Description
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
-
Non-standard sizes – any diameter, any wall
-
Special materials – duplex 2205, super duplex 2507, Inconel, Monel, Hastelloy
-
Special facings – tongue & groove, male-female, lens ring
-
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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