Flanges Manufacturer & Supplier in India

Amardeep Steel Centre is a leading industrial flanges manufacturer, supplier and exporter based in Mumbai, India, producing steel flanges and pipe flanges to ASME/ANSI B16.5, ASME B16.47, ASTM A182, DIN, BS and EN 1092-1 standards in Stainless Steel, Alloy Steel, Hastelloy, Carbon Steel, Inconel and Nickel Alloy trusted by process industries for consistent quality and full mill test certification.

We supply all types of ASME B16.5 flanges including Weld Neck Flanges, Slip-On Flanges, Blind Flanges, Socket Weld Flanges, Orifice Flanges, RTJ Flanges and Spectacle Blind Flanges. Available in Stainless Steel, Carbon Steel, Alloy Steel, Nickel Alloy, Duplex Steel, Hastelloy, Inconel and Titanium, conforming to ASTM A182, ASME B16.5, ASME B16.47, DIN, BS and EN 1092-1 standards.

What Are Flanges?

A flange is a mechanical coupling device used to connect pipes, valves, pumps and other process equipment into a complete piping system. Two flanges are bolted together with a gasket sandwiched between the mating faces, creating a pressure-tight, leak-proof seal that can be easily disassembled for maintenance, inspection or modification.

Flanges are used across virtually every process industry from oil & gas and petrochemicals to power generation, pharmaceuticals and water treatment. Their design varies by how they attach to the pipe (welded, threaded or loose), how their mating faces are finished (Raised Face, Flat Face, RTJ), and the pressure class they are rated for.

At Amardeep Steel Centre, we manufacture and supply flanges to the most demanding global specifications ASME B16.5, ASME B16.47, EN 1092-1, DIN, BS 4504 and JIS — in an extensive range of metallic alloys for high-temperature, high-pressure and corrosive service conditions. 

½"–48" Size Range (NB) | 12+ Flange Types | 15+ Material Grades | 7 Pressure Classes (ASME) | 50+ Countries Served

What Are Pipe Flanges? And How Do They Work?

Pipe flanges are the most common type of flange, used to connect straight pipe runs to other pipe, valves, pumps and vessels. A typical flanged pipe connection has three parts: the pipe flange itself, a gasket, and the bolting that draws the two flange faces together. Because the joint is bolted rather than welded, pipe flanges give a piping system flexibility; sections can be unbolted for cleaning, inspection, or to swap in a valve or instrument, then reassembled without cutting or re-welding the line.

The right pipe flange for a given point in a system depends on how it attaches to the pipe (welded, slipped-on, threaded or loose on a stub end), the facing on its mating surface, and the pressure class it must hold at the operating temperature all covered below.

Shop by Flange Type

We manufacture all major flange types to ASME, DIN, EN and BS standards. Each type is suited to a specific connection method and service condition. Click any type for full dimensional data and grades.

Flange Facing Types Explained

The face type determines which gasket is used and how the seal is formed. We supply all of the following:

• Raised Face (RF): a small raised ring around the bore that concentrates bolt load onto a ring-type gasket; the most common facing for ASME B16.5 flanges in general process service.
• Flat Face (FF): the mating surface is flush across the full flange face, used with a full-face gasket; specified when bolting to cast iron or non-metallic equipment that cannot tolerate the point loading of a raised face.
• Ring Type Joint (RTJ): a machined groove holds a solid metal ring gasket (oval or octagonal profile); used for high-pressure, high-temperature refinery, subsea and wellhead service where a soft gasket cannot hold the seal.
• Tongue & Groove (T&G) and Large/Small Male-Female (LMF/SMF): a raised tongue on one flange mates into a matching groove on the other, self-aligning the gasket; common on pumps, compressors and cryogenic piping.
• Lap Joint (LJ): used with a separate stub end; the flange itself is not welded to the pipe, which lets it rotate freely for bolt-hole alignment.

Facing surfaces are also finished smooth or serrated: smooth finishes are generally paired with metallic (e.g. RTJ) gaskets, while serrated finishes help soft gaskets bite in and seal at lower bolt loads.

How to Choose the Right Flange

• Pressure-temperature rating: match the ASME Class (150-2500 LBS) or DIN PN rating to the line's design pressure at its maximum operating temperature; rating drops as temperature rises.
• Dimensional standard: confirm ASME B16.5/B16.47, EN 1092-1, DIN, BS or JIS, since bolt circles, hole counts and hub dimensions differ between standards even at the same nominal size.
• Facing type: RF for general service, RTJ for high-pressure/high-temperature or subsea service, FF for cast-iron/non-metallic mating equipment, T&G/M&F for precise gasket seating.
• Attachment method: Weld Neck for high-pressure/cyclic/critical lines, Slip-On for moderate-pressure general piping, Socket Weld for small-bore high-pressure lines, Threaded where welding isn't permitted, Blind to terminate or pressure-test a line.
• Material compatibility: Carbon Steel for general/utility service, Stainless Steel for corrosive/hygienic service, Duplex/Super Duplex or Hastelloy/Inconel for chloride-rich or highly corrosive/high-temperature service, NACE-compliant materials for sour (H2S) oil & gas service.

Understanding Flange Markings

Every flange we supply is permanently stamped on its outer rim so it can be identified and verified on site, typically in this order: manufacturer's mark, material/ASTM grade, pressure-temperature class, nominal size, wall thickness/schedule (for weld neck flanges), and heat number for full material traceability back to its mill test certificate. Ring Type Joint flanges additionally carry the ring-groove number, and repaired or heat-treated pieces carry the relevant code (e.g. QT for quenched & tempered).

