Excellent Overseas is a trusted manufacturer, stockist and exporter of Forged Pipe Flanges to ASME B16.5, B16.47, EN 1092-1 and DIN, supplied with EN 10204 3.1 / 3.2 certification, full heat-number traceability and third-party inspection on request.
Table of Content
- Flanges Supply Range
- Material Grades
- Types of Flanges
- Flanges at a Glance
- Pressure Rating by Class
- Flange Standards
- DIN & EN Flange Standards
- Chemical & Mechanical Properties
- Bolting Chart
- Flange Thickness Tolerance
- Flange Face Types & Finish
- Gaskets, Threads & Welding
- Flange Markings
- Testing & Certificates
- How to Choose a Flange
- Applications
- Countries We Export To
Pipe Flanges Supply Range
Flanges Material Grades
| Material | Specification & Grades |
|---|---|
| Carbon Steel | ASTM A105 / A105N / ASME SA105, ASTM A181 |
| Low Temperature Carbon Steel | ASTM A350 / ASME SA350 LF2 Class 1 & 2, LF3 |
| High Yield Carbon Steel | ASTM A694 F42 / F46 / F52 / F56 / F60 / F65 / F70 |
| Stainless Steel | ASTM A182 / ASME SA182 F304 / F304L / F304H / F316 / F316L / F316Ti / F317L / F321 / F347 / F310 / F904L |
| Duplex & Super Duplex | ASTM A182 F51 (UNS S31803) / F60 (S32205) / F53 (S32750) / F55 (S32760) |
| Alloy Steel | ASTM A182 / ASME SA182 F1 / F5 / F9 / F11 / F12 / F22 / F91 |
| Nickel Alloys | ASTM B564 – Inconel 600 / 625, Incoloy 800 / 825, Monel 400, Hastelloy C276; ASTM B462 Alloy 20 |
| Copper Alloys | Copper Nickel 90/10, 70/30 |
Types of Flanges
Buy every type of flange from a flange manufacturer in India at factory price.
ASME B16.5 Standard Flanges
Weld Neck Flange
Tapered hub, butt welded
Slip On Flange
Pipe slides in, fillet welded
Blind Flange
Closes pipe end
Socket Weld Flange
Small bore, high pressure
Threaded Flange
No welding required
Lap Joint Flange
Used with stub end
Special & Custom Flanges
Plate Flange
Flat, low pressure
Orifice Flange
ASME B16.36, with pressure taps
Reducing Flange
Changes line size
Spectacle Blind
ASME B16.48 line blank
Puddle Flange
Cast into concrete walls
Stub End Flange
Lap joint + stub end set
Raised Face Flange
Most common face type
Forged Flange
Forged & machined
Exhaust Flange
Engine & exhaust lines
Pipe Flanges at a Glance
Flange Types
- Weld Neck
- Blind
- Slip On
- Socket Weld
ASME B16.5 Flange Sizes
- NPS: 1/2" to 24" (B16.5)
- NPS: 26" to 60" (B16.47)
- Class: 150 to 2500#
- Custom Size Available
Flange Material
- Carbon Steel
- Stainless Steel
- Alloy Steel
- Nickel Alloy
Flange Advantages
- Low Maintenance
- High Tensile Strength
- Excellent Corrosion Resistance
- Easy Dismantling
Supporting Material
- Gaskets
- Stud Bolts & Nuts
- Ring Joint Gaskets
Flange Faces
- RF – Raised Face
- FF – Flat Face
- RTJ – Ring Type Joint
- T&G – Tongue & Groove
Face Finish
- Spiral / Concentric Serrated
- Serrated (Stock)
- Smooth
- Mirror
Flange Origin
- Indian
- European
- Korean
- Japanese
Flange Threads
- NPT
- BSPT
- BSPP
- FNPT / MNPT
Manufacturing Process
- Cutting
- Forging
- Ring Rolling
- CNC Machining
Testing Facility
- PMI Testing
- NDT (UT / MPI)
- Hydro Test
Test Certificates
- Raw Material Certificate
- EN 10204 3.1 / 3.2
- Third Party Inspection Report
- NDT Reports
ASME B16.5 Flange Pressure Rating by Class
Maximum working pressure for ASTM A105 (Material Group 1.1) at -29°C to 38°C, and the hydrostatic shell test pressure.
| Class | Working Pressure (bar) | Working Pressure (psi) | Hydro Shell Test (psig) |
|---|---|---|---|
| 150 | 19.6 | 285 | 450 |
| 300 | 51.1 | 740 | 1,125 |
| 400 | 68.1 | 990 | 1,500 |
| 600 | 102.1 | 1,480 | 2,225 |
| 900 | 153.2 | 2,220 | 3,350 |
| 1500 | 255.3 | 3,705 | 5,575 |
| 2500 | 425.5 | 6,170 | 9,275 |
Allowable pressure falls as temperature rises and differs by material group – refer to the ASME B16.5 pressure–temperature tables for your design condition.
