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ASTM A182 / ASME B16.5
ASME B16.47, EN 1092-1 on request
SS 304, 304L, 316, 316L, 321, 2205
Austenitic & duplex forging grades
1/2″ (DN15) – 48″ (DN1200)
Larger bores on indent basis
Class 150 – 2500
PN6 – PN100 in EN 1092-1
RF, FF, RTJ, Tongue & Groove
Male-Female face on request
EN 10204 3.1 / 3.2
Batch-wise MTC, PMI & RT on request
Genuine Forged Stock
Heat-traceable billet on every flange
100% PMI Checked
Chemistry verified before dispatch
Ex-Stock Dispatch
Common classes machined & ready to load
Face Machined To Drawing
RF, FF, RTJ & special bore on request
Global Compliance Docs
PED, NACE MR0175 & DFARS paperwork ready
Quote In 2 Hours
Dedicated desk for price & stock checks
📌 Table of Contents
We stock Stainless Steel Flanges — Slip On, Weld Neck, Blind, Socket Weld, Threaded, Lap Joint, RTJ and Spectacle Blind — machined to ASME B16.5 and ASTM A182, ex-stock and mill-certified under EN 10204 3.1/3.2. Grades span SS 304, 316, 317L and 904L for chemical, marine and high-chloride duty, with PED, NACE MR0175 and DFARS documentation available on request. Shipped from Mumbai to Saudi Arabia, the Netherlands and the USA, with a Houston base serving Texas, California, Wisconsin, Kansas, Indiana and Florida — every batch is PMI-checked and heat-traceable before dispatch.
Our production follows ASTM A182 and ASME B16.5 specification, as a certified Stainless Steel Flanges Manufacturer in India.
Stainless Steel 304 Flanges
General-purpose austenitic grade for chemical and food-grade piping at moderate temperatures.Stainless Steel 304L Flanges
Low-carbon 304 variant that resists intergranular corrosion after welding.Stainless Steel 310 Flanges
High-chromium/nickel grade built for furnace, heat-treatment and high-temperature service.Stainless Steel 316 Flanges
Molybdenum-alloyed grade with superior resistance to chlorides and marine environments.Stainless Steel 316L Flanges
Low-carbon 316 for welded assemblies exposed to chloride and pitting corrosion risk.Stainless Steel 321 Flanges
Titanium-stabilized grade for sustained high-temperature service without carbide sensitization.Stainless Steel 347 Flanges
Niobium-stabilized grade suited to high-temperature welded piping in petrochemical service.Every Stainless Steel Flange we forge is manufactured against a named international standard, not a generic "equivalent" spec, so the paperwork matches the metal on inspection day.
ASTM A182 / ASME SA182
Primary US forging standard for high-pressure, high-temperature flanges.ASME B16.5
Face dimensions and pressure classes, NPS 1/2" to 24".ASME B16.47
Large-diameter Weld Neck and Blind flanges, NPS 26"-60".EN 1092-1
European dimensional standard for EU-spec projects.JIS B2220
Japanese dimensional standard for JIS-spec orders.BS 4504 / BS 10
British standard common on Middle East and Africa jobs.Our warehouse, a leading Stainless Steel Flanges Stockist in Mumbai, supplies flanges for oil & gas, chemical and marine piping applications
Oil & Gas Pipelines
Chemical & Petrochemical Plants
Desalination Plants
Marine & Shipbuilding
Food & Beverage Processing
Pharmaceutical & Biotech
Power & Utility Plants
Water & Wastewater Treatment
a recognised Stainless Steel Flanges Supplier in India, cross-references ASTM, DIN and JIS equivalent grades for every enquiry
Class 150 Weld Neck dimensions per ASME B16.5 – other classes & types on request.
