Duplex Steel Tube Fittings

Duplex Tube Fittings Manufacturer & Supplier in India

Kalpataru Piping Solution is a prominent manufacturer and distributor of duplex tube fittings that offers high-performance solutions, which are reputable within the major industries. Duplex Steel tube fittings are designed using the finest duplex stainless steel, with exceptional strength, corrosion resistance and life. Duplex steel fittings and duplex steel S31803 tube fittings are the best choice of fittings in the system subject to high pressure, aggressive chemicals, and variable temperatures due to the dual-phase structure that offers a superior level of resistance to stress corrosion cracking.

We provide a broad selection of duplex steel tube fittings of different sizes, configurations, and end connections to suit different instrumentation and piping requirements. Every fitting is designed to be very specific so that it can be leak free, fit in the correct dimension, and last long, even under the most challenging of operating conditions. Whether it is chemical processing and oil and gas or marine and power generation, our fittings are consistent and reliable in their performance.

Kalpataru Piping Solution is a reputable brand in the piping industry across the world because it is highly quality-driven, has high production capacity and is customer-orientated in its service delivery. In the projects where there is a strong need for duplex tube fittings that are corrosion resistant, efficient and strong, we offer international standards of fittings that are well beyond expectations.

Types of Duplex 2205 Tube Fittings

Duplex Stainless Bushing

Duplex Stainless Bushing

Duplex Stainless Male Bulkhead Connector

Duplex Stainless Male Bulkhead Connector

Duplex Stainless Steel Female Connector

Duplex Stainless Steel Female Connector

Duplex Stainless Steel Hex Nipple

Duplex Stainless Steel Hex Nipple

Duplex Steel Hex Coupling

Duplex Steel Hex Coupling

Duplex Steel Tube Union

Duplex Steel Tube Union

Stainless Steel Duplex Blanking Plug

Stainless Steel Duplex Blanking Plug

Stainless Steel Duplex Male Elbow

Stainless Steel Duplex Male Elbow

Stainless Steel Duplex Plug

Stainless Steel Duplex Plug

DSS Blanking End

DSS Blanking End

DSS Female Run Tee

DSS Female Run Tee

Duplex Allen Key

Duplex Allen Key

Duplex Female Elbow

Duplex Female Elbow

Duplex SS Cap

Duplex SS Cap

Duplex SS Union Ball Joint

Duplex SS Union Ball Joint

Duplex Stainless Back Ferrule

Duplex Stainless Back Ferrule

Specification of Duplex Tube Fittings

Specification

ASTM A276, ASTM A182

ASME SA479, ASME SA182

Tube Size

1/16 OD to 2 OD, Od to 50mm OD

Type

Seamless/ Welded/Fabricated

Equivalent

PARKER, SWAGELOK, HOKE, DK-LOK

Thread

BSPT, UNF, SAE, BSP, NPT, ISO, etc.

Material Grades

Duplex 2205
Duplex S31803
Duplex S32205

PTFE Standard

ASTM D1710 and D3294

Pressure Rating

1000/300/6000/3000/10000 PSI for Duplex Steel

Temperature

150-400°C

PACKING DETAIL

size of the wooden box – 38*27*17CM

size of carton – 21*16*14CM/31*21*16CM/36*45*50CM

Duplex 2205 Tube Fittings Equivalent Material

ASTMUNSENASMEWNRBSISOAFNORGOSTAVESTASHEFFIELD
A276/ A479 / A182S31803 / S322051.4462 – X2CrNiMoN22-5-3SUS 329J3L1.4462318S13 – 318 S 13CrNiMo22-5-3 – CrNiMo 22-5-3Z3CND22-05AZ – Z 3 CND 22-05 Az02Ch22N5M3 – 02Х22Н5АМ3SAF 2205

UNS S31803 DSS Instrumentation Tube Fittings Chemical Composition

Material C Mn Si P S Cr Mo Ni N Fe
Duplex 2205 0.30 max 2.00 max 1.00 max 0.30 max 0.20 max 22.0-23.0 3.00-3.5 4.50 – 6.50 0.14 – 0.20 63.72 min

Mechanical Properties of ASTM A815 Duplex Steel Tube Fittings

Grade Density Density Melting Point (°C) Melting Point (°F)
S31803 / S32205 7.805 0.285 1420 – 1465 2588 – 2669

Dimension of Duplex Tube Fittings

Threads Dimension of BSPP and BSPT
SIZEPITCH & SIZEOD THREADOD THREADID THREADID Thread
DASHBSPP & BSPTMALE BSPTMALE BSPPFEMALE BSPTFEMALE BSPP
 Inch to TPImminchmminchmminchmminch
-41/4 to 1912,80.513,00.5111,20.4411,90.47
-21/8 to 289,50.379,60.388,40.338,60.34
-63/8 to 1916,30.6416,50.6514,70.5915,20.6
-105/8 to 1422,50.8922,80.920,60.8120,80.82
-81/2 to 1420,40.820,80.8218,30.7219,10.75
-123/4 to 1425,91.0226,31.0423,90.9424,60.97
-201.1/4 to 1141,11.6241,81.6438,61.5239,41.55
-161 to 1132,61.2833,11.329,71.1730,71.21
-241.1/2 to 1147,01.8547,71.8844,51.7545,51.79
-402.1/2 to 1174,12.9275,12.9571,92.8372,62.86
-322(11)58,62.3159,52.3456,42.2257,42.26
-483 to 1186,63.4187,93.4684,63.3385,43.36

Pressure Rating of Duplex Stainless Steel Female Connector

Tube O.D in   4-Jan 8-Mar 2-Jan 8-May 4-Mar
Tube Wall Thickness , in . 0.035 Working Pressure, psig(bar) 10000(690) 6500(450) 5000(350)
0.049 15000(1040) 10100(700) 7200(500) 5800(400) 4700(330)
0.065 12700(880) 10100(700) 7600(530) 6300(440)
0.083 12900(890) 10100(700) 8500(590)
0.095 10000(690)

