Super duplex tube

Super duplex tube

A super duplex tube or grade 2507 is a material with excellent corrosion resistance. It contains 25% chromium and 7% nickel.
A SDSS tubing contains two grades of metal: ferritic and austenitic. This combination infuses the product with superior metallurgical properties. It is stronger and more abrasion resistant than duplex grades and better at resisting pitting and cracking.
You can find super duplex tubing in oil and gas refiners, nuclear plants, chemical processing, etc. It gets regularly used in marine industries due to its inimitable performance in contact with seawater and salts.

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Super duplex seamless tube suppliers in UAE

Super duplex tube specification

Super Duplex Tube Specification

super duplex tubing dimensions Wall thickness Length
  • SDSS seamless tube OD:
    1mm up to 45mm (0.04″ to 1 5/8”)
  • SDSS welded, welded & drawn tubes OD:
    up to 38.1mm / 1 1/2″
  • Size: 6” to 24”
  • Super duplex tubes: 0.25 mm up to 6.35mm (0.01″ to 0.250″)

Call or chat with above stockists & manufacturers for shipping time of Saudi Arabia, UAE, Qatar, & Oman

  • Straight duplex tubing lengths : up to 14m (45ft)
  • SDSS coiled tubing: up to 10,000m (33,000 ft) with orbital joints

For custom length please contact above listed super duplex tube suppliers in UAE

Umbilical tubes Straight tubes Coiled tube
  • 3/8 to 2 inch
  • 1¾ to 5 inch
  • 1/8 to 30 inch NB
Required list of SDSS square tubing mechanical test American standard for OD and thickness Manufacturing process
  • Flange test (for sdss super duplex stainless steel welded tube)
  • Reverse flattening test
  • Hardness test
  • Flaring test (for super duplex alloy seamless tube)
  • 100% PMI tested
  • Tension test


  • ASTM A789 (Seamless/ welded)
  • ASTM A928 (EFW)
  • Hot Finished Seamless Tube
  • Cold Finished Seamless Tubes
European standard Applications & uses Manufacturing type
  • EN 10216-5 (seamless & welded tubing)
  • EN 10297-2 (seamless tubing)
  • EN 10312 (welded tubing)
  • EN 10217-7 (welded tubing)
  • EN 10296-2 (welded tubing)
  • 100% PMI tested
  • Fluid and gas transport
  • Chloride environments
  • Sea water
  • Seamless tubing
  • Welded tubing
  • ERW tubing
  • EFW tube
SDSS tubing wall thickness Meet standards Super duplex SS instrumentation tubing surface finish and treatments
  • 4 Inch
  • Schedule 5 / 5S
  • SCH 10
  • SCH 10S
  • SCH 20
  • SCH 30
  • SCH 40
  • SCH 40S
  • SCH 80 / 80S
  • SCH 120
  • SCH 160
  • Standard (SCH STD)
  • Ex-Standard (XS)
  • Double Extra Strong (XSS)
  • EN 10216 – 2
  • EN 10216 – 5
  • EN 10088-3
  • DIN 17458
  • NSF 61
  • DIN 17456
  • EN 10217-7
  • EN 10088-2
  • ASME B36.19
  • ASME B36.19M
  • Cleaned
  • Precleaned
  • Pickled
  • Passivated
SS super duplex square tubing finish QC and super duplex stainless steel heater tube supporting documents List of leading super duplex condenser tubes manufacturers
  • Bright Annealed
  • 400 grit
  • Solution annealed stainless super duplex tube
  • Matt finish
  • 180 grit polished
  • Mirror
  • 600 grit
  • No.4
  • Cold Drawn
  • 2B
  • BA polishing
  • Annealed & Pickled (A&P)
  • 320 grit

Refer these details before buying super duplex heater tube from manufacturers, suppliers, traders, stockholders, stockist, or importers

  • Detailed inspection of super duplex tubing like appearance, integrity, packaging etc
  • Labeling verification
  • Check dimensions
  • QC/ Inspection reports
  • Origin of material
  • MTC EN 10204 type 3.1
  • Schedule & size as per the work order

Check ex-stock of these make with above verified listed super duplex tube suppliers

  • ArcelorMittal, Luxembourg (Europe)
  • Outokumpu, Finland (Europe)
  • Aperam, Luxembourg (Europe)
  • ThyssenKrupp AG, Germany
  • Acerinox, Spain
  • Baosteel, China
  • POSCO, South Korea
  • Nippon Steel Corporation, Japan
  • Sandvik, Sweden
  • MACSTEEL, Gauteng (South Africa)
  • Tenaris, Luxembourg (Europe)
  • Tubecon, Pretoria (South Africa)
  • JFE, Japan
  • SMM Oman
  • Bristol Metals, USA
  • Nippon Steel & Sumitomo Metal Corporation, Japan
  • Sosta, Italy
  • AL JAZEERA, Oman
  • Nippon Yakin Kogyo Co., Ltd., Japan
  • Steelmor, Gauteng (South Africa)
SS super duplex square tubing value added services
  • Cutting
  • Beveling
  • Threading
  • Polishing

Unexpected price increases from your vendor? Get the fastest quotes from multiple super duplex tubing suppliers in Middle East countries

