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 Construction – Ideal for high-pressure and high-temperature systems.
- Smooth Bore – Reduces turbulence and improves flow efficiency.
- High Mechanical Strength – Offers better fatigue resistance than threaded flanges.
- Suitable for Small-Diameter Piping – Generally used for pipes below 2” NPS.
- Code Compliant – Manufactured as per ASME B16.5, ASTM A105, A182, etc.
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Details |
|---|---|
| Sizes | ½” to 24” (DN15–DN600) |
| Pressure Ratings | Class 150, 300, 600, 900 |
| Material Grades | CS A105, SS 304, 316, 321, Duplex Steel |
| Standards | ASME B16.5, EN 1092-1, BS 4504, ISO |
| Connection | Socket Weld |
| Face Type | RF, RTJ, FF |
| Property | Value |
|---|---|
| Tensile Strength | 485 – 700 MPa |
| Yield Strength | 250 – 450 MPa |
| Elongation | 20% – 30% |
| Hardness | 120 – 250 HB |
| Temperature Range | -46°C to +600°C |
| Element | Composition (%) |
|---|---|
| Carbon | 0.08 – 0.30 |
| Manganese | 0.50 – 1.50 |
| Silicon | 0.15 – 0.75 |
| Chromium | 17.0 – 20.0 (SS) |
| Nickel | 8.0 – 12.0 (SS) |
| Molybdenum | 2.0 – 3.0 (for 316) |
| Sulfur | ≤ 0.030 |
| Phosphorus | ≤ 0.040 |
| Iron | Balance |
| Standard | Equivalent Grade |
|---|---|
| ASTM | A105, A182 F304/F316 |
| ASME | B16.5 |
| DIN | 1.4301 / 1.4401 / 1.5415 |
| EN | X5CrNi18-10 / X5CrNiMo17-12-2 |
| JIS | SUS 304 / SUS 316 |
| Flange Size (inches) | Pressure Class | Approx. Weight (kg/pc) |
|---|---|---|
| 1” | 150# | 2.90 |
| 2” | 300# | 7.50 |
| 4” | 600# | 18.80 |
| 6” | 600# | 29.40 |
| 8” | 900# | 45.20 |
Applications of Socket Weld Flanges
Construction &
Infrastructure
Automotive & Heavy
Equipment
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?
They offer superior leak-proof performance and smoother internal fluid flow.
Where are socket weld flanges preferred over slip-on flanges?
In high-pressure systems with smaller diameters (generally below 2”), socket weld flanges are preferred for their strength.
Can socket weld flanges be used with stainless steel piping?
Yes, they are available in stainless steel grades like 304, 316, and Duplex.
What are the standard testing methods used for these flanges?
Hydrostatic testing, PMI testing, and dimensional inspection are commonly applied before dispatch.
