Flanges Manufacturer, Stockist & Exporter in India

Flanges Manufacturer, Stockist & Exporter in India – Exotic Metals LLP

Introduction: The Critical Link in Piping Integrity

At Exotic Metals LLP our Flanges are the essential components that provide the strength and versatility required for high-pressure piping systems. A flange is a forged or cast ring of metal designed to connect sections of pipe, valves, pumps, and other equipment to create a continuous pipeline. Unlike a permanent welded joint, a flanged connection allows for easy inspection, cleaning, and modification of the system without cutting the pipe.

Flanges Manufacturer & Supplier in India

As a premier manufacturer and exporter in India, Exotic Metals LLP ensures that every flange is produced with a focus on structural homogeneity and sealing face precision. Our flanges are engineered to meet stringent international standards for pressure-temperature ratings, ensuring they maintain a leak-proof seal even under extreme thermal cycling and corrosive attack. Whether you are building a subsea pipeline, a chemical reactor, or a high-temperature steam line, our flanges provide the safety and reliability that global industrial projects demand.

Technical Specification Table

Feature	Details
Size Range	1/2" (DN15) to 48" (DN1200) and higher
Pressure Ratings	Class 150, 300, 600, 900, 1500, 2500
Standard Specifications	ASME B16.5, B16.47 Series A & B, DIN, JIS, EN 1092-1
Flange Faces	Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
Manufacturing	Forging, Heat Treatment, and Precision Machining
Surface Finish	Stock Finish, Spiral Serrated, Concentric Serrated, or Smooth Finish
Thickness	As per Schedule or Custom heavy-wall requirements

Primary Types of Flanges

The functionality of a flange is determined by its attachment method. Exotic Metals LLP offers a comprehensive range of configurations:

Weld Neck Flanges

Characterized by a long tapered hub that is butt-welded to the pipe. This design transfers stress from the flange to the pipe itself, making it the primary choice for high-pressure and high-temperature service where structural integrity is critical
Slip-On Flanges

Designed to slide over the pipe and be welded both internally and externally. While easier to align than weld neck flanges, they are typically limited to lower pressure classes (Class 150 and 300) due to their lower fatigue strength.
Blind Flanges

Used to seal the end of a piping system or a pressure vessel opening. These act as an inspection cover and must withstand significant internal pressure and bolt loading.
Socket Weld Flanges

The pipe is inserted into a socket in the flange and welded with a single fillet weld. These are typically used for small-diameter, high-pressure piping where internal flow turbulence must be minimized.
Lap Joint Flanges

Used in conjunction with a "Stub End." The flange slips over the pipe but is not welded; instead, it backs up the stub end. This is ideal for systems requiring frequent dismantling or when using expensive exotic materials, as the flange can be made of cheaper carbon steel while only the stub end is the exotic alloy.
Threaded Flanges

Similar to slip-on flanges but with internal threads. They are used in specialized applications where welding is hazardous or impossible, though they are generally unsuitable for high-temperature or high-pressure cycles.

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Grade Range: From Structural Steel to Superalloys

We maintain a massive inventory of forgings in materials designed to handle the most aggressive chemical and thermal environments:

Stainless Steel: F304, F304L, F316, F316L, F316Ti, F321, F310, F347, F904L.
Duplex & Super Duplex: ASTM A182 F51, F53, F55, F60 (For offshore and desalination).
Nickel Alloys: Inconel 600, 625, 825, Monel 400, Hastelloy C276, C22, Alloy 20.
Low Alloy Steel: ASTM A182 F5, F9, F11, F22, F91 (For high-heat power piping).
Carbon Steel: ASTM A105, A350 LF2 (Low Temp), A694 (High Yield).

Chemical Composition (%)

Our flanges are forged from high-purity billets to ensure grain flow and strength.

Grade	Carbon (C)	Chromium (Cr)	Nickel (Ni)	Molybdenum (Mo)	Others
ASTM A105	0.35 Max	—	—	—	Mn: 0.60–1.05
SS F316L	0.03 Max	16.0–18.0	10.0–14.0	2.0–3.0	N: 0.10
F51 (Duplex)	0.03 Max	21.0–23.0	4.5–6.5	2.5–3.5	N: 0.14–0.2
Inconel 625	0.10 Max	20.0–23.0	58.0 Min	8.0–10.0	Nb+Ta: 3.15

Mechanical Properties

Tested to ensure safety under maximum bolt-up and internal pressure.

Grade	Tensile (MPa)	Yield (MPa)	Elongation (%)	Hardness (HB)
ASTM A105	485 Min	250 Min	22%	187 Max
SS F316L	485 Min	170 Min	30%	187 Max
F51 (Duplex)	620 Min	450 Min	25%	290 Max
F91 (Alloy)	585 Min	415 Min	20%	248 Max

Flange Face Finishes

At Exotic Metals LLP, the sealing surface is our priority. We offer:

Stock Finish: A continuous spiral groove, suitable for use with various gasket types.
Spiral Serrated: 12 to 55 grooves per inch, creating a high-friction surface for better gasket seating.
Concentric Serrated: Ideal for applications involving very low-density gases where a spiral path might allow leakage.
Smooth Finish: Typically used with metal-to-metal seals or flat gaskets in low-pressure service.

Delivery & Packaging Information

At Exotic Metals LLP, we recognize that even a small scratch on the flange face can cause a catastrophic leak. Our packaging is designed for maximum security:

Face Protection: Every flange face is coated with a thick layer of anti-rust oil and covered with a high-impact plastic or plywood protector.
Secure Crating: Flanges are packed in seaworthy, heat-treated wooden crates (ISPM-15 compliant) with internal dividers to prevent metal-to-metal contact during transit.
Corrosion Shield: For carbon steel grades, we provide black bitumen painting or yellow varnish. Stainless and nickel alloy flanges are wrapped in VCI plastic.
Traceability: Every flange is hard-stamped with the Heat Number, Size, Rating, Grade.
Documentation: Each shipment is accompanied by a Mill Test Certificate (MTC) as per EN 10204 3.1, along with NDT reports (Ultrasonic, Dye Penetrant) and dimensional inspection reports.

Frequently Asked Questions (FAQ)

What is the difference between ASME B16.5 and B16.47?

ASME B16.5 covers flanges from 1/2" up to 24". For larger pipelines, ASME B16.47 provides standards for flanges from 26" up to 60".

Why use a Ring Type Joint (RTJ) face?

RTJ faces utilize a metallic ring gasket that fits into a machined groove. They are designed for high-pressure and high-temperature service (Class 600 and above) where a mechanical seal is required to prevent "blowouts."

Can Exotic Metals LLP provide custom "Long Weld Neck" (LWN) flanges?

Yes. LWN flanges feature a longer hub and are often used as nozzles on pressure vessels and storage tanks. We can manufacture these to custom lengths based on your engineering drawings.

Do you provide "Spectacle Blinds" and "Orifice Flanges"?

Absolutely. We provide specialized piping components including Spectacle Blinds (for isolating sections) and Orifice Flanges (for flow measurement) in all major alloy grades.

Flanges