Equivalent standard of super duplex stainless steel tube

Chemical composition of super duplex steel tubes

S32750/S3260 min 0.5 24 6 3 0.24
max 1 26 8 1 0.03 5 2 0.03 0.35 0.35

Mechanical properties of super duplex tubing

Grade Yield strength Elongation Tensile strength Hardness, MAX
MPA ( in 50 mm) MPA HRB HB
2760/2750 550 15 % min 795 32 310

Super Duplex Tube Properties

Types and forms of super duplex tubes

Super duplex round tubing

Super duplex round tubing

Super duplex seamless tube

Super duplex seamless tube

Super duplex steel welded tube

Super duplex steel welded tube

Super duplex stainless steel redrawn tube

Super duplex stainless steel redrawn tube

Super duplex annealed tube

Super duplex annealed tube

SDSS square tubing

SDSS square tubing

  • Super duplex Coiled Tubing
  • SDSS Sanitary Tubing
  • Super duplex SS Instrumentation Tubing
  • SS super duplex Square Tubing
  • Exhaust Tubing
  • SDSS Rectangular Tubing
  • Super duplex stainless steel Mechanical Tubing
  • SDSS super duplex stainless steel Round Tube
  • Electropolish super duplex tubing
  • Stainless steel super duplex Bright annealed tube
  • Super duplex Hydraulic Tubing

Sizes of super duplex coiled tubing

ID Wall thickness (milimeter)
milimeter inch maximum minimum
9.53 3/8 2 1.2
12.70 1/2 2.6 1
15.88 5/8 3 1
19.05 3/4 4 1.1
25.40 1 5 1.3
31.75 5 1.5
38.10 5 2
44.45 5.5 1 2.5
50.80 2 6 1 2.7

Super duplex stainless steel straight tubes size range

ID Wall thickness (milimeter)
milimeter inch maximum minimum
44.45 8.00 2.50
50.80 2 8.00 2.80
57.15 9.00 3.20
63.50 8.00 3.50
69.85 8.00 4.00
76.20 3 10.00 4.30
82.55 8.00 4.60
88.90 12.00 4.90
95.25 9.00 5.30
101.60 4 14.00 5.50
114.30 16.00 6.30
127.00 5 18.00 7.00

Super duplex steel welded tube and redrawn tubing are available in round, square, or rectangular shapes

The prime benefit of this tubing is its above-par corrosion resistance. A corrosion test helps ascertain that the material delivers the expected properties. It is imperative for super duplex tube suppliers to conduct this test as such piping often gets used in critical applications like pharmaceuticals and chemical processing. Here safety is essential.
Corrosion tests typically get based on the service history and performance. You can also conduct an accelerated test to get quick results. Non-destructive testing includes ultrasonic and a scanning electron microscope (SEM). The former can detect internal flaws and changes in thickness. The latter is better at identifying micro-cracking and problems in molecular composition.

The most significant benefit is that this material is highly corrosion-resistant. It does not rust in the presence of abrasive chemicals. Super duplex material receives strength from the ferritic structure and corrosion resistance from the austenitic one. Super duplex grade condenser tubes can operate in versatile conditions and resist pitting and stress-induced cracking.

The abrasion handling of super duplex components is exemplary. A super duplex stainless steel redrawn tube can tolerate seawater, chlorides, acids, and other harsh media without facing deformation. This cost-efficient material resists stress-related cracking and is also stable. It proves to be a dependable solution for versatile industries without resorting to pricier alloys.

Super duplex grades display better corrosion resistance than duplex components. It can deliver improved performance in settings that get exposed to abrasive chemicals. Since it has high chromium content, its Pitting Resistance Equivalent Number or PREN is also high (over 40). It lends it better corrosion resistance than duplex components.

A super duplex seamless tube also displays more strength than a duplex. It has good weldability as well. However, neither duplex nor super duplex truly excels in weldability, which is why it shouldn’t be the prime consideration during procurement. One area where the duplex is better is the cost; super duplex components are more expensive and suited to larger budgets.

The quickest estimate can be acquired by live chatting with stockists and traders of the super duplex annealed tubes in GCC countries

This inexpensive test determines the impact toughness of the super duplex piping. The Charpy test on SDSS square tubing detects the capacity of a metal to tolerate a sudden load or shock. It refers to the amount of energy that gets absorbed during the impact. Duplex stainless steels contain both austenitic Ferritic steel has lowered impact toughness at low temperatures, turning brittle. Since SDSS tubes have ferritic microstructures, this test is essential to ensure the safety and reliability of the super duplex heat exchanger tubes.
During the test, a specimen gets struck by a weighted pendulum. The absorbed energy gets recorded. The Charpy test quickly tells you that the product is reliable and high-quality.

Discover reputable importers of SDSS square tubing and super duplex condenser tubes, who provide a broad selection for online purchasing to save money.

The superior chemical profile of this material makes it attractive to many industries. You can see a super duplex steel welded tube employed in petrochemicals, chemical processing, oil and gas refiners, etc. Its thermal properties make it a good fit for heat exchangers. A bulk of their applications lie in marine and subsea applications. This material delivers a long service life in seawater.
It performs well in hydraulic applications, instrumentation processes, marine industries, and offshore operations. A super duplex alloy annealed tube generally gets used for piping, fittings, flanges, etc. Heat exchangers, structural components, and cargo tanks also utilize this material.

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