Description
Product Detail
Steel socket weld flanges are forged flanges with a socket recess that allows pipe insertion before fillet welding, providing good alignment and strong performance in high-pressure, moderate-temperature service. They are commonly selected for small-diameter process lines, steam systems, hydraulic lines, chemical plants, offshore platforms and power generation piping where compact installation and dependable sealing are important.
SASA FLANGE supplies socket weld flanges in standard and customized dimensions according to ASME B16.5, EN 1092-1, DIN, JIS and GB requirements. Each batch can be supported with chemical analysis, mechanical testing, dimensional inspection, PMI testing, sealing face verification, EN 10204 3.1 certificate and full heat number traceability to meet international project and end-user quality requirements.
- ✓Product Name: Steel Socket Weld Flange
- ✓Material Grade: ASTM A105, A182 F304/F316, F11/F22, LF2, F51
- ✓Product Type: Forged socket weld flange
- ✓Main Feature: Accurate pipe alignment, compact design, suitable for high-pressure small-bore service
- ✓Applications: Oil and gas, petrochemical, steam lines, power plants, marine piping and water treatment
Product Parameters
| Product Name | Steel Socket Weld Flange |
| Material Grade | ASTM A105, A350 LF2, A182 F304/F304L, F316/F316L, F321, F11, F22, F51, F53 |
| Material Type | Carbon steel, stainless steel, alloy steel, duplex stainless steel |
| Product Form | Forged and machined flange |
| Size Range | DN15 – DN600 (1/2 inch – 24 inch) |
| Pressure Class | Class 150 – 2500 / PN10 – PN100 |
| Sealing Face | RF, FF, RTJ |
| Surface Treatment | Anti-rust oil, black painting, varnish, galvanized, passivation |
| Standard | ASME B16.5, EN 1092-1, DIN, JIS B2220, GB/T 9119 or customer specification |
| Inspection | Chemical Analysis, Mechanical Test, PMI Test, Dimensional, Hydrostatic |
| Certificate | EN 10204 3.1 Material Certificate available |
| Processing Service | Cutting, CNC Machining, Custom Drilling, Custom Size Processing |
Chemical Composition
Chemical composition values below are for general reference based on common forged flange grades. The final chemistry depends on the selected material standard, heat number and project specification. Actual values are confirmed by mill test certificate and verified when required through laboratory analysis and PMI inspection before shipment.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| ASTM A105 % | 0.35 max | 0.35 max | 0.60-1.05 | 0.035 max | 0.040 max | 0.30 max | 0.40 max | 0.12 max | Cu 0.40 max |
Mechanical Properties
Mechanical properties shown are typical minimum values for commonly supplied forged flange materials. Actual performance may vary according to grade, wall thickness, heat treatment condition and applicable standard. Final inspection data is issued against the specific heat and material certificate supplied with the flange order.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| ASTM A105 | 485 MPa min | 250 MPa min | 22% min | 187 HB max | 7.85 g/cm3 |
| ASTM A182 F316/F316L | 515 MPa min | 205 MPa min | 30% min | 217 HB max | 7.98 g/cm3 |
Common Size Table
| Size Range | Pressure Class | Sealing Face | Material | Availability |
|---|---|---|---|---|
| DN15 – DN50 | Class 150 – 600 | RF | A105, F304/F316 | Stock / Production |
| DN65 – DN300 | Class 150 – 1500 | RF / RTJ | A105, LF2, F11, F22, F304/F316 | Stock / Production |
| DN350 – DN600 | Class 150 – 2500 | RF / RTJ | A105, F11, F22, F51 | Production |
| DN15 – DN100 | PN10 – PN100 | RF / FF | Carbon Steel, Stainless Steel | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| Socket Weld Flange | Flange with socket bore for pipe insertion and fillet weld connection | Small-bore high-pressure piping and process lines |
| Weld Neck Flange | Flange with tapered hub for butt-weld connection and smooth stress transition | Critical service, cyclic loading and larger pipe sizes |
| Slip On Flange | Flange slipped over pipe and welded at two locations | Low to moderate pressure utility and process systems |
| Threaded Flange | Flange with internal thread, no welding required on pipe bore | Low-pressure systems and hazardous areas where hot work is limited |
Equivalent Standards and International Names
Socket weld flanges are mainly standardized in ASME systems for forged steel piping. Equivalent project references may also involve EN, DIN, JIS and GB flange dimensions or related material grades. Grade naming differs by region, so material equivalency should always be confirmed against pressure rating, chemistry, mechanical properties and service conditions.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 | ASTM A105, A182 F304/F316, A350 LF2 |
| Europe | EN 1092-1 | P245GH, 1.4301, 1.4404 |
| Germany | DIN 2526 / DIN EN 1092-1 | C22.8, 1.4301, 1.4571 |
| Japan | JIS B2220 | SFVC2A, SUS304, SUS316 |
| China | GB/T 9119 | 20#, 16Mn, 06Cr19Ni10, 022Cr17Ni12Mo2 |
Production Process Flow
SASA FLANGE controls each production stage from raw material procurement to final packing. Process parameters, dimensional tolerances and material traceability are monitored to ensure socket weld flanges meet project drawings, pressure classes and international flange standards.