Industrial Pipe Flange Standards
Check a flange stockist in India offering high-quality products that meet international standards.
| Standard | Covers |
|---|---|
| ASME / ANSI B16.5 | Pipe flanges NPS 1/2" to 24", Class 150 to 2500 |
| ASME B16.47 Series A | Large diameter flanges NPS 26" to 60" (formerly MSS SP-44) |
| ASME B16.47 Series B | Large diameter flanges NPS 26" to 60" (formerly API 605) |
| ASME B16.36 | Orifice flanges, Class 300 to 2500 |
| ASME B16.48 | Line blanks – spectacle blinds, spades and spacers |
| MSS SP-44 | Steel pipeline flanges |
| EN 1092-1 | European steel flanges, PN designated |
| DIN Flanges | DIN 2527, 2576, 2631 – 2638, 2642 and others |
| ISO 7005-1 | International steel flanges |
| BS 4504 / BS 10 / BS 1560-3.1 | British Standard flanges |
| JIS B2220 | Japanese steel flanges, 5K to 30K |
| GOST 33259 / GOST 12820 | Russian standard flanges |
DIN Standard for Flanges
| Standard | Pressure | Type |
|---|---|---|
| DIN 2527 | PN6, PN10, PN16, PN25, PN40, PN64, PN100 | Blind (BL) Flange |
| DIN 2576 | PN10 | Plate (Welding) Flange |
| DIN 2632 | PN10 | Welding Neck (WN) Flange |
| DIN 2633 | PN16 | Welding Neck (WN) Flange |
| DIN 2634 | PN25 | Welding Neck (WN) Flange |
| DIN 2635 | PN40 | Welding Neck (WN) Flange |
| DIN 2642 | PN10 | Loose (Lapped Joint) Flange |
| DIN 2561 | PN10, PN16 | Oval Threaded Flange |
EN 1092-1 Flange Types
| EN Standard | Size | Type |
|---|---|---|
| EN 1092-1 Type 01 | DN10 to DN4000 | Plate Flange for Welding (PL) |
| EN 1092-1 Type 02 | DN10 to DN1400 | Loose Plate Flange |
| EN 1092-1 Type 05 | DN10 to DN4000 | Blind Flange (BL) |
| EN 1092-1 Type 11 | DN10 to DN4000 | Weld Neck Flange (WN) |
| EN 1092-1 Type 12 | DN10 to DN600 | Hubbed Slip On Flange (SO) |
| EN 1092-1 Type 13 | DN10 to DN150 | Hubbed Threaded Flange (TH) |
Available size range depends on the PN rating. EN 1092-1 covers steel flanges; EN 1092-2 covers cast iron flanges.
Excellent Overseas is a Reliable Flange Stockist With Ready Inventory.
WN, SO, Blind, SW and special flanges in CS, SS, AS, Duplex and Nickel Alloys. Request stock list, price and full documentation.
Quote NowASTM A105 Flange Chemical Composition
Si 0.10 – 0.35%. Refer to the mill test certificate for actual heat chemistry.
Mechanical Properties of Flanges
| Grade | Tensile Strength min, ksi (MPa) | Yield Strength min, ksi (MPa) | Elongation min |
|---|---|---|---|
| A105 | 70 (485) | 36 (250) | 22% |
| A350 LF2 Cl.1 | 70 – 95 (485 – 655) | 36 (250) | 22% |
| A182 F304 / F316 | 75 (515) | 30 (205) | 30% |
| A182 F304L / F316L | 70 (485) | 25 (170) | 30% |
| A182 F51 Duplex | 90 (620) | 65 (450) | 25% |
| A182 F11 Cl.2 | 70 (485) | 40 (275) | 20% |
| A182 F22 Cl.3 | 75 (515) | 45 (310) | 20% |
| A182 F91 | 85 (585) | 60 (415) | 20% |
Elongation on 4D round specimen. A105 hardness 137 – 187 HBW. A350 LF2 is impact tested at -46°C.
