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Duplex Tube

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.

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.


Manufacturer of DSS Seamless Tubing in India, For More Details Check Specification

Specification of Duplex Tube


Duplex Tube Specification

Africa's favourite supplier ship to Nigeria with in 20 days

DSS Seamless Tubes Delivery Schedules


Country Name Madagascar Nigeria Ghana Kenya Angola
Delivery Time 15-20 in all

Supplier of Duplex Stainless Steel Welded Tube in Size Ranging From 6" to 24", Check Size Chart

Size Chart of Duplex SS Tubing


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

Duplex tube sizes

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

Get Duplex Steel Square Tube Bright, BA and Matt Finish as per ASME B36.19 Standard

Duplex Welded 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
 

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.

Check Stainless Steel Duplex Oval Tubing Chemical Composition and Equivalent Properties

Chemical Composition of Duplex Stainless Steel 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

Duplex Steel Welded Tube Equivalent Grade


STANDARD WERKSTOFF NR. UNS
Duplex 1.4462 S31803 / S32205

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.

Find Duplex SS Round Tubes in SCH5 to SCH 160 Schedules, Check Mechanical Properties

Duplex Seamless Tube Mechanical Properties


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

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.


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