Socket Weld Flanges
What are Socket Weld Flanges?
Socket Weld Flanges are pipe flanges with a recessed socket where the pipe is inserted and then fillet welded around the outer edge. This ensures a smooth bore and strong, leak-proof joint. Asiad Steel Industries is a trusted manufacturer and exporter of premium-quality Socket Weld Flanges designed for compact, high-pressure piping systems.
These flanges are widely used in small-diameter, high-temperature, and high-pressure pipelines where cleanliness and structural integrity are critical.
Key Features
Leak-Proof
Jointing
Durable
Construction
Strong Welded
Joint
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Pipe Size (NPS) | ½” to 24” (DN15 – DN600) |
| Pressure Ratings | ANSI / ASME Class Class 150, 300, 600, 900, 1500, 2500 PN Ratings |
|
| Flange Types | Socket Weld Flanges | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Special Types | Reducing Socket Weld Flanges, Custom-Machined Socket Weld Flanges | |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 |
| Carbon Steel | ASTM A105, ASTM A350 LF2 | |
| Alloy / Superalloy | Alloy Steel (ASTM A182 F1, F5, F9, F11, F22, F91), Inconel 600/625/825 | |
| Duplex & Super Duplex | Duplex 2205, Super Duplex 2507 | |
| Other Materials | Monel 400/K500, Nickel 200/201, Titanium (Grade 2, Grade 5), Hastelloy C22/C276 | |
| Standards & Certifications | ASME / ANSI | ASME B16.5, ASME B16.47 (Series A & B) |
| ASTM | ASTM A182, ASTM A350 | |
| European Standards | EN 1092-1, DIN 2573, DIN 2576 | |
| Certifications | ISO 9001, PED 2014/68/EU, NACE MR0175, IBR Approved | |
| Design Features | Bore / Hub Design | Precision-bored to match pipe ID for smooth flow |
| Facing Types | RF, FF, RTJ | |
| End Connections | Socket Weld End with standard bore depth & clearance | |
| Tolerance | As per ASME/ANSI standards | |
| Coating & Surface Finish | Anti-Corrosion Coating | Rust Preventive Oil, Black Oxide, Hot-Dip Galvanized |
| Optional Coatings | Epoxy, PTFE, Polyurethane | |
| Surface Finish | Serrated, Smooth, Polished, Passivated | |
| Testing & Inspection | Pressure Testing | Hydrostatic, Pneumatic |
| Non-Destructive Testing | Ultrasonic (UT), Magnetic Particle (MPI), Dye Penetrant (DPT), Radiography (RT) if required | |
| Destructive Testing | Tensile, Hardness, Impact | |
Dimensions (ASME B16.5)
| NPS (inches) | DN (mm) | Outside Diameter (OD, mm) | Flange Thickness (mm) | Raised Face Height (mm) | Hub Bore (Socket Depth, mm) | Bolt Circle Diameter (mm) | Number of Bolts | Bolt Hole Diameter (mm) |
|---|---|---|---|---|---|---|---|---|
| ½” | 15 | 90 | 11 | 1.6 | 3 | 60.3 | 4 | 16 |
| ¾” | 20 | 100 | 12 | 1.6 | 3 | 70 | 4 | 16 |
| 1” | 25 | 110 | 13 | 1.6 | 3 | 79.4 | 4 | 16 |
| 1 ¼” | 32 | 115 | 14 | 1.6 | 4 | 89.1 | 4 | 16 |
| 1 ½” | 40 | 125 | 15 | 1.6 | 4 | 98.4 | 4 | 19 |
| 2” | 50 | 150 | 16 | 1.6 | 4 | 120.6 | 4 | 19 |
| 2 ½” | 65 | 180 | 18 | 1.6 | 5 | 139.7 | 4 | 19 |
| 3” | 80 | 190 | 19 | 1.6 | 5 | 152.4 | 4 | 19 |
| 4” | 100 | 230 | 24 | 1.6 | 5 | 190.5 | 8 | 19 |
| 5” | 125 | 255 | 24 | 1.6 | 6 | 215.9 | 8 | 22 |
| 6” | 150 | 280 | 26 | 1.6 | 6 | 241.3 | 8 | 22 |
| 8” | 200 | 345 | 29 | 1.6 | 7 | 298.5 | 8 | 22 |
| 10” | 250 | 405 | 32 | 1.6 | 7 | 362 | 12 | 25 |
| 12” | 300 | 485 | 35 | 1.6 | 8 | 431.8 | 12 | 25 |
| 14” | 350 | 535 | 37 | 1.6 | 8 | 476.2 | 12 | 29 |
| 16” | 400 | 595 | 40 | 1.6 | 9 | 539.8 | 16 | 29 |
| 18” | 450 | 635 | 42 | 1.6 | 9 | 596.9 | 16 | 32 |
| 20” | 500 | 700 | 45 | 1.6 | 10 | 635 | 20 | 32 |
| 24” | 600 | 815 | 48 | 1.6 | 10 | 749.3 | 20 | 35 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 485 – 760 | MPa (varies with material: CS, SS, Alloy Steel) |
| Yield Strength | 250 – 450 | MPa |
| Hardness | 130 – 220 | HB (Brinell) |
| Elongation | ≥ 20 – 30 | % |
| Density | 7.8 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 27 – 70 | J (Charpy V-notch, depending on grade) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 200 – 400 | MPa |
| Corrosion Resistance | Good to Excellent | SS & Alloy grades offer higher resistance |
| Thermal Conductivity | 15 – 50 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.45 – 0.60 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 130 – 220 | HB |
| Surface Finish | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ); Ra ≤ 3.2 μm | – |
| Operating Temperature Range | -46 to 600 | °C (depending on material) |
| Pressure Rating | Class 150 – 2500 | ASME B16.5 / B16.47 Standards |
Chemical Composition
| Element | SS 304 (%) | SS 304L (%) | SS 316 (%) | SS 316L (%) |
|---|---|---|---|---|
| Carbon (C) | ≤ 0.08 | ≤ 0.03 | ≤ 0.08 | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 |
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 | 10.0 – 14.0 | 10.0 – 14.0 |
| Molybdenum (Mo) | — | — | 2.0 – 3.0 | 2.0 – 3.0 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
Applications of Socket Weld Flanges
Construction &
Infrastructure
Power Generation &
Energy Sector
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What is the major benefit of using socket weld flanges?
Where are socket weld flanges preferred over slip-on flanges?
Can socket weld flanges be used with stainless steel piping?
What are the standard testing methods used for these flanges?
