Leading Supplier, Stockist and Exporter of Flanges
BB Infras is a trusted global supplier, stockist and exporter of industrial flanges — including weld neck, slip-on, blind, threaded, socket weld and lap-joint flanges — used across oil & gas, petrochemical, power, water treatment, shipbuilding and infrastructure projects. Our extensive inventory and worldwide logistics capability make us a preferred partner for engineers, fabricators and procurement teams.
We supply flanges in a broad range of materials: Carbon Steel (A105 / A350), Stainless Steel (304 / 316 / 316L / 310), Alloy Steels (chrome-moly grades), Duplex & Super Duplex stainless steels (2205 / 2507), nickel alloys (Inconel®), corrosion-resistant alloys (Hastelloy®), Monel®, copper alloys (brass / bronze), and engineered options such as PTFE-lined flanges. This material breadth lets us match flange selection to pressure, temperature and corrosion environments.
All BB Infras flanges are manufactured and inspected to international standards such as ASME B16.5, ASME B16.47, API, DIN and EN standards. We supply flanges in all common pressure classes (150# to 2500#, PN6 to PN420) and in sizes from ½" up to large-diameter rings for piping and pressure-vessel applications. Each flange is supplied with the appropriate MTC and inspection documentation on request.
Quality control is central to our operations. Flanges are produced from certified billets/forgings, machined to finish, and undergo dimensional checks, face finish verification, hydrostatic/test flange fitting. For critical and exotic materials we provide PMI/chemical analysis, hardness tests and third-party inspection (TPI) as required by project specifications.
BB Infras supports custom and special requirements: RTJ (Ring-Type Joint) flanges for high-pressure service, raised-face or flat-face finishes, special bore polishing for hygienic systems, and PTFE linings for aggressive chemistry. We also offer machining services (drilling, facing, beveling) and full supply packages including bolts, gaskets and studs.
Specifications of Flanges
| Material | Standards | Types |
|---|---|---|
| Stainless Steel (304, 304L, 316, 316L, 321, 310, 347) | ASTM A182 / ASME SA182, ANSI B16.5, B16.47, MSS-SP44 | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, RTJ |
| Carbon Steel (A105, A350 LF2, A516 Gr.70) | ASTM A105 / A350, ANSI B16.5, B16.47 | Weld Neck, Slip-On, Blind, Threaded, Long Weld Neck |
| Alloy Steel (F11, F22, F5, 4130, 4140) | ASTM A182 F11/F22/F5, ASME B16.5 | WN, SO, BL, High-Pressure RTJ Flanges |
| Duplex & Super Duplex (S31803, 2205, 2507) | ASTM A182 F51/F53/F55 | Weld Neck, Blind, Slip-On, RTJ |
| Nickel Alloys (Inconel, Monel, Hastelloy) | ASTM B564 | WN, SO, BL, SW, RTJ |
| Cast Iron / Ductile Iron | EN 1092-2, IS Standards | PN6 / PN10 / PN16 Flanges |
| PVC / UPVC / CPVC / HDPE | ASTM D1785 / F441 / ISO 4427 | Backing Ring Flanges, Stub End Flanges |
Chemical Composition of Flange Materials
| Material | C% | Mn% | Si% | Cr% | Ni% | Mo% |
|---|---|---|---|---|---|---|
| SS 304 / 304L | 0.03 | 2.00 | 0.75 | 18–20 | 8–10.5 | - |
| SS 316 / 316L | 0.03 | 2.00 | 0.75 | 16–18 | 10–14 | 2–3 |
| Carbon Steel A105 | 0.35 | 0.60–1.05 | 0.10–0.35 | - | - | - |
| Alloy Steel F22 | 0.15 | 0.30–0.60 | 0.50 | 2.00–2.50 | - | 0.90–1.20 |
| Duplex 2205 | 0.03 | 2.00 | 1.00 | 22 | 5.5 | 3.0 |
Mechanical Properties of Flanges
| Material | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| SS 304 / 304L | 515 | 205 | 40 | 160 |
| SS 316 / 316L | 520 | 205 | 40 | 150 |
| Carbon Steel A105 | 485 | 250 | 22 | 187 |
| Alloy Steel F22 | 620 | 415 | 20 | 200 |
| Duplex 2205 | 620 | 450 | 25 | 290 |