| Pipe Sizes | WEIGHT (KG) | DIMENSIONS | ||||
|---|---|---|---|---|---|---|
| NPS (Inches) |
DN (mm) | BLIND | WN | SOW SW |
Size MM |
THICKNESS |
| 2 | 50 | 2.4 | 2.6 | 2.1 | 152.4 | 19.1 |
| 1 1/4 | 32 | 1.2 | 1.3 | 1 | 117.3 | 15.7 |
| 4 | 100 | 7.0 | 6.8 | 5.3 | 228.6 | 23.9 |
| 5 | 125 | 8.6 | 8.6 | 6.1 | 254 | 23.9 |
| 2 1/2 | 65 | 3.9 | 4.1 | 3.3 | 177.8 | 22.4 |
| 3 | 80 | 4.9 | 4.9 | 3.9 | 190.5 | 23.9 |
| 1/2 | 15 | 0.4 | 0.5 | 0.4 | 88.9 | 11.2 |
| 3/4 | 20 | 0.6 | 0.7 | 0.6 | 98.6 | 12.7 |
| 3 1/2 | 90 | 6.2 | 6.1 | 4.8 | 215.9 | 23.9 |
| 1 | 25 | 0.9 | 1 | 0.8 | 108 | 14.2 |
| 1 1/2 | 40 | 1.5 | 1.7 | 1.3 | 127 | 17.5 |
| 6 | 150 | 11.3 | 10.6 | 7.5 | 279.4 | 25.4 |
| 8 | 200 | 19.6 | 17.6 | 12.1 | 342.9 | 28.4 |
| 10 | 250 | 28.6 | 24 | 16.5 | 406.4 | 30.2 |
| 16 | 400 | 76.1 | 60.6 | 44.8 | 596.9 | 36.6 |
| 18 | 450 | 93.7 | 68.3 | 48.9 | 635 | 39.6 |
| 12 | 300 | 43.2 | 36.5 | 26.2 | 482.6 | 31.8 |
| 14 | 350 | 58.1 | 48.4 | 34.6 | 533.4 | 35.1 |
| 20 | 500 | 122.0 | 84.5 | 61.9 | 698.5 | 42.9 |
| 24 | 600 | 185.0 | 115 | 86.9 | 812.8 | 47.8 |
Being an ISO-certified Stainless Steel Flanges Manufacturer in India, we verify tensile strength, yield and hardness on every lot.
As a trusted Stainless Steel Flanges Supplier in India, we test every heat for Chromium, Nickel and Molybdenum content before dispatch.
| Grade | C Max | Cr | Ni | Mo | Others |
|---|---|---|---|---|---|
| 304 | 0.08 | 18.0–20.0 | 8.0–10.5 | — | — |
| 304L | 0.03 | 18.0–20.0 | 8.0–12.0 | — | — |
| 316 | 0.08 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | — |
| 316L | 0.03 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | — |
| 321 | 0.08 | 17.0–19.0 | 9.0–12.0 | — | Ti stabilized |
| 410 | 0.15 | 11.5–13.5 | — | — | Martensitic |
As a global Stainless Steel Flanges Exporter, we ship Class 150 through Class 2500 pressure rated flanges worldwide.
Whether you need slip on, weld neck or blind, our Stainless Steel Flanges Stockist In Mumbai carries all types in ready stock.
Working as a Stainless Steel Flanges Exporter, we regularly ship Slip On, Weld Neck, Blind, Socket Weld and Lap Joint types.
Most common face – 1.6mm or 6.4mm raised ring for gasket seating
Level sealing surface – used against cast iron flanges
Machined groove for metal ring gasket – high pressure service
Interlocking male-female pair – precise alignment, low bolt torque
Raised step and matching recess – used on valve & pump joints
Every batch from our Stainless Steel Flanges Stockist in Mumbai facility is checked against ASME B16.5 dimensional tolerances.
Grade, class & heat no. stamped on rim
Heat number on cert must match the piece
Spectrometer scan confirms actual grade
OD, BCD & bolt holes against ASME B16.5
Genuine austenitic forging stays non-magnetic
As a compliant Stainless Steel Flanges Manufacturer in India, we issue invoices under the correct HS code for smooth customs clearance.
