Stainless Steel Tradename UNS no. Werkstoff No. Density (g/cm3)
Duplex F51 / 2205, F60 S31803 / S32205 1.4462 7.805


METLINE Industries is a leading manufacturer, exporter and supplier of buttweld seamless and welded duplex fittings, duplex flanges and duplex pipes. METLINE offers a complete range of duplex stainless steel pipe fittings such as duplex reducer, duplex elbow, duplex tee, duplex cross, duplex stub ends and duplex pipe bends. We are one of the few manufacturers in India who can weld, bend and form duplex stainless steel pipe fittings in various sizes and dimensions.

With a PREN of around 35, duplex stainless steels are generally more corrosion resistant than 304 (PREN: 19) and 316 stainless steels (PREN: 26), particularly stress corrosion cracking.

Duplex flanges can be manufactured and supplied in a variety of sizes and pressure ratings to meet project specific requirements of our customers. Our duplex pipe and fitting products are widely supplied to many industries including boiler manufacturing, brewing tanks and desalination plants.

Duplex stainless steel pipes and duplex fittings are generally lower in cost, as lower percentage of alloying element is used in the manufacture of duplex stainless steel. The yield strength of duplex stainless steel products is higher compared to austenitic stainless steel products, as a result of which users can purchase relatively lower thickness duplex pipes and duplex fittings.

METLINE also stocks and supplies a complete range of duplex seamless pipes to complement our existing production range of duplex buttweld fittings and flanges. Duplex pipes can be supplied in cut to length sizes and also machined or fabricated to meet your piping requirements.

Duplex Flanges Manufacturer/Supplier

Duplex Flanges Manufacturer/Supplier

Duplex Fittings Manufacturer/Supplier

Duplex Fittings Manufacturer/Supplier

Duplex Pipes Supplier/Stockholder

Duplex Pipes Supplier/Stockholder

Duplex Pipe Fittings Production Range

Specification ASTM A 815, ASME SA 815, ASTM A 182, ASME SA 182
Type Seamless / Welded / Fabricated
Range ½”NB to 24″NB in Sch 10S, 40S, 80S, 160s, XXS
Dimensions ANSI/ASME B16.9, B16.28, MSS-SP-43

Buttweld Duplex Pipe Fittings

Seamless/ Welded 100% Radiography Tested

Products Size
Duplex Elbows – Long Radius Duplex Stub Ends

Sizes 1/2″ – 48″

Duplex Elbows – Short Radius Duplex Crosses
Duplex Reducing Elbows Duplex Reducing Crosses
Duplex 45° Elbows Duplex 180° LR Return Bends
Duplex Tees Duplex 180° SR Return Bends
Duplex Fabricated Tees Duplex Pipe Bends / Piggable Bends
Duplex Reducers Duplex Couplings
Duplex Concentric Reducers Duplex Pipe Nipples
Duplex Eccentric Reducers Duplex Forged/Plate Cut Rings
Duplex 3D Elbow Duplex End Caps
Duplex 5D Elbow Duplex Forged / Plate Circles

High Pressure Forged Duplex Pipe Fittings

Threaded and Socket Weld Duplex Pipe Fittings

Products Size
Duplex 90° Elbows Duplex Couplings

Sizes 1/8″ – 4″

Pressure Ratings –
2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS

Duplex 45° Elbows Duplex Reducers
Duplex Street Elbows Duplex Inserts
Duplex Tees Duplex Caps
Duplex Crosses Duplex Unions

Stainless Steel Duplex Flanges

Forged and Plate Flanges

Specification ASTM A182 / ASME SA182 F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61.
UNS Grade UNS S31803, S32205, S2205, S32550, S32750, S32760.
Standard ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Size ½” to 24″
Dimensions ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Class / Pressure 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.


Products Size
Duplex Slip-On Flanges Duplex Threaded Flanges

1/8″ – 36″

Raised Face or Flat Face

Duplex Weld Neck Flanges Duplex Socket Weld Flanges
Duplex Blind Flanges Duplex Reducing Flanges
Duplex Lap Joint Flanges Duplex Plate Flanges

Marking & Packing

Products are packaged to ensure that there is no damage during transit. In case of exports, standard export packaging is done in wooden cases. All fittings and flanges are marked with Grade, Lot No, Size, Degree and our trade mark. On special requests we can also, make custom marking on our products.

Quality Assurance

At METLINE, all fittings and flanges are subject to strict inspection at each stage of the production process, from starting material purchasing to product dispatch. They are visually examined for conformity to ASTM, ASME, MSS, DIN, EN, and JIS codes and standards. Upon request, official certified Inspection Agencies can be called in to witness the material reports, dimensions and quality conformity of products.

Test Certificates: Manufacturer Test Certificate as per EN 10204 / 3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report

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Duplex Pipes, Fittings and Flanges Manufacturers, Suppliers
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