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Duplex pipe fittings

Duplex pipe fittings

What are duplex pipe fittings?

These high-strength, durable components have a two-phase microstructure comprising both ferritic and austenitic grades of stainless steel. Duplex pipe fittings contain chromium (22%), nickel (5-6%) and up to 3% molybdenum. They can adapt well to challenging conditions in chemical processing industries, petrochemicals, power plants, and offshore refineries.

Buyers can purchase these piping components in various types to manage and alter the fluid direction. For example, a duplex elbow can bring a 90-degree directional change. You can also procure reducers, bends, etc., manufactured from this resilient material.

We deliver DSS butt weld fittings to the UAE, Syria, Cyprus, and Yemen in 7-10 days.

DSS elbow manufacturer in India


Specification of duplex pipe fittings

DSS buttweld fittings sizes Duplex steel elbow thickness tolerance Duplex alloy weld fittings strength
  • Seamless fittings : 1/2" - 24"
  • Welded fittings : 24 - 96"
  • Fabricated fittings : custom
  • 87.5%
  • Tensile stress: 800 MPa
  • Yield strength: 550 MPa
Duplex SS seamless pipe fittings manufacturing technique Duplex metal tee temperature Ends of DSS buttweld fittings 
  • Mandrel
  • Hot forming
  • 300°C
  • Plain Bevel
  • Bevelled
  • Compound Bevel
Stainless steel duplex reducer schedules Duplex alloy weld fittings GOST standard Duplex SS bend radius
  • SCH 60
  • SCH 80
  • SCH 160
  • SCH 10
  • SCH 40
  • XXH
  • SCH 20
  • STD
  • XH
  • GOST 17378
  • GOST 17379
  • GOST 17376
  • GOST 17375
  • GOST 17375
  • 4D
  • 8D
  • 5D
  • 10D
  • 6D
  • 3D

We are a reliable and durable duplex steel buttweld fittings supplier in India, we offer a wide range of duplex SS tee to various industries

Can duplex fittings be used in high-temperature and corrosive environments?

Industries exposed to extreme temperatures, pressures, and abrasive agents can benefit from duplex stainless steel pipe fittings. They exhibit excellent resistance to corrosive agents like saltwater and resist stress corrosion cracking (SCC) amid chlorides.

DSS buttweld fittings can endure elevated temperatures of 950 to 1150°C. Their strength and toughness do not diminish under pressures of 3000 to 10,000 psi.

Understandably, a DSS end cap frequently gets used in marine environments, pollution control

Types of duplex stainless steel buttweld fittings


Duplex steel reducer

Duplex steel reducer

 DSS cap

DSS cap

 Duplex steel elbow

Duplex steel elbow

 Duplex metal tee

Duplex metal tee

Duplex SS stub end

Duplex SS stub end

Duplex pipe bend

Duplex pipe bend

Duplex stainless steel cross

Duplex stainless steel cross

We are top creator of duplex stainless steel reducer in Mumbai, view pressure class and dimensions

How does the testing process ensure that duplex fittings meet industry standards?

Adequate testing of a duplex steel fitting ascertains its fitness for a specific application. Manufacturers use both non-destructive testing or NDT techniques and manipulative methods to check the properties of a duplex steel stub end.

The standard NDT processes involve ultrasonic examination, hydrostatic testing, radiography, magnetic particle inspection, and Eddy current testing. . Properties like testing tensile strength, hardness, flattening, and impact resistance of a DSS tee are crucial for critical industries. Usually, the hardness gets tested per Brinell, Rockwell, or Vickers standards. Occasionally, further tests may get commissioned for a DSS pipe bend, like magnetic leakage flux testing, dye penetrant tests, Charpy Impact testing, or a third-party inspection.

Manufacturers sum test results in the related documentation, like the Mill Test Certificate. It ensures that a DSS reducer adheres to industry standards and guarantees compliance for your application.