Equivalent Grades of Flange Materials
| Material | UNS | Werkstoff Nr. | EN | JIS |
|---|---|---|---|---|
| SS 304 | S30400 | 1.4301 | X5CrNi18-10 | SUS304 |
| SS 316 | S31600 | 1.4401 | X5CrNiMo17-12-2 | SUS316 |
| Carbon Steel A105 | - | - | C22.8 | - |
| Alloy Steel F22 | K21590 | 1.7380 | 10CrMo9-10 | - |
| Duplex 2205 | S32205 | 1.4462 | X2CrNiMoN22-5-3 | - |
Flange Dimension Chart (ASME B16.5)
| NPS (Inch) | OD (mm) | Bolt Circle (mm) | Number of Bolts | Bolt Size |
|---|---|---|---|---|
| 1/2" | 90 | 60.3 | 4 | M12 |
| 1" | 125 | 85 | 4 | M12 |
| 2" | 150 | 120.5 | 4 | M16 |
| 4" | 230 | 190.5 | 8 | M16 |
| 6" | 280 | 241.5 | 8 | M20 |
| 8" | 345 | 298.5 | 8 | M20 |
| 12" | 490 | 444.5 | 12 | M24 |
With competitive pricing, strong stock positions and a global export network, BB Infras delivers timely consignments to major ports and project sites worldwide. Whether you require standard stock items or engineered flange rings for a critical project, our team will provide technical guidance, competitive offers and fast turnaround.
Uses of Flanges
Flanges are essential components used in piping systems to ensure safe, leak-free, and efficient fluid or gas transfer across various industries. They connect, control, regulate, and support pipelines operating under different temperature and pressure conditions.
1. Oil & Gas Industry
Flanges are widely used in onshore and offshore drilling operations, refinery pipeline systems, gas distribution networks, and high-pressure fluid transfer. Their corrosion resistance and temperature tolerance make them ideal for harsh environments.
2. Petrochemical & Chemical Industry
These fittings are crucial in chemical processing plants, acid/alkali lines, solvent transfer systems, and hazardous chemical handling. Materials are selected based on corrosion resistance and compatibility with chemicals.
3. Power Generation Industry
Flanges are used in boiler lines, steam pipelines, turbine systems, and cooling water networks. They withstand high pressure and extreme temperatures in thermal, nuclear, and renewable energy plants.
4. Water Treatment & Desalination Plants
Applications include RO systems, filtration units, pumping stations, and municipal water supply lines. Fittings provide durability, corrosion resistance, and long-term leak-proof performance.
5. Food & Beverage Industry
Stainless steel sanitary fittings ensure hygienic flow in dairy units, breweries, beverage manufacturing, and food processing systems. They prevent contamination and meet high hygiene standards.
6. Pharmaceutical Industry
Flanges are used in cleanroom piping, purified water systems, drug manufacturing units, and sterile processing operations. They comply with GMP and maintain contamination-free fluid handling.
7. Construction & Infrastructure
Used in firefighting systems, HVAC networks, plumbing systems, and building pipelines. Flanges ensure reliable flow and structural stability across large infrastructure projects.
8. Marine & Shipbuilding
Marine-grade fittings are used in seawater pipelines, ballast systems, and fuel/oil transfer lines. They offer high resistance to corrosion in saltwater environments.
9. Automotive & Aerospace
Essential for fuel injection lines, hydraulic systems, coolant pipelines, and high-pressure circuits. They withstand vibration, heat, and pressure fluctuations in vehicles and aircraft.
10. Mining & Metal Processing
Flanges are used in slurry pipelines, ore processing systems, and high-abrasion environments. Alloy steel fittings provide strength, wear resistance, and durability.
FAQ — Frequently Asked Questions
- Q: What types of flanges does BB Infras offer?
