Stainless Steel Forged Socket Weld Pipe Fittings - ISO Certified Manufacturer & Exporter
SS Socket Weld Fittings are forged high-pressure pipe fittings where the pipe is inserted into a recessed socket area and a fillet weld is applied around the pipe end. This configuration ensures leak-free joints with maximum structural integrity making them the preferred choice for high-pressure process piping.
Amardeep Steel Centre manufactures these fittings using premium austenitic stainless steel bar stock and seamless pipe. Each fitting is forged (not cast), ensuring superior grain structure, higher pressure ratings, and consistent mechanical properties throughout.
Our ASTM A182 Socket Weld Fittings are dimensionally compliant to ANSI B16.11 and are available in Class 3000#, 6000#, and 9000# pressure ratings. For larger bore piping beyond 4 inches, consider our SS Buttweld Fittings range. We supply to refineries, petrochemical plants, power plants, shipbuilding, and pharmaceutical facilities worldwide.
Why Socket Weld vs Threaded?
- No thread leakage risk — full fillet weld seals the joint permanently
- Higher pressure ratings — Class 3000# to 9000# vs threaded Class 2000# max
- Suitable for hazardous media — flammable, toxic, and expensive fluids
- No pipe beveling required — reduces installation time and cost
- Cleaner internal bore — better flow characteristics and reduced turbulence
Available SS Grades for Socket Weld Fittings
We manufacture socket weld fittings across all major austenitic stainless steel grades per ASTM A182. Select your grade based on temperature, corrosion environment, and pressure requirements.
ASTM A182 F304 / F304L — UNS S30400 / S30403
Most widely used grade. Excellent corrosion resistance, high ductility, and weldability. 304L has lower carbon for enhanced resistance to intergranular corrosion after welding.
ASTM A182 F316 / F316L — UNS S31600 / S31603
Contains 2–3% molybdenum for superior resistance to pitting and chloride corrosion. Ideal for marine, pharmaceutical, and chemical processing applications.
ASTM A182 F321 / F321H — UNS S32100
Titanium-stabilised grade for high-temperature service up to 900°C. Used in refineries, power plants, and exhaust systems. 321H has higher carbon for enhanced creep resistance.
ASTM A182 F347 / F347H — UNS S34700
Niobium-stabilised. Excellent for high-temperature and nuclear applications. 347H preferred for boilers and pressure vessels above 550°C.
ASTM A182 F904L — UNS N08904
Super-austenitic grade with high Mo, Ni, and Cu. Exceptional resistance to sulfuric acid, phosphoric acid, and seawater. Used in FGD systems and chemical plants.
ASTM A182 F310S / F317L
310S for extreme heat resistance up to 1100°C in furnace applications. 317L has higher Mo than 316L for superior chloride and sulfuric acid resistance.
Types of SS Socket Weld Pipe Fittings
Complete range of socket weld forged fittings for all piping configurations and branch connections.
Socket Weld Elbow
45° & 90° elbows for direction changes.
Socket Weld Tee
Equal & reducing branch connections.
Socket Weld Cross
Four-way pipe connections.
Socket Weld Couplings
Full & half coupling solutions.
Reducing Coupling
Simple pipe size reduction.
Socket Weld Cap
High-pressure pipe end sealing.
Reducing Insert
Quick pipeline reduction.
Socket Weld Union
Easy dismantling connection.
Sockolet (SW Olet)
Socket weld branch outlet fitting for 90° connections. Available in 3000#, 6000#, 9000#.
Socket Weld Bushing
Reduces socket bore size. Internal thread option available. Sizes 1/4″ to 4″.
Socket Weld Plug
Seals socket ends. Available in bull plug & hex head. Class 3000# and 6000#.
Share your grade, size, class and quantity. Our team responds within 4 business hours.
Socket Weld Fitting Pressure Classes
ANSI B16.11 defines three pressure classes for socket weld fittings. Select based on your system's operating pressure and pipe schedule.
| Pressure Class | Sizes | Schedule | Typical Applications |
|---|---|---|---|
| Class 3000 LBS | 1/8″ – 4″ | SCH 40 / 80 / XS | General high-pressure service, HVAC, instrumentation, oil & gas piping |
| Class 6000 LBS | 1/8″ – 2″ | SCH XXS | Critical process lines, high-pressure hydraulics, chemical injection |
| Class 9000 LBS | 1/8″ – 2″ | SCH XXS Heavy | Extreme pressure applications, HP steam, wellhead equipment |
Stainless Steel Socket Weld Fittings Specification
Full dimensional and material specification for Amardeep Steel's socket weld forged fittings range.