Shop by Flange Material

All flanges are available in a comprehensive range of engineering alloys selected for corrosion resistance, mechanical strength, and compatibility with the process fluid and temperature.

Specialty & High-Performance Alloy Flanges

Beyond the 12 core material families above, we also supply the following specialty alloy flanges for severe-service applications not covered by a standard material card:

• SMO 254 Flanges — 6-Moly super-austenitic stainless steel (UNS S31254) for chloride-rich and seawater service.
• Alloy 28 Flanges — high-nickel, high-chromium alloy for sulphuric and phosphoric acid service.
• Sanicro 28 Flanges — austenitic alloy for strong acid environments in chemical processing.
• Zirconium 702 Flanges — outstanding resistance to hydrochloric and sulphuric acid; used in the most aggressive chemical processes.

ASTM A182 Grade Reference

ASTM A182 is the governing specification for forged alloy and stainless steel pipe flanges, fittings and valves intended for high-temperature service. All applicable Amardeep Steel flanges conform to ASTM A182 / ASME SA182 with full heat-to-test traceability.

• ASTM A182 F304 / F304L - Austenitic SS, general corrosion service
• ASTM A182 F316 / F316L - Austenitic SS, chloride & marine environments
• ASTM A182 F321 / F321H - Ti-stabilised SS, elevated temperature service
• ASTM A182 F347 / F347H - Nb-stabilised SS, nuclear & boiler applications
• ASTM A182 F11 / F22 / F91 - Cr-Mo alloy steel, high-pressure / high-temperature
• ASTM A182 F91 - 9Cr-1Mo-V ultra-high-temperature, creep-resistant power plant service
• ASTM A182 F5 / F9 - refinery and petrochemical high-temperature service
• ASTM A182 F51 / F53 - Duplex & Super Duplex SS for offshore and chloride-rich environments

Flange Standards & Norms

Amardeep Steel Centre manufactures flanges to a comprehensive set of international standards and pressure norms. Whether your project specifies ASME, DIN, BS, EN or JIS, we can supply to specification.

• ASME / ANSI Standards: B16.5, B16.47 Series A & B, B16.48, B16.36, B16.20, MSS SP44
• British Standards: BS 4504 Sec 3.1 & Part 1, BS 10, BS 1560 BOSS, BS 3293
• DIN / European Standards: DIN 2527, 2566, 2573, 2576, 2627-2638, 2641, 2642, 2655, 2656, 2673, EN 1092-1
• Japanese Industrial Standard: JIS B2220, KS B1503
• API Standards: API 6A, API 605, API 7S-15 & 7S-43
• Other International Standards: AWWA C207, GOST 12820, ISO 70051, SABS 1123, NFE 29203, UNI 2276, AS 2129

Manufacturing Process & Quality Traceability

Our flanges are produced by open/closed-die forging (or plate/cut for larger diameters), followed by heat treatment, CNC machining to final dimension and face finish, and surface coating (black oil paint, anti-rust epoxy, zinc plating or hot/cold-dip galvanising as specified). Every heat is traceable from raw material through to the finished, stamped flange:

• Raw material verified by direct-reading spectrograph and Positive Material Identification before it enters production
• Dimensional and visual inspection at each production stage
• Hydrostatic testing, radiographic (X-ray) and ultrasonic flaw detection, and magnetic particle inspection available per specification
• Heat number and batch code marked on every piece, linked back to its EN 10204 3.1/3.2 mill test certificate
• Third-party witness inspection by SGS, BV, TUV or Lloyds arranged on request

Flange Applications

Amardeep Steel flanges are trusted in the world's most demanding process industries. Our materials and certifications are selected to meet strict safety, pressure and corrosion-resistance requirements.

• Oil & Gas: Upstream, midstream & downstream pipelines, wellheads and refineries
• Petrochemicals: Chemical plants, cracker units, acid and caustic process piping
• Power Generation: High-pressure steam lines, nuclear plants, gas turbines and boilers
• Marine & Offshore: Subsea pipelines, offshore platforms, FPSO and shipbuilding
• Pharmaceutical: Hygienic SS flanges for sterile process and clean-room piping
• Water Treatment: Water supply, desalination, wastewater and irrigation systems
• Construction & EPC: Infrastructure, industrial plants, fabrication shops & EPC contractors
• Acids & Corrosives: Hastelloy, Titanium and Nickel flanges for aggressive chemical service
• Food, Beverage & Dairy: Hygienic stainless steel flanges for sanitary process piping
• Pulp & Paper: Process piping for pulping, bleaching and chemical recovery
• Fertiliser & Agrochemicals: Flanges for corrosive acid and ammonia process streams

Why Amardeep Steel for Flanges?

• ISO-compliant manufacturing facility in Mumbai
• Full traceability with heat number marked on every piece
• EN 10204 Type 3.1 mill test certificates as standard
• Third-party inspection by SGS, BV, TUV and Lloyds available
• Radiographic and ultrasonic testing on request
• Fast lead times with ex-stock supply on common grades
• EIL approved vendor
• Exporting to 50+ countries since decades

Price List of ANSI B16.5 Flanges

We offer competitively priced SS Flanges products for a wide range of industrial and commercial applications. Please call or email us to request the latest price list, ready stock availability, and a customized quotation based on your requirements.