly used, forged with machined surfaces
Corrosion resistant, grades 304, 316, etc.
High-temperature and high-pressure applications
Cast iron, aluminum, brass, bronze, plastic
| Material Category | Fittings (ASTM Grade) | Flanges (ASTM Grade) | Valves (ASTM Grade) | Bolts & Nuts (ASTM Grade) |
|---|---|---|---|---|
| Carbon Steel | A234 Gr WPA | A105 | A216 Gr WCB | A193 Gr B7 A194 Gr 2H |
| A234 Gr WPB | A105 | A216 Gr WCB | ||
| A234 Gr WPC | A105 | A216 Gr WCB | ||
| Carbon Steel
Alloy (High-Temperature) |
A234 Gr WP1 | A182 Gr F1 | A217 Gr WC1 | A193 Gr B7 A194 Gr 2H |
| A234 Gr WP11 | A182 Gr F11 | A217 Gr WC6 | ||
| A234 Gr WP12 | A182 Gr F12 | A217 Gr WC6 | ||
| A234 Gr WP22 | A182 Gr F22 | A217 Gr WC9 | ||
| A234 Gr WP5 | A182 Gr F5 | A217 Gr C5 | ||
| A234 Gr WP9 | A182 Gr F9 | A217 Gr C12 | ||
| Carbon Steel
Alloy (Low-Temperature) |
A420 Gr WPL6 | A350 Gr LF2 | A352 Gr LCB | A320 Gr L7 A194 Gr 7 |
| A420 Gr WPL3 | A350 Gr LF3 | A352 Gr LC3 | ||
| Austenitic Stainless Steel | A403 Gr WP304 | A182 Gr F304 | A182 Gr F304 | A193 Gr B8 A194 Gr 8 |
| A403 Gr WP316 | A182 Gr F316 | A182 Gr F316 | ||
| A403 Gr WP321 | A182 Gr F321 | A182 Gr F321 | ||
| A403 Gr WP347 | A182 Gr F347 | A182 Gr F347 |
ASTM standards define the specific manufacturing process of the material and determine the exact chemical composition of pipes, fittings and flanges, through percentages of the permitted quantities of carbon, magnesium, nickel, etc., and are indicated by "Grade".
The usual materials of flanges include stainless steel, carbon steel, aluminum and plastic. The choice of the material largely depends on the purpose of the flange. For example, stainless steel is more durable and is necessary for heavy use. On the other hand, plastic is more feasible for use in the home because of its reasonable price and easy installation. The materials used for flanges are under the designation of the American Society of Mechanical Engineers.
The most common materials for pipe flanges (forged grades) are: ASTM A105 (carbon steel high temperature to match A53/A106/API 5L pipes), A350 Grades LF1/2/3 (carbon steel low temperature to match A333 pipes), A694 Grades F42 to F80 (high yield carbon steel to match API 5L pipe grades), ASTM A182 Grades F5 to F91 (alloy steel flanges to match A335 pipes), A182 Grade F304/316 (stainless steel flanges to match A312 SS pipes), A182 Gr. F44/F51/F53/F55 (duplex and super duplex to match A790/A928 pipes) and various nickel alloy grades (Inconel, Incoloy, Hastelloy, Monel).
The material qualities for these flanges are defined in the ASTM standards.
Metal flanges are classified from 150 to 2500 # rating for different pressure applications.
Incoloy 825 Flange
Industries Using
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