| Parameter | Details |
|---|---|
| Material Standard | ASTM A182 / ASME SA182 |
| Dimensional Standard | ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, MSS SP-97, BS 3799 |
| Grades Available | ★ F304, F304L, F316, F316L, F321, F321H, F347, F347H, F310S, F317L, F904L |
| Size Range | 1/8″ to 4″ (DN6 to DN100) |
| Pressure Class (SW) | 3000 LBS, 6000 LBS, 9000 LBS |
| End Connection | Socket Weld (SW) |
| Form | Seamless Forged |
| Schedule | ★ SCH 40 / 80 / 160 / XXS (class-dependent) |
| End Finish | ★ Plain End, Beveled End |
| Other Standards | BS, DIN, JIS, SAE, IS standards on request |
| Testing | Hydrostatic Test, PMI, Radiography (if specified), Hardness, IGC Test (A262) |
| Mill Test Certificate | ★ EN 10204 / 3.1 (standard), 3.2 (third party on request) |
| Inspection | ★ EN 10204 3.1 / 3.2 MTC available on request |
| Surface Finish | Pickled & Passivated, Electro-polished (on request) |
| Marking | Grade, Size, Class, Heat No., Manufacturer's Logo |
| Packaging | ★ Wooden cases, carton boxes, wooden pallets |
Socket Weld vs Threaded vs Buttweld Fittings — How to Choose
Choosing the right fitting type depends on pressure class, pipe size, and application. Here is how socket weld fittings compare to alternatives.
| Feature | Socket Weld (SW) | Threaded | Buttweld (BW) |
|---|---|---|---|
| Size Range | 1/8″ – 4″ | 1/8″ – 4″ | 1/2″ – 48″ |
| Pressure Rating | Up to 9000 LBS | Up to 6000 LBS | Full bore, all schedules |
| Leak Resistance | ✓ Excellent (fillet weld) | Moderate (thread seal) | ✓ Best (full weld) |
| Pipe Beveling | ✓ Not required | ✓ Not required | Required |
| Radiography | Not applicable | Not applicable | ✓ Full radiography possible |
| Hazardous Media | ✓ Suitable | Not recommended | ✓ Fully suitable |
| Cost vs BW | Higher material, lower install | Lower overall | Lower material, higher install |
For high-purity or corrosive services where crevice corrosion is a concern, our engineering team can advise on the most suitable connection type. For large-bore applications above 4″, see our SS Buttweld Fittings range.
SS Socket Weld Fittings — Industry Applications
Our high-pressure forged socket weld fittings are supplied to over 40 countries across critical industries.
- Oil & Gas Refineries
- Petrochemical Plants
- Power Generation
- Pharmaceutical
- Food & Beverage Processing
- Offshore & Marine
- Chemical Processing
- Nuclear Power
- Shipbuilding & Defence
- Pulp & Paper Industry
- Cryogenic Applications
- Hydraulic & Instrumentation
SS Socket Weld Fittings Weight Chart (ASME B16.11)
| NPS | 90° Elbow 3000# (kg) | Equal Tee 3000# (kg) | Half Coupling 3000# (kg) | Cap 3000# (kg) |
|---|---|---|---|---|
| 3/8″ | 0.09 | 0.12 | 0.05 | 0.05 |
| 1/2″ | 0.15 | 0.20 | 0.09 | 0.09 |
| 3/4″ | 0.24 | 0.33 | 0.14 | 0.14 |
| 1″ | 0.38 | 0.53 | 0.22 | 0.22 |
| 1-1/4″ | 0.60 | 0.84 | 0.36 | 0.36 |
| 1-1/2″ | 0.96 | 1.35 | 0.57 | 0.57 |
| 2″ | 1.54 | 2.16 | 0.92 | 0.92 |
| 3″ | 3.93 | 5.50 | — | — |
| 4″ | 6.29 | 8.80 | — | — |
Note: Weights are nominal per ASME B16.11. Actual weight varies by grade and heat number. Contact us for certified mill weights with your order.