Duplex Stainless Male Bulkhead Connector Installation

Installation description Type
  • NPT
  • UNF
  • BSPT
  • 3000-6000 Psig pressure
  • Double Ferrule
Duplex Stainless Branch Reducing Tee
  • Double Ferrule
  • 3000-6000 Psig pressure
  • UNF
  • NPT
  • BSPT
Stainless Steel Duplex Bulkhead Union
  • Double Ferrule
  • 3000-10000 PSI pressure
  • Port Size: 1/16″ to 1 1/2”
DSS Tube Nuts
  • Metric
  • NPT
  • Threaded
  • BSP
  • JIC
Duplex SS Male Street Tee
  • Sleeve Type
  • Metric thread
  • Single Ferrule
Stainless Steel Duplex Bulkhead Union Elbow
  • Single Ferrule
  • Sleeve Type
  • Metric thread
DSS Cross
  • Male To Female
  • Round head
  • Threaded
Duplex SS Street Elbow
  • Round head
  • Threaded
ASTM A182 Duplex Steel Female Thread Elbow
  • Round head
  • Threaded
ASTM A276 Duplex Female Run Tee

Duplex Female Elbow Thread I.D

BSPP Female Thread I.D
inch mm
3.36 85,4
0.97 24,6
1.21 30,7
0.75 19,1
2.26 57,4
2.86 72,6
0.6 15,2
1.55 39,4
0.82 20,8
1.79 45,5
0.34 8,6
0.47 11,9

Stainless Steel Duplex Male Elbow Thread O.D

BSPT Male Thread O.D
inch mm
1.28 32,6
1.62 41,1
1.85 47,0
0.37 9,5
0.5 12,8
0.64 16,3
0.8 20,4
0.89 22,5
2.92 74,1
3.41 86,6
1.02 25,9
2.31 58,6

Features and Benefits of Duplex Tube Fittings

The duplex tube fittings which have been very popular in industries, as they have unparalleled mechanical strength and longevity. Our offerings at Kalpataru Piping Solution are the best assortment of duplex steel tube fittings that would provide durability, dependability, and regular operation even under the most demanding working conditions.

  • Unsurpassed Corrosion Protection:These fittings are manufactured using high-grade duplex stainless steel and thus resist corrosion, pitting and atmospheres conducive to chloride corrosion. This is why they are a reliable choice regarding oil & gas, chemical plants, desalination systems, and use in the sea.
  • High Mechanical Strength:The duplex steel offers a special strength benefit; that is, the fittings can work effectively with high pressure and heavy loading without any failure of system integrity.
  • Impressive Toughness:Balanced microstructure in the material provides the fittings with high toughness and thus the ability to resist impact and vibration as well as abrupt changes in pressure.
  • Large operating temperature span:Our duplex tube fittings are also stable at very low and high temperatures, which makes them applicable in a wide range of industrial conditions.
  • Versatile Usage:These fittings are offered in various sizes, end connections, and configurations that could be used in joining, branching, and connecting the tubing to different systems.
  • Precision-Crafted Design:All the fittings are made to the highest degree of accuracy to allow the fittings to align properly, fit correctly and contain no leaks.
  • Simple Installation:The fittings also have a range of thread choices and connection styles that contribute to the quickness of installation, which allows saving time and effort spent on the task.
  • Long Service Life:They have a strong construction and can withstand corrosion; thus, they last long with little or no maintenance.
  • Standards-Compliant:Every duplex tube fitting corresponds to key international standards, which guarantee reliable quality usage internationally.
  • Leak-Proof Performance:The fittings are designed in such a way that they provide tight sealing, and therefore leakage is avoided and system efficiency is maintained.
  • Cost-Effective Efficiency:The duplex tube fittings are of high quality with end features and are very economical in terms of costs of downtime and long-term maintenance.

Applications of Duplex Tube Fittings

Duplex tube fittings are widely used across industries that demand high strength, corrosion resistance, and reliable performance. Their dual-phase structure makes them suitable for handling aggressive media and high-pressure conditions. Key applications include:

  • Oil & Gas Industry: Used in offshore platforms, subsea pipelines, wellhead systems, and processing units where resistance to chloride stress corrosion is crucial. 
  • Chemical & Petrochemical Plants: Ideal for corrosive chemical lines, high-temperature processing units, and acid-handling systems.
  • Marine & Shipbuilding: Suitable for seawater cooling systems, ballast systems, and marine engineering applications due to excellent resistance to saltwater environments.
  • Power Generation: Used in heat exchangers, boilers, steam systems, and turbine piping for high-temperature and high-pressure stability.
  • Desalination & Water Treatment: Perfect for brine handling, filtration units, and high-salinity water processing systems.
  • Pharmaceutical & Food Processing: Applied in hygienic fluid handling, high-purity piping, and sanitary processing lines where contamination-free operation is needed.
  • Pulp & Paper Industry: Used in bleaching plants and chemical recovery units because of their strong resistance to corrosive chemicals.
  • Instrumentation & Control Systems: Ensures precise flow control and leak-proof connections in measurement and monitoring systems.

FAQs about Duplex Tube Fittings

Duplex tube fittings are precision-engineered components made from duplex stainless steel, designed for secure and leak-proof tube connections in high-pressure and corrosive environments.

They are widely used in oil & gas, chemical processing, marine, desalination, power generation, and instrumentation systems.

Absolutely. Duplex Tube Fittings are designed to withstand high pressure, mechanical stress, and fluctuating loads.

No, their corrosion-resistant structure ensures longer service life with minimal maintenance.