- A: We offer Weld Neck, Slip-On, Blind, Threaded, Socket Weld, Lap Joint and RTJ flanges in a wide range of materials and pressure classes.
- Q: Which materials are commonly used for flanges?
- A: Common materials include Carbon Steel (A105/A350), Stainless Steel (304/316), Alloy Steels, Duplex & Super Duplex, Inconel, Hastelloy, Monel, Brass and PTFE-lined options for corrosive services.
- Q: Can you supply flanges with mill test certificates and inspection?
- A: Yes. All flanges can be supplied with MTC (EN 10204 3.1), PMI, NDT reports and third-party inspection on request.
- Q: Do you provide custom or large-diameter flanges?
- A: Yes. BB Infras supplies custom machined flanges, large-diameter welded rings, and fabricated flange spools per project drawings.
- Q: What flange face types are available?
- A: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male/Female and Tongue & Groove are available depending on the application.
- Q: How do I specify a flange for corrosive service?
- A: Specify the media, temperature, and required pressure class. We will recommend a material (e.g., duplex/super-duplex, Inconel, Hastelloy, or PTFE lining) and provide appropriate datasheets.
- Q: What is the typical lead time for flanges?
- A: Stock items typically ship within 3–10 working days. Exotic materials, custom machining or large-volume orders may require 2–8 weeks depending on material availability and inspection requirements.
Countries we have exported our products to
Turkey, Thailand, Bulgaria, Serbia, Mexico, Estonia, Trinidad & Tobago,Tunisia, New Zealand, Indonesia, Puerto Rico, Ireland, India, Morocco, Brazil, Lebanon, Hong Kong, Jordan, Ukraine, Switzerland, Czech Republic, Lithuania, Sri Lanka, Greece, Taiwan, Zimbabwe, Algeria, Romania, Mexico, Ghana, Italy, Philippines, Spain, United Kingdom, Finland, Azerbaijan, Japan, Macau, Israel, Saudi Arabia, Kenya, Bhutan, Poland, Poland, Costa Rica, Kuwait, Singapore, Pakistan, France, Colombia, Tibet, Bolivia, Portugal, Iraq, Australia, Kazakhstan, Nepal, Mongolia, Gambia, Malaysia, Chile, Germany, Slovakia, China, Bahrain, Denmark, Angola, Afghanistan, Peru, Austria, Ecuador, Gabon, Croatia, South Africa, Sweden, Chile, Hungary, United Arab Emirates, Argentina, Bangladesh, Oman, Egypt, United States, Belgium, Canada, Namibia, Norway, Qatar, Belarus, Netherlands.
Cities we have supplied our products to
Bengaluru, Vung Tau, Nashik, Jaipur, Navi Mumbai, La Victoria, Al Jubail, Noida, Granada, Doha, Dammam, Ernakulam, Chandigarh, Santiago, Melbourne, Surat, Nagpur, Ranchi, Kanpur, Jakarta, Ahvaz, Indore, Jamshedpur, Muscat, Rajkot, Lahore, Chiyoda, Milan, Hong Kong, Riyadh, Houston, Busan, Calgary, Madrid, Visakhapatnam, Atyrau, Bhopal, Algiers, Colombo, Kolkata, Petaling Jaya, Dallas, London, Cairo, Thiruvananthapuram, Caracas, Howrah, Moscow, Port-of-Spain, Baroda, Mexico City, Gurgaon, Singapore, Aberdeen, Coimbatore, Kuala Lumpur, Perth, Ahmedabad, New York, New Delhi, Manama, Abu Dhabi, Montreal, Jeddah, Pune, Vadodara, Kuwait City, Chennai, Geoje-si, Tehran, Mumbai, Hanoi, Karachi, Pimpri-Chinchwad, Thane, Haryana, Ulsan, Seoul, Dubai, Ho Chi Minh City, Toronto, Hyderabad, Los Angeles, Faridabad, Lagos, Sydney, Courbevoie, Bangkok, Bogota, Rio de Janeiro, Ankara, Al Khobar, Ludhiana, Istanbul, Gimhae-si, Brisbane, Edmonton, Sharjah, Secunderabad.