- 1. Raw Material Selection
- 2. Forging / Cutting
- 3. Heat Treatment
- 4. Rough Machining
- 5. Finish Machining
- 6. Drilling
- 7. Surface Treatment
- 8. Inspection
- 9. Marking
- 10. Packing
- 11. Delivery
| Process Step | Description | Quality Control Point |
|---|---|---|
| Raw Material | Select certified forging billets or plates | Material certificate and traceability |
| Forging | Hot forging to achieve required shape | Forging temperature and reduction ratio |
| Heat Treatment | Normalizing, tempering or annealing | Temperature and holding time control |
| Machining | Sealing face, bolt holes, dimensions | Dimensional accuracy and surface finish |
| Inspection | Final inspection before shipment | Dimension, surface, PMI, hydrostatic |
Product Inspection
1. Chemical Composition Inspection
Chemical composition inspection is carried out to confirm that the flange material matches the required grade such as A105, F316 or F22. Test results are checked against the applicable ASTM or EN standard limits for carbon, manganese, chromium, nickel, molybdenum and other elements to ensure material compliance before release.
2. Mechanical Properties Testing
Mechanical testing verifies tensile strength, yield strength, elongation and hardness according to the selected material specification. These tests confirm that forged socket weld flanges have the required strength and ductility for pressure service. Heat treatment records are also reviewed to ensure the material condition is suitable for the intended operating temperature.
3. Dimensional Inspection
Dimensional inspection covers outside diameter, thickness, hub dimensions, socket bore, bolt circle, hole quantity, hole diameter and facing details. The raised face or ring joint profile is checked for accuracy and finish. This ensures proper fit-up with mating flanges, correct pipe insertion depth and reliable sealing performance during installation.
4. PMI Testing and Hydrostatic Testing
PMI testing is available to positively identify alloy and stainless steel materials and prevent mixed-grade supply. When specified, hydrostatic or pressure-related verification is performed in accordance with project requirements. SASA FLANGE supplies EN 10204 3.1 material certificate, inspection reports and traceable heat numbers for complete quality documentation.
Product Packaging
- ✓Wooden Case Packaging: Suitable for high-pressure and large-diameter products
- ✓Pallet Packing with Shrink Wrap: Suitable for batch shipments and standard sizes
- ✓Anti-rust Oil Coating + Waterproof Paper: Used for ocean freight protection
- ✓Individual Plastic Bag + Carton: Used for small fittings and threaded products
- ✓Clear Marking: Grade, size, pressure class, heat number and PO number
Applications
Steel socket weld flanges are widely used in compact piping systems where dependable sealing, pressure resistance and good alignment are required. They are especially common in small-diameter process lines, utility piping and critical services across energy, chemical and marine sectors where vibration resistance and installation reliability are important.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Instrument lines, hydraulic systems, high-pressure process piping, utility headers | Provides strong forged construction and secure connection for small-bore pressure service |
| Chemical Processing | Corrosive media lines, dosing systems, reactor auxiliary piping | Available in stainless and alloy grades with reliable sealing faces |
| Power Generation | Steam lines, boiler auxiliary piping, condensate and feedwater systems | Suitable for high-pressure service and compact piping layouts |
| Water Treatment | Chemical injection, pump discharge lines, skid-mounted treatment systems | Compact design and easy alignment support efficient installation |
| Marine and Offshore | Deck piping, utility systems, seawater treatment skids, module piping | Forged strength and optional corrosion-resistant materials suit demanding environments |
Why Choose SASA FLANGE?
- ✓Professional manufacturer of Weld Neck Flange for global industrial projects
- ✓Customized size, pressure class and material grade according to drawings
- ✓Full standard support: ASME, EN, DIN, JIS, GB, GOST and customer specifications
- ✓Material traceability with heat number control and EN 10204 3.1 material certificate
- ✓Chemical analysis, mechanical testing, PMI testing, hydrostatic and dimensional inspection
- ✓Stock availability for standard items, lead time 3-7 days; custom production 15-30 days
- ✓Export-grade packaging for sea, air and land transportation
- ✓15+ years experience supplying 50+ countries worldwide
FAQ
Q: What is a steel socket weld flange?
A: A steel socket weld flange is a forged flange with a recessed socket where the pipe is inserted before fillet welding around the outside. It is mainly used for small-diameter, high-pressure piping. This design helps provide good alignment during assembly and is commonly selected for steam, hydraulic, chemical and process service.
Q: What materials are available for steel socket weld flanges?
A: SASA FLANGE supplies socket weld flanges in carbon steel, low-temperature carbon steel, stainless steel, alloy steel and duplex grades. Common materials include ASTM A105, A350 LF2, A182 F304/F304L, F316/F316L, F11, F22 and F51. Material selection depends on temperature, corrosion resistance, pressure class and the project specification.
Q: What pressure class is supported?
A: Steel socket weld flanges are commonly available in ASME Class 150, 300, 600, 900, 1500 and 2500, depending on size and material. For metric projects, equivalent PN ratings can be produced according to customer requirements. The correct pressure class should be selected based on design pressure, temperature and the applicable piping code.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can produce custom socket weld flanges according to drawings or project specifications, including special drilling patterns, non-standard thickness, sealing face machining, NACE service materials and special markings. Custom machining for RF, FF or RTJ faces and special material grades is available for OEM, EPC and maintenance projects.
Q: What certificate is provided?
A: SASA FLANGE can provide EN 10204 3.1 material certificate, mill test certificate, dimensional inspection reports and mechanical and chemical test results. PMI testing reports are available for alloy and stainless steel materials, and hydrostatic or additional NDT documentation can be arranged when required by the order or end-user specification.
Contact Us
If you are looking for stee socket weld or related custom flange products, please contact SASA FLANGE with your required size, pressure class, material grade, standard, surface treatment, quantity and inspection requirements. Our team will provide professional technical solutions and competitive quotation within 24 hours.
- 📧 Email: sales@sasaflange.com
- 📱 WhatsApp: +86 13764965049
- ☎️ Tel: +86 21 52236361
- 🌐 Website: www.sasaflange.com