Stainless Steel Flanges Freight Corridors We Cover
Chemical Compatibility
Process Control Gaps
On-Site Handling
Sensitization Risk
Grain Structure Damage
Fatigue Initiation Point
As a well-known Stainless Steel Flanges Stockist in Mumbai, we carry out PMI, hydrostatic and radiography testing on stocked material
Flaring Test
Hardness Test
Chemical Analysis
Pitting Resistance Test
Mechanical Testing
Impact Testing
25% Nickel, 20% Chromium – excellent acid resistance
Higher molybdenum content improves resistance to acid
2–3% Molybdenum content gives superior acid resistance
8% Nickel, 18% Chromium – excellent oxidation & corrosion resistance
Aesteiron holds, stocks and ships Stainless Steel Flanges directly from its own warehouses across the regions listed below — functioning as a genuine stocking partner rather than a trading intermediary.
Johannesburg, South Africa Stockist Hub
Central warehouse serving Southern African fabricators
Dubai, UAE Stockist Hub
Flagship hub for Middle East orders and onward shipment
Houston, USA Stocking Distributor
Ready inventory for oil, gas & petrochemical buyers
Lagos, Nigeria Stocking Distributor
Local desk covering West African process plants
Baku, Azerbaijan Distributor
Onward supply line into the Caspian belt
Casablanca & Tangier, Morocco Stockist
Port-side stock for West Mediterranean projects
Cairo, Egypt Stock Holder
North African base for refinery & utility clients
São Paulo, Brazil Stockist
Industrial supply point for South American demand
Yerevan, Armenia Distributor
Regional link across the Caucasus corridor
Addis Ababa, Ethiopia Distributor
Growing East African stockist presence
Algiers, Algeria Distributor
Coverage across the wider Maghreb belt
Buenos Aires, Argentina Stock Holder
Southern Cone reach for engineering buyers
Mexico City, Mexico Distributor
Gateway supply link into Central America
Dakar, Senegal Stock Holder
Coastal distribution point for West Africa
Seychelles Supplier
Onward routing across the Indian Ocean islands
6″ NB, RF face, PMI verified, EN 10204 3.1 MTC.
Offshore Oil & Gas EPC Contractor, UAE
ABU DHABI, UAE8″ NB, RF face, hydrotested, third-party witnessed inspection.
Water Treatment EPC Contractor, Algeria
ALGIERS, ALGERIA4″ NB, RTJ face, PMI verified, EN 10204 3.2.
Chemical Processing Plant, Nigeria
LAGOS, NIGERIA10″ NB, bright finish, straightness certified, UT tested.
Shipyard & Marine Fabricator, Seychelles
VICTORIA, SEYCHELLES3″ NB, forged, 950 MPa min, EN 10204 3.1 MTC.
Oil & Gas EPC Contractor, Houston, USA
HOUSTON, TEXAS, USA2″ NB, machined bore, EN 10204 3.1 MTC.
Petroleum Refining Company, Cairo, Egypt
CAIRO, EGYPTSlip On and Weld Neck flanges in Class 150 and 300 cover the majority of general piping enquiries, with Weld Neck preferred for higher pressure or cyclic load lines.
Yes, Weld Neck and Blind flanges can be machined with a Ring Type Joint groove for high pressure and high temperature service on request.
A Slip On flange slides over the pipe and is fillet welded on both sides, while a Weld Neck flange butt welds to the pipe with a tapered hub for better stress distribution under pressure.
Austenitic grades such as 304 and 316 are essentially non-magnetic in the annealed condition, while duplex grades like 2205 show mild magnetic response.
Every order ships with an EN 10204 3.1 mill test certificate as standard, with 3.2 third-party witnessed certification, PMI and radiography reports available on request.
Why Aesteiron?
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Conclusion
Stainless Steel Flanges referenced to ASTM A182 / ASME B16.5, available across Slip On, Weld Neck, Blind, Socket Weld, Threaded, Lap Joint, RTJ and Spectacle Blind types in 304, 316, 321 and 2205 duplex, are the dependable choice for oil & gas, chemical, marine and process-plant piping. Buyers across the Middle East, Africa and the Americas trust us as a responsive stockist and supplier for quick price and stock confirmation.
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