Chemical composition of duplex steel reducer


Mo C Mn Cr Ni Si P S N Fe
3.00-3.50
.030 Max
2.00 Max
22.0-23.0
4.50-6.50
1.00 Max
.030 Max
.020 Max
0.14-0.20
Balance

Duplex stainless steel pipe fittings standards


Duplex stainless steel pipe fittings standards
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Mechanical properties of DSS elbow


Grade % Elongation YS (MPa) Hardness(BHN) UTS (MPa)
S31803 25 min. 450 min. 293 max. 620 min.
With us get ASTM A815 DSS stub end chemical composition and equivalent properties online

Equivalent grade of duplex tee


STANDARD WERKSTOFF NR. UNS
Duplex 1.4462 S31803 / S32205

DSS weld fittings physical properties


Physical Property Thermal Conductivity Modulus of Elasticity Electrical Resistivity Density Thermal Expansion
Value 19.0 W/m.K 200 GPa 0.85 x10^-6 Ω .m 7.805 g/cm³ 13.7 x10^-6 /K

Finding for reliable duplex butt weld fittings manufacturer in India?, for detail information, check our specification table

Useful informations of duplex pipe fittings


Duplex pipe fittings useful information

Temperature range of DSS buttweld fittings


Units 100°C 20°C 300°C 200°C
Linear expansion (RT ➞ T)°C x 10-6/°C 13 - 14 13.5
Density g/cm³ - 7.8 - -
lb/in³ - 0.28 - -
Thermal conductivity W/m°C 16 15 18 17
Btu/h ft°F - 8.7 - -
Thermal capacity J/kg°C 530 500 590 560
Modulus of elasticity GPa 194 200 180 186
psi x 10-6 - 29 - -
Electric resistivity µΩm 0.85 0.8 1 0.9
Poissons ratio - 0.3 - -

Dimensions of duplex stainless steel fittings


Nominal fitting size All fittings Duplex fittings Elbow & tees 180° return bend Reducers 180° return bend Caps 180° return bend
NPS I.D. at End
(1), (3), (4)
O.D. at Bevel (1), (2) Centre to end dimension Centre to centre Overall length Back to face Overall length Alignment of ends
3 to 3 1/2 0.06 0.06 0.06 0.25 0.06 0.25 0.12 0.03
1/2 to 2 1/2 0.03 0.06
-0.03
0.06 0.25 0.06 0.25 0.12 0.03
4 0.06 0.06 0.06 0.25 0.06 0.25 0.12 0.03
10 to 18 0.12 0.16
-0.12
0.09 0.38 0.09 0.25 0.25 0.06
5 to 8 0.06 0.09
-0.06
0.06 0.25 0.06 0.25 0.25 0.03
20 to 24 0.19 0.25
-0.19
0.09 0.38 0.09 0.25 0.25 0.06
32 to 48 0.19 0.25
-0.19
0.19 0.19 0.38
26 to 30 0.19 0.25
-0.19
0.12 0.19 0.38

Applications of duplex steel pipe fittings

Duplex steel pipe fittings applications

Pressuer ratings of DSS pipe bend


NPS
(in)
OD
(in)
Temperature
500 400 300 200 100
1 1/2" 1.900 1404 1512 1629 1629 1629
1.900 1986 2138 2303 2303 2303
1.900 2899 3120 3362 3362 3362
1" 1.315 1902 2047 2205 2205 2205
1.315 2640 2841 3061 3061 3061
1.315 3874 4170 4493 4493 4493
2" 2.375 1182 1272 1371 1371 1371
2.375 1712 1843 1985 1985 1985
2.375 2831 3047 3283 3283 3283
3" 3.500 1122 1208 1301 1301 1301
3.500 1590 1712 1844 1844 1844
3.500 2403 2587 2787 2787 2787
5" 5.563 832 896 965 965 965
5.563 1231 1325 1428 1428 1428
5.563 2133 2296 2474 2474 2474
4" 4.500 950 1023 1102 1102 1102
4.500 1377 1482 1596 1596 1596
4.500 2552 2424 2611 2611 2611
6" 6.625 756 814 877 877 877
6.625 1189 1280 1379 1379 1379
6.625 2054 2211 2382 2382 2382
10" 10.750 603 649 699 699 699
10.750 999 1075 1159 1159 1159
10.750 1974 2124 2289 2289 2289
8" 8.625 665 716 771 771 771
8.625 1050 1131 1218 1218 1218
8.625 1982 2133 2298 2298 2298