Steel Pipe Flanges – ASME B16.5, EN 1092-1, DIN, BS 4504-Carbon, Stainless & Alloy
Flange is used to connect pipes with each other, to valves, to fittings, and to specialty items such as strainers and pressure vessels.
Steel Pipe Flanges – ASME B16.5, EN 1092-1, DIN, BS 4504
Carbon Steel, Stainless Steel & Alloy – Weld Neck, Slip On, Blind, Socket Weld, Threaded
Quick Select by Material
| → Carbon Steel Flanges | → Stainless Steel Flanges | → Alloy Steel Flanges | → Custom Flanges |
|---|---|---|---|
| A105, A350 LF2 | F304/L, F316/L | F11, F22, F91 | Made to drawing |
| General service, oil & gas, low-temp | Food, chemical, marine, pharmaceutical | High-temp, power, refinery | Any size, any material |
Quick Select by Type
| Weld Neck | Slip On | Blind | Socket Weld | Threaded | Lap Joint |
|---|---|---|---|---|---|
| Tapered hub, high-pressure | Easy alignment, cost-effective | For vessel closures | Small bore, high-pressure | No welding needed | With stub ends |
Quick Select by Standard
| ASME B16.5 | EN 1092-1 / DIN | BS 4504 |
|---|---|---|
| Class 150–2500, ½"–24" | PN 2.5–400, DN 10–4000 | PN 2.5–40, legacy UK |
Flanges by Material
Carbon Steel Flanges – A105, A350 LF2
| Grade | Temperature Range | Typical Applications | Available Types |
|---|---|---|---|
| A105 | -29°C to 427°C | General service, oil & gas, water | WN, SO, Blind, Socket, Threaded |
| A350 LF2 | -46°C | Cryogenic, LNG, cold climate | WN, Blind |
Pressure Classes: 150, 300, 400, 600, 900, 1500, 2500 (ASME) / PN 2.5–400 (EN)
Stainless Steel Flanges – F304/L, F316/L
| Grade | Temperature Range | Typical Applications | Available Types |
|---|---|---|---|
| F304/304L | -196°C to 815°C | Food, beverage, pharmaceutical, chemical | WN, SO, Blind, Lap Joint |
| F316/316L | -196°C to 815°C | Marine, high-chloride, pharmaceutical | WN, SO, Blind, Lap Joint |
Pressure Classes: 150, 300, 400, 600, 900, 1500 (ASME) / PN 2.5–400 (EN)
Alloy Steel Flanges – F11, F22, F91
| Grade | Temperature Range | Typical Applications | Available Types |
|---|---|---|---|
| F11 | Up to 590°C | High-temperature process, refineries | WN |
| F22 | Up to 590°C | Hydrocracker, reformer | WN |
| F91 | Up to 650°C | Power generation, supercritical | WN |
Pressure Classes: 300–2500 (ASME) / PN 16–400 (EN)
Custom Flanges – Made to Drawing
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Non-standard sizes – any diameter, any wall
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Special materials – duplex 2205, super duplex 2507, Inconel, Monel, Hastelloy
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Special facings – tongue & groove, male-female, lens ring
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High-pressure designs – up to Class 4500
Flange Types – Complete Guide
| Type | Description | Best Applications | Pressure Range |
|---|---|---|---|
| Weld Neck | Tapered hub, butt weld connection | High-pressure, severe service, cyclic loading | Class 150–2500, PN 10–400 |
| Slip On | Slides over pipe, two fillet welds | General service, cost-effective | Class 150–600, PN 6–40 |
| Blind | Solid plate, no bore | Sealing pipe ends, vessel closures | Class 150–2500, PN 6–400 |
| Socket Weld | Pipe inserts into socket, fillet weld | Small bore, high-pressure | Class 150–1500, PN 40–160 |
| Threaded | Female threads, no welding | Low-pressure, field connections | Class 150–300, PN 6–40 |
| Lap Joint | Used with stub end, loose backing flange | Systems needing frequent dismantling | Class 150–600, PN 6–40 |
Flanges by Standard
ASME B16.5 Flanges
| Parameter | Range |
|---|---|
| Size | ½" – 24" (NPS) |
| Pressure Class | 150, 300, 400, 600, 900, 1500, 2500 |
| Facing | Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF) |
| Materials | A105, A350 LF2, F304/L, F316/L, F11, F22, F91 |
EN 1092-1 / DIN Flanges
| Parameter | Range |
|---|---|
| Size | DN 10 – DN 4000 |
| Pressure PN | 2.5, 6, 10, 16, 25, 40, 63, 100, 160, 250, 400 |
| Facing | Type A (flat), Type B (raised), Type C (tongue), Type D (groove) |
| Materials | P250GH, P285NH, 1.4301, 1.4401, 1.5419, 1.7380 |
BS 4504 Flanges
| Parameter | Range |
|---|---|
| Size | DN 10 – DN 4000 |
| Pressure PN | 2.5, 6, 10, 16, 25, 40 |
| Materials | Carbon steel equivalents to A105 |
Pressure Ratings by Material
| Material | Class 150 | Class 300 | Class 600 | Class 900 | Class 1500 | Class 2500 |
|---|---|---|---|---|---|---|
| A105 | 285 psi | 740 psi | 1480 psi | 2220 psi | 3705 psi | 6170 psi |
| F304 | 275 psi | 720 psi | 1440 psi | 2160 psi | 3600 psi | – |
| F316 | 275 psi | 720 psi | 1440 psi | 2160 psi | 3600 psi | – |
| F11 | – | 720 psi | 1440 psi | 2160 psi | 3600 psi | 6000 psi |
Ratings at 100°F (38°C). Derate at higher temperatures.
Flange Faces
| Face Type | Finish | Gasket | Application |
|---|---|---|---|
| Raised Face (RF) | Serrated | Flat ring | General service, Class 150–1500 |
| Ring Type Joint (RTJ) | Smooth groove | Metal ring | High-pressure, high-temperature, Class 600–2500 |
| Flat Face (FF) | Smooth | Full face | Cast iron equipment, low-pressure |
Quality Assurance
✅ EN 10204 3.1 Mill Test Report – heat-specific chemistry, mechanicals
✅ Dimensional inspection – per ASME B16.5 / EN 1092-1
✅ Marking – ASTM/EN grade, class/PN, size, heat number
✅ PMI (Positive Material Identification) – 100% on critical grades
✅ NDT – Ultrasonic, magnetic particle, dye penetrant upon request
✅ Third-party inspection – SGS, BV, LR, DNV, TÜV – no surcharge
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