Duplex Stainless Steel Tube

Duplex Stainless Steel Seamless Tube

Duplex Stainless Steel Tube

Duplex Stainless Steel Tube is a type of metallic tube that is used in applications that need metallic pipes and tubing. These are used in different industries like in the medical, chemical, petrochemical, pharmaceutical, marine and electric industries. Naman Pipe & Tubes is a proud manufacturer of different Seamless Duplex Tubes and accessories. As one of the leading DSS Tube suppliers we produce the tubing in many different varieties, sizes and shapes. There are seamless tubes, Welded Tubes, heat treated, electroplated and other types of tubes that are used in different purposes.

The main role of DSS is that it has strength from its ferritic structure and has high corrosion stress resistance from its austenitic structure. The combination makes these tubes be used in some of the sophisticated elevated temperature service applications such as the DSS Heat Exchanger Tubes. Our products are used in several industrial applications with different requirements. The Duplex Tubing can be of various shapes such as round, oval, square, rectangular or hexagonal. We also produce and sell specific types such as the DSS Furcation Tubing which is a compact packing of several tubes together for special applications. You can contact us for all your Tubing needs and we will deliver you with the highest of quality tubes.

Sizes of Duplex Stainless Steel Tube

Outside Diameter

5.8-1219mm (0.23"-48")

Wall Thickness

1-50.8mm (0.04"-2")


1m to 12m or custom


Cold Drawn, Cold Rolled

Duplex Tubes Specification

Standard Specification ASTM A789 ASME SA 789
Manufacturing Standard DIN, ISO, GB, JIS, BA, ANSI, AISI, BS, EN
Material UNS S31803, S32205
Common types Seamless / ERW/ Welded / DOM / EFW / Fabricated / CDW / CEW
Specialized in Coiled Tubing, U Bend Tubes for Heat Exchangers, Capilary Tubing
End Types Plain End, Beveled End, Treaded
Length Single Random, Double Random & Cut Length.
DSS Tube Color Nickel White
Surface Finish Types Fine
Trade Terms
  • FOB
  • CFR
  • CIF
  • EXW
Approvals NACE MR 0175

Types of Duplex Tubing

ASTM A789 Duplex Stainless Steel Tubing

ASTM A789 Duplex Stainless Steel Tubing

  • Duplex Stainless Steel Heat Exchanger Tubes
  • Round/ Square/ Elliptical/ DSS Tubing
  • Big Diameter Duplex Steel Tubing
Cold Drawn Duplex Stainless Steel Round Tube

Cold Drawn Duplex Stainless Steel Round Tube

  • DSS Tubes for Oil and Chemical Industry
  • ASME SA789 Steel Tubes
  • Seamless Duplex Tubes

Seamless Duplex Tubes Price List

Product Name Price in INR
DSS Round tube - (material -S32101 ) Length 10.05 M) INR 280 Per Unit

Available Grades

ASTM Specification ASME Specification Seamless/ Welded Tubing
ASTM A789 SA 789 UNS S31803
ASTM A789 SA 789 UNS S32205
ASTM A789 SA 789 Duplex 2205

Why Duplex Tubes are used in Heat exchangers and superheaters?

Heat exchangers and super heaters are applications which operate under elevated temperatures. The pipes used in these applications should withstand high temperatures. With the high temperatures comes the oxidation risk. So the pipes that are used in these applications should be able to withstand high temperatures, at the same time not be oxidized. The duplex steel grades have high operating temperatures up to 475 degrees in general and they are oxidation resistant at high temperatures. So the duplex stainless steels are appropriate for high temperature applications and they are used in heat exchangers and in super heaters.

Chemical properties of seamless & welded tubing

UNS Chemical Composition %
Ni Cr Mo N Cu Others
UNS S31803 00.03 2 00.03 00.02 1 4.5-6.5 21.0-23.0 2.5-3.5 00.08-00.20 . . . . . .
UNS S32205 00.03 2 00.03 00.02 1 4.5-6.5 22-23 3.0-3.5 00.14-00.20 . . . . . .

DSS tubing temperature limit

Alloy 2205 Temperature Range Quench Info
UNS S31803 1020-1100°C (1870-2010 °F) Rapid cooling in water/ air
UNS S32205 1020-1100°C (1870-2010 °F) Rapid cooling in water/ air

DSS Tubes Mechanical Strength

SS 2205 Tensile Stress, min., ksi [MPa] Yield Stress, min., ksi [MPa] Elongation in 2 in., or 50mm, min, % Hardness, Maximum Brinell
UNS S31803 90 Ksi [620MPa] 65 Ksi [450MPa] 25 290
UNS S32205 95 Ksi [655MPa] 70 Ksi [485MPa] 25 290