Flange Bolting Chart – NPS 4" by Class
Bolt count and bolt size change with both flange size and pressure class. Example for a 4" ASME B16.5 flange (dimensions in inches):
| Class | Flange OD | Bolt Circle Dia. | No. of Bolts | Bolt Diameter |
|---|---|---|---|---|
| 150 | 9.00 | 7.50 | 8 | 5/8" (15.9 mm) |
| 300 | 10.00 | 7.88 | 8 | 3/4" (19.1 mm) |
| 400 | 10.00 | 7.88 | 8 | 7/8" (22.2 mm) |
| 600 | 10.75 | 8.50 | 8 | 7/8" (22.2 mm) |
| 900 | 11.50 | 9.25 | 8 | 1 1/8" (28.6 mm) |
| 1500 | 12.25 | 9.50 | 8 | 1 1/4" (31.8 mm) |
| 2500 | 14.00 | 10.75 | 8 | 1 1/2" (38.1 mm) |
Bolt hole diameter is 1/8" larger than the bolt diameter. Full bolting charts for all sizes available on request.
Flange Thickness Tolerance
| Flange Thickness tf (mm) | Tolerance (mm) |
|---|---|
| tf ≤ 25 | +3.0 / -0.0 |
| 25 < tf ≤ 50 | +5.0 / -0.0 |
| 50 < tf ≤ 75 | +8.0 / -0.0 |
| tf > 75 | +10.0 / -0.0 |
Flange Face Types
As flange manufacturers in India, we offer every standard face type.
RF – Raised Face
Most common face. 1/16" raised for Class 150 & 300, 1/4" for Class 400 and above.
FF – Flat Face
Full-face gasket; used with cast iron valves, pumps and low-pressure equipment.
RTJ – Ring Type Joint
Groove for a metal ring gasket; for high pressure and high temperature service.
T&G – Tongue & Groove
Matching tongue and groove faces keep the gasket aligned and confined.
M&F – Male & Female
Recessed and raised faces that locate the gasket and resist blow-out.
LJ – Lap Joint Face
Sealing face is on the stub end; the loose flange rotates for easy bolt alignment.
Flange Face Finish
Smooth, serrated and mirror finish as per your gasket and service.
- Stock Finish (Serrated)
- Spiral Serrated Finish
- Concentric Serrated Finish
- Smooth Finish
- Mirror Finish
ASME B16.5 Flange Gaskets
- Spiral Wound Gasket
- Soft Gaskets
- RTJ Gasket
- Oval Ring Gasket
- RF Gasket
- Metal Jacketed Gasket
- PTFE Gaskets
Threads of Pipe Flange
- NPT – National Pipe Thread
- BSPT – British Standard Pipe Taper
- BSPP – British Standard Pipe Parallel
- Metric Thread
- UNF – Unified National Fine
Flange Welding Methods
- TIG Welding (GTAW)
- MIG Welding (GMAW)
- Stick Welding (SMAW)
- Submerged Arc Welding (SAW)
Flange Markings
- Manufacturer Identification
- Material & Grade
- Heat Number
- Pressure Rating & Class
- Nominal Size
- Bore Schedule
- Face Type
- Specification / Standard
Flange Testing & Inspection
Every order is tested and inspected before dispatch.
- Spectro Analysis (Direct-reading Spectrograph)
- PMI Testing
- Ultrasonic Flaw Detection
- Magnetic Particle Inspection
- X-Ray / Radiography
- Hydrostatic Testing
- Hardness Test
- Dimensional Inspection
Test Certificates
- Raw Material Certificate
- EN 10204 3.1 / 3.2 MTC
- Third Party Inspection Report
- Radiography Test Report (on request)
How to Choose the Best Flange?
- Quality of Material
- Testing & Inspection
- Manufacturing Process
- Product Range & Customization
- Experience & Reputation
- Timely Delivery
- Customer Service & Support
- Environmental & Safety Standards
Applications of Pipe Flanges
- Defence
- Environmental & Water Projects
- Boilers & Process Equipment
- Heavy Oil Refineries & Pipelines
- Fire Fighting Systems
- Nuclear Power Plants
- Pharma Industries
- Petrochemicals & Acids
Countries We Export To
Canada
Turkey
Spain
Vietnam
Malaysia
Germany
Saudi Arabia
Singapore
France
Mexico
Kuwait
USA
South Korea
Australia
Qatar
Italy
Oman
Egypt
China
Brazil
UAE
Indonesia
UK
Thailand