Duplex Steel Pipe Fittings


Reliable Pipes and Tubes Ltd. is a leading manufacturer, exporter and supplier of buttweld seamless and welded duplex fittings, duplex flanges and duplex pipes. RELIABLE PIPES & TUBES LTD. 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 steel pipe fittings
Duplex Steel Pipe Fittings
Duplex steel pipe flanges
Duplex Steel Pipe Flanges
Duplex steel forged fittings
Duplex Steel Forged Fittings

DUPLEX PIPE BENDS, DUPLEX ELBOW, DUPLEX TEE, DUPLEX REDUCER, DUPLEX STUB END, Duplex Socket weld & Threaded Fittings Supplier in India.

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.

RELIABLE PIPES & TUBES LTD. 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.

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

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 48″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 Steel Elbows – Long Radius Duplex Steel Stub Ends Sizes 1/2″ – 48″
Duplex Steel Elbows – Short Radius Duplex Steel Crosses
Duplex Steel Reducing Elbows Duplex Steel Reducing Crosses
Duplex Steel 45° Elbows Duplex Steel 180° LR Return Bends
Duplex Steel Tees Duplex Steel 180° SR Return Bends
Duplex Equal Tees Duplex Steel Pipe Bends / Piggable Bends
Duplex Steel Reducers Duplex Steel Couplings
Duplex Steel Concentric Reducers Duplex Steel Pipe Nipples
Duplex Steel Eccentric Reducers Duplex Steel Forged/Plate Cut Rings
Duplex Steel 3D Elbow Duplex Steel End Caps
Duplex Steel 5D Elbow Duplex Steel Forged / Plate Circles


High Pressure Forged Duplex Steel Pipe Fittings

Threaded and Socket Weld Pipe Fittings

Products Size
Duplex Steel 90° Elbows Duplex Steel Couplings Sizes 1/8″ – 4″
Pressure Ratings –
2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS
Duplex Steel 45° Elbows Duplex Steel Reducers
Duplex Steel Street Elbows Duplex Steel Inserts
Duplex Steel Tees Duplex Steel Caps
Duplex Steel Crosses Duplex Steel Unions


Duplex Steel Flanges

Forged and Plate Flanges

Specification ASTM A182 / ASME SA182 F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61.
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.


Product Size
Duplex Steel Slip-On Flanges Duplex Steel Threaded Flanges 1/8″ – 36″
Raised Face or Flat Face
Duplex Steel Weld Neck Flanges Duplex Steel Socket Weld Flanges
Duplex Steel Blind Flanges Duplex Steel Reducing Flanges
Duplex Steel Lap Joint Flanges Duplex Steel Plate Flanges