ASTM A182 Alloy Steel Socket Weld Flange 1/2" to 24" Size Range with 150-2500 Pressure Class Rating
Alloy steel socket weld flanges are engineered with specialized alloying elements including molybdenum, manganese, nickel, chromium, vanadium, silicon, and boron. These components deliver exceptional performance characteristics including high strength, superior toughness, wear resistance, corrosion resistance, and temperature stability from cryogenic to high-temperature applications.
| Specification | Details |
|---|---|
| Size Range | 1/2" to 24" |
| Pressure Class | 150, 300, 400, 600, 900, 1500, 2500 |
| Thickness | Sch10S to Sch160 |
| Standards | ASME/ANSI B16.5/B16.47, JIS B2220 |
| Type | Socket Weld (SW) |
| Applications | Offshore, Oil Field, Shipbuilding, Water Systems, Natural Gas, Pipe Projects, Electric Power |
| Testing Methods | Direct-reading Spectrograph, Hydrostatic Testing, X-ray Detection, Ultrasonic Flaw Detection, Magnetic Particle Detection |
| Certifications | Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report |
| Grade | Steel Names | C | Mn | Si | P | S | Cr | Mo |
|---|---|---|---|---|---|---|---|---|
| ASTM A182 F1 | C-0.5Mo | 0.15 max | 0.3-0.6 | 0.5 | 0.03 | 0.03 | 4-6 | 0.44-0.65 |
| ASTM A182 F5 | 5Cr-0.5Mo | 0.15 max | 0.3-0.6 | 0.5-1.0 | 0.03 | 0.03 | 4-6 | 0.44-0.65 |
| ASTM A182 F9 | 9Cr-1Mo | 0.15 max | 0.3-0.6 | 0.5-1.0 | 0.03 | 0.03 | 8-10 | 0.9-1.1 |
| ASTM A182 F11 | 1.25Cr-0.5Mo-Si(CL1/CL3) 1.25Cr-0.25Mo-Si (CL2) |
0.5-0.15 | 0.3-0.6 | 0.5-1.0 | 0.03 | 0.03 | 1.0-1.5 | 0.44-0.65 |
| ASTM A182 F12 | 1Cr-0.5Mo | 0.15 max | 0.3-0.6 | 0.5 | 0.03 | 0.03 | 4-6 | 0.44-0.65 |
| ASTM A182 F22 | 2.25Cr-1Mo | 0.5-0.15 max | 0.3-0.6 | 0.5 | 0.03 | 0.03 | 4-6 | 0.44-0.65 |
| ASTM A182 F91 | 0.15 max | 0.3-0.6 | 0.5-1.0 | 0.03 | 0.03 | 8-10 | 0.9-1.1 |
- Originally developed for small-size high-pressure piping applications
- Static strength equivalent to slip-on flanges
- 50% greater fatigue strength compared to double-welded slip-on flanges
- Single fillet weld connection for simplified installation
- Designed with 1/16" (1.6 mm) expansion gap to reduce residual stress
Socket weld flanges connect to pipes using a single fillet weld on the exterior. Critical to their design is the mandatory 1/16" expansion gap between the pipe end and flange shoulder, which minimizes residual stress during weld metal solidification. This feature makes them ideal for high-pressure systems while maintaining installation efficiency.
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