SS Socket Weld Fittings Dimensions (ASME B16.11)
| NPS | Socket Depth (C) | Socket Bore Ø (B) 3000# | Socket Bore Ø (B) 6000# | Wall 3000# (in) | Wall 6000# (in) | C-B 3000# | C-B 6000# |
|---|---|---|---|---|---|---|---|
| 1/8″ | 3/8 min | 0.425 | 0.540 | 0.125 | 0.095 | 7/16 | 7/16 |
| 1/4″ | 3/8 min | 0.560 | 0.675 | 0.130 | 0.119 | 7/16 | 17/32 |
| 3/8″ | 3/8 min | 0.700 | 0.840 | 0.145 | 0.126 | 1/2 | 19/32 |
| 1/2″ | 3/8 min | 0.860 | 1.050 | 0.161 | 0.147 | 5/8 | 3/4 |
| 3/4″ | 3/8 min | 1.075 | 1.315 | 0.178 | 0.154 | 3/4 | 7/8 |
| 1″ | 1/2 min | 1.335 | 1.660 | 0.196 | 0.179 | 7/8 | 1-1/16 |
| 1-1/4″ | 1/2 min | 1.705 | 1.900 | 0.210 | 0.191 | 1 | 1-3/16 |
| 1-1/2″ | 1/2 min | 1.920 | 2.375 | 0.218 | 0.200 | 1-1/4 | 1-1/2 |
| 2″ | 5/8 min | 2.410 | 2.875 | 0.238 | 0.218 | 1-1/2 | 1-5/8 |
| 3″ | 5/8 min | 3.545 | 3.500 | 0.327 | 0.300 | 2-1/4 | — |
| 4″ | 3/4 min | 4.550 | 4.500 | 0.368 | 0.337 | 2-5/8 | — |
Note: All dimensions in inches. C-B = Centre-to-Bottom. Sourced from ASME B16.11 published dimensional data. For class 9000# dimensions, contact our technical team.
Pressure-Temperature Rating — SS Socket Weld Fittings (ASTM A182 F304)
| Temperature | Class 3000# (A182 F304) psi | Class 6000# (A182 F304) psi |
|---|---|---|
| 100°F | 2570 | 5145 |
| 200°F | 2280 | 4565 |
| 300°F | 2055 | 4115 |
| 400°F | 1870 | 3745 |
| 500°F | 1715 | 3430 |
| 600°F | 1600 | 3200 |
| 700°F | 1480 | 2960 |
| 800°F | 1370 | 2745 |
| 900°F | 1290 | 2580 |
| 1000°F | 1250 | 2500 |
Source: Per ASME B16.11 and ASTM A182 published pressure-temperature ratings. Ratings shown are for Class 3000# and 6000# in ASTM A182 F304 grade. F316 and F316L ratings are similar; F321H and F347H may be higher at elevated temperatures — contact us for service-specific ratings.
Frequently Asked Questions — SS Socket Weld Fittings
What is the difference between Class 3000# and Class 6000# socket weld fittings?
Class 3000# (3000 LBS) socket weld fittings are designed for moderate high-pressure service and are available in sizes 1/8″ to 4″. Class 6000# fittings have heavier walls and are rated for higher pressure, available up to 2″ in size. Class 9000# is available for extreme-pressure applications. The class determines wall thickness and bore geometry as per ANSI B16.11.
What ASTM standard governs SS socket weld fittings?
Stainless steel socket weld fittings are covered by ASTM A182 / ASME SA182 for material and mechanical properties and dimensionally by ASME B16.11. MSS SP-83 covers Class 3000# and 6000# unions, while BS 3799 applies for petroleum industry service. All fittings carry EN 10204 / 3.1 test certificates as standard.
Which grade is recommended for high-temperature socket weld applications?
For service temperatures above 550°C, SS 321H (ASTM A182 F321H) or SS 347H (F347H) are recommended. 321H contains titanium stabilisation that prevents carbide precipitation, while 347H uses niobium for enhanced creep strength. Both grades are widely used in refinery heaters, power plant steam lines, and petrochemical reactors.
Can socket weld fittings be used with seamless pipe?
Yes. Socket weld fittings are compatible with both seamless and welded pipe provided the pipe OD matches socket bore dimensions per ANSI B16.11. Seamless pipe combined with socket weld fittings is preferred in critical high-pressure applications such as chemical injection and HP steam lines.
Do you provide third-party inspection for socket weld fittings?
Yes. Third-party inspection is accepted from Bureau Veritas, TÜV, Lloyd's Register, SGS, and TPIA. Documentation includes radiography reports, PMI certificates, hydrostatic test reports, and EN 10204 / 3.2 MTC upon request.
Get a Quote for SS Socket Weld Fittings
Share your grade, size, class, and quantity. Our team will respond within 4 business hours with pricing and availability.
