Amigo Impex is a super duplex steel flange manufacturer, stockist and exporter based in Mumbai, India, supplying super duplex flanges since 2013. We supply Super Duplex S32750 (UNS S32750 / 2507 / F53) and Super Duplex S32760 (UNS S32760 / F55) flanges to ASTM A182 / ASME SA-182. Cutting, machining, threading, fabrication, testing and packing are carried out in-house.
Super duplex stainless steel flanges combine high strength with strong resistance to chloride corrosion. Their ferrite-austenite microstructure provides a balance of mechanical strength and corrosion resistance. Chromium content is typically around 25%, while molybdenum and nitrogen further improve resistance to pitting, crevice corrosion and chloride stress corrosion cracking. This makes super duplex flanges suitable for seawater, offshore, desalination, chemical processing and other demanding environments.
Sizes range from NPS 1/2" to 24" under ASME B16.5 and from NPS 26" to 60" under ASME B16.47. Class 150 through 2500 ratings are available within the applicable dimensional standards, with five facing options and eleven flange patterns supplied. Weld neck, blind and slip-on flanges account for many regular requirements.
Mumbai stock holds approximately 60 to 70 tonnes of ready material. Each order is supplied with an EN 10204 3.1 mill test certificate, while 3.2 certification is arranged when required. Our company holds AS 9120B, PED, ISO 9001:2015 and ISO 45001:2018 certifications. Supply covers pan-India, with export shipments to the USA, Gulf, European and Asian markets.
The specification table below gives the main material, dimensional, pressure, facing and certification details used when quoting Super Duplex Steel Flanges.
Material and dimensional requirements are covered by different standards. ASTM A182 / ASME SA-182 governs the forged material, while ASME and other dimensional standards define flange dimensions, drilling and facing requirements.
| Category | Standard |
|---|---|
| Forged Flange Material | ASTM A182 / ASME SA-182 |
| Dimensions, NPS 1/2" to 24" | ASME B16.5 |
| Dimensions, NPS 26" to 60" | ASME B16.47 Series A & B |
| European Dimensions | EN 1092-1 |
| British Flange Standards | BS 4504; BS 10 Table D |
| Other Export Standards | DIN; JIS B2220 |
| Material Documentation | EN 10204 3.1 / 3.2 |
Our main grades for super duplex flanges are S32750 and S32760. Both are high-alloy duplex stainless steels designed for demanding chloride and seawater environments.
S32750 is one of the most widely specified 25Cr super duplex grades. It combines high mechanical strength with strong resistance to pitting, crevice corrosion and chloride stress corrosion cracking. It is commonly selected for offshore, seawater, chemical and desalination applications.
S32760 provides high strength and corrosion resistance for severe chloride environments. Its alloying additions include chromium, molybdenum, nitrogen, copper and tungsten, making it suitable for seawater systems, offshore equipment and chemical processing.
The applicable dimensional standard depends on the nominal pipe size. Standard sizes within ASME B16.5 and B16.47 are supplied, while special dimensions can be produced or machined against an approved drawing.
| Parameter | Range |
|---|---|
| ASME B16.5 Coverage | NPS 1/2" to 24" |
| ASME B16.47 Coverage | NPS 26" to 60" |
| Metric Equivalent | DN 15 to DN 1500 |
| Frequently Quoted Sizes | 3", 4" and 6" |
| Custom Sizes | Diameter, thickness and drilling to drawing |
The pressure rating depends on the flange class, material group, size and service temperature. ASME B16.5 and B16.47 define the applicable pressure-temperature ratings for their respective size ranges.
Class 2500 is limited to NPS 12 under ASME B16.5. Above NPS 24, ASME B16.47 rates flanges up to Class 900, but Class 900 is tabulated only from NPS 26 to NPS 48 in both Series A and Series B. From NPS 50 to NPS 60 the highest class covered by ASME B16.47 is Class 600.
| Dimensional Standard | Pressure Classes |
|---|---|
| ASME B16.5 | Class 150, 300, 400, 600, 900 and 1500 (NPS 1/2" to 24"); Class 2500 (NPS 1/2" to 12") |
| ASME B16.47 Series A | Class 150 to 900 |
| ASME B16.47 Series B | Class 75 to 900 |
Different piping connections require different flange configurations. Amigo Impex supplies the following super duplex flange types in standard and made-to-order dimensions:
ASME B16.47 covers only weld neck and blind flanges in NPS 26" to 60". Other patterns in this range, including slip-on, socket weld, threaded and lap joint, are supplied to manufacturer dimensions using B16.47 drilling and bolt circles. For these sizes, please share the required drilling and facing details with the enquiry.
Plate flanges and spectacle blinds are produced from super duplex plate to ASTM A240 rather than from forgings, so the material certificate for these items is issued against ASTM A240 and not ASTM A182.
The flange facing is selected according to the gasket, mating component and service conditions. The following facing options are available:
Individual machined faces are protected before packing. Flanges are packed in hardwood cases, crates or strapped pallets depending on the size and quantity ordered. Each piece is marked with the grade, heat number, size, class and specification, when appropriate.
Domestic orders are delivered pan-India while export consignments are transported from Mumbai to USA, Gulf, European and Asian markets. Ready stock goods may normally be delivered within 1 to 2 days, while made to order forgings take about 30 days, subject to the specifications.
Material chemistry and mechanical properties are documented on the EN 10204 3.1 mill test certificate supplied with each order. Dimensional inspection is carried out against the applicable ASME B16.5 or B16.47 requirements before dispatch.
Positive material identification and other inspection requirements can be arranged according to the purchase order. Third-party inspection is also supported, and EN 10204 3.2 certification is available when specified. Amigo Impex holds AS 9120B, PED, ISO 9001:2015 and ISO 45001:2018 certifications.
Contact Amigo Impex for the current price against a confirmed specification.
Request a Quote60–70 tonnes held in Mumbai, with urgent requirements dispatched within one to two days.
AS 9120B, PED, ISO 9001:2015 and ISO 45001:2018, with an MTC on every order.
Cutting, machining, threading, fabrication and testing all handled at our own Mumbai facility.
Original mill certificates plus our own test reports, so every batch can be traced back.
Non-standard sizes and specifications made to order.
Dispatched from Mumbai to every major Indian city, and exported to USA, Gulf, Europe, Asia
A super duplex steel flange is a forged or machined piping component made from a high-alloy duplex stainless steel with a ferrite-austenite microstructure. It provides higher strength and better chloride corrosion resistance than many conventional stainless steel grades.
Amigo Impex supplies Super Duplex S32750 (UNS S32750 / F53) and Super Duplex S32760 (UNS S32760 / F55) flanges.
Super duplex flanges are available from NPS 1/2" to 24" under ASME B16.5 and from NPS 26" to 60" under ASME B16.47. Non-standard sizes, drilling and dimensions can be produced against an approved drawing.
Applicable ASME pressure classes include Class 150, 300, 400, 600, 900, 1500 and 2500. The available class depends on the flange size and governing dimensional standard.
Yes. Super duplex stainless steel contains a significant ferritic phase, which makes the material magnetic. Magnetic response alone, however, cannot be used to confirm the exact grade; material identification should be based on the heat number and certification.
Yes, non-standard bore dimensions, thicknesses and drilling patterns can be machined or produced against a customer drawing, subject to material and manufacturing feasibility.
Yes, Amigo Impex exports super duplex steel flanges from Mumbai to customers in the USA, Gulf, European and Asian markets. Export orders are supplied with the required material certification and export packing.
The combination of high strength and chloride corrosion resistance makes super duplex flanges suitable for demanding applications across several industries:
