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Duplex tube manufacturer in India

Duplex Tube What is a Duplex Tube?

It is a go-to material for industries demanding strength, corrosion resistance, and long service duration. A duplex tube has a microstructure comprising both austenitic and ferritic grades in equal proportions (50% each). It makes a DSS tube resistant to cracking in chloride solutions. Seawater handling industries, pulp and paper manufacturing, and heat exchangers use this tubing.

Duplex seamless tubes supplier in Mumbai

The competitive advantages and differentiation of Manifest Alloys in supplying a DSS tube in Mumbai, India

As a reputed supplier of duplex tubing, we ensure high-quality standards and trusted sourcing. We take pride in a strict quality-control system to guarantee customer satisfaction.

Our duplex seamless tube is attractively priced and delivered promptly, making us a provider that prioritizes client needs and affordability.


Specification of duplex tube

Standard Duplex steel tubing dimensions DSS tube thickness
  • AISI
  • JIS
  • EN
  • GB
  • ASME
  • ASTM
  • DIN
  • Seamles tube: 1mm up to 45mm (0.04″ to 1 5/8”)
  • Welded tube: up to 38.1mm / 1 1/2″OD
  • Size: 6” to 24”
  • 0.3mm to 50 mm
Duplex annealed tube temperature range Stainless steel duplex square tubing density DSS exhaust tubing melting point
  • Above 250 °C
  • 7.8g/cm3
  • 1350°C
Duplex SS seamless schedules Duplex alloy welded tube end Duplex stainless steel tube types
  • Schedule 5
  • 10
  • XS
  • 40
  • XXS
  • 80
  • 80S,
  • 160
  • Plain
  • Beveled
  • Treaded
  • Seamless tube
  • Welded tube
  • ERW tube
  • Square tube
  • EFW tube

We are top duplex steel seamless tube stockist in India, check our largest inventory of UNS S31803 tubing

The properties and benefits of duplex tubing compared to other types of tubing materials

A DSS welded tube can handle abrasive agents like chlorides much better than regular stainless steel. It can also manage temperatures of up to 150 °C.

Another significant benefit is good strength relative to the pricing. It is lightweight and flexible because of nickel, and thus easy to ship.

We transported DSS tubes to Venezuela, Colombia, Ecuador, and Guyana in 10 days.

Types of DSS tubes


Duplex steel seamless tube

Duplex steel seamless tube

DSS welded tube

DSS welded tube

Duplex alloy annealed tube

Duplex alloy annealed tube

Stainless steel duplex extruded tube

Stainless steel duplex extruded tube

Duplex SS redrawn tube

Duplex SS redrawn tube

Duplex stainless square tubing

Duplex stainless square tubing

DSS exhaust tubing

DSS exhaust tubing

Duplex alloy condenser tubes

Duplex alloy condenser tubes

DSS heat exchanger tube

DSS heat exchanger tube

Duplex boiler tube

Duplex boiler tube

SS duplex superheater tubes

SS duplex superheater tubes

Duplex precision tubes

Duplex precision tubes

Duplex SS hydraulic tubing

Duplex SS hydraulic tubing

Stainless steel duplex capillary tubing

Stainless steel duplex capillary tubing

To ensure the robustness and durability of our duplex steel tube and DSS superheater tubes, we utilize a variety of testing techniques

What are the common testing methods used to evaluate the robustness and durability of duplex steel tubes?

A duplex steel tube undergoes non-destructive testing (NDT) to meet desired properties and chemical composition. The typical methods are radiography, ultrasonic testing, and Eddy Current. Manufacturers also perform magnetic particle inspection, dye penetrant testing, or a third-party check for a DSS boiler tube.

Chemical composition of DSS ERW tube


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
We are stainless steel duplex heat exchanger tube manufacturer, our dss square tubing are providing additional corrosion and wear resistance.

What are the key features of duplex heat exchanger tubes that contribute to their additional corrosion and wear resistance?

Heat exchangers are prone to corrosion from impingement, vibration, temperature changes, etc. DSS heat exchanger tubes are a good fit, benefitting from austenitic and ferrite grades. They contain more chromium, molybdenum, and nitrogen than stainless steel. These additions make it rust-proof and damage resistant. Thermally stable DSS superheater tubes can handle temperatures up to 316°C.

Duplex tube stock sizes


Duplex tube sizes

Mechanical properties of duplex seamless tube


Grade % Elongation YS (MPa) Hardness(BHN) UTS (MPa)
S31803 25 min. 450 min. 293 max. 620 min.

Do you want to buy DSS boiler tube and duplex steel welded tubes? Examine the Manifest Alloys grades and price list

How does the price of duplex steel tube and DSS ERW tube, vary by grade and size?

Prices vary by dimensions – outer diameter and wall thickness – and grade. DSS ERW tubing costs around Rs 300 to Rs. 450 per kilogram. Grade 2304 is cheaper than 2205 since it has less nickel (4% vs 5-6%). The latter also has more molybdenum and shows better corrosion resistance.

Equivalent grade of duplex steel welded tube


STANDARD WERKSTOFF NR. UNS
Duplex 1.4462 S31803 / S32205

Duplex tubing surface finishes


Surface Finish DSS tube exterbal surface Duplex tubing internal surface
Roughness average(RA) Roughness average(RA)
μm μ inch μm μ inch
BA Beight Annealed 0.8 32 1.0,0.8,0.6,0.5 40,32,25,20
EP Electro Polish 0.8 32 0.38,0.25,0.20;0.13 15,10,7,5
AP Annealed & Pickled 1.0 or Not defined 40 or Not defined Not defined Not defined
MP Mechanical Polish 0.8 32 1.0,0.8,0.6,0.5 40,32,25,20
 

Duplex stainless steel seamles tube standards

  • EN 10216 – 5
  • ASME B36.19M
  • EN 10088-3
  • EN 10217-7
  • EN 10088-2
  • NSF 61
  • ASME B36.19
  • DIN 17456
  • EN 10216 – 2
  • DIN 17458
 
Duplex tubing surface finishes

Size chart of DSS tubes


Tube Types Out diameter Sizes Length
Seamless Tube 6.35 mm OD To 101.6 mm OD As per requirement Cut to length
NB Sizes .0035” ~ 8” 1/8", 1/4", 3/8", 1/2", 5/8", 3/4", 1", 1.25", 1.5", 2", 2.5", 3", 4", 5", 6" Cut to length
Welded Tube / ERW Tube 6.35 mm OD - 152 mm OD As per requirement Cut to length