Duplex Tube, Super Duplex Tube

Duplex Tube supplier, Duplex Steel Tube distributor, Super Duplex Seamless Tubing suppliers, check Duplex Tubing Price, Duplex Tube Stockist, Duplex Seamless Tube manufacturer in India.

Duplex Tube
Duplex Tube
Duplex Seamless Tube
Duplex Seamless Tube
Duplex Tubing
Duplex Tubing

Duplex Tubes are designed to provide better corrosion resistance, particularly chloride stress corrosion and chloride pitting corrosion, and higher strength than standard austenitic stainless steels such as Type 304 or 316. A 22%Cr duplex stainless steel Duplex Tube has a minimum 0.2% proof strength of some 450N/mm2 and Super Duplex Steel Tubing, a superduplex grade a minimum of 550N/mm2. Super Duplex Seamless Tube can be divided into three main groups; lean duplex Tube, 22%Cr Duplex Steel Seamless Tubing and 25%Cr superduplex Tubing, and even higher alloyed, hyperduplex grades have been developed, this division being based primarily on the alloy's alloying level, eg in terms of 'PREN' (pitting resistance equivalence number), a measure of the alloy's resistance to pitting corrosion. Duplex Stainless Steel Tube PREN is calculated from a simple formula: PREN = %Cr + 3.3%Mo +16%N and an allowance for W is sometimes made, having a factor of 1.65. A Duplex Seamless Tubing has a PREN less than 40; a (superduplex) Super Duplex Coiled Tubing a PREN between 40 and 45 and hyperduplex Tube a PREN above 45, whilst the lean grades typically have lower nickel and hence lower price.

We offer various sizes of Duplex and Super Duplex Stainless Steel Seamless Tube, Duplex Steel ERW Tubes & Duplex welded round tubes in duplex grade up to the biggest 4 inches in diameter in 20 feet long. Super Duplex Polish welded round tubes are available in bright polished finish. We supply Duplex welded square tubes up to the biggest 4 inches in wall opening in 20 feet long. Duplex welded square tubes are available in both bright polished and hairline finish. We also stock Duplex welded rectangular tubes up to the biggest 4 inches in wall opening in 20 feet long. Duplex welded rectangular tubes are available in both bright polished and hairline finish.

Steel Tubes India in renowned Manufacturer of Super Duplex Steel High Pressure Tube in India. We manufacture of all types on Super Duplex Oval Tube & Duplex Steel Seamless Tubes. We have supplied Duplex U bend Tubes to Gasco, Duplex Gas Tube to Saudi Aramco, Super Duplex boiler tubes to Oman, Super Duplex Seamless Pressure Tubing to KNPC, Super Duplex Tube & Super Duplex Coiled Tube to Qatar Gas, Super Duplex u tube to Dubai, Duplex Steel Instrumentation Tubes to leading oil & gas company in Iraq, Duplex Cold Rolled Coiled Tubing to South Africa, Duplex Steel EFW Tubes to North America, Duplex Steel Square Tubes to United Kingdom and Duplex Seamless Tubing to UAE. We have more than 14 years of experience in supplying Super Duplex Tubes & Duplex Tubing. Our highly experienced team can help you to buy right Super Duplex Tubes.

If you are looking to buy High quality assured Duplex capillary tube, Duplex Square Tubing or Duplex Polished Tube at best price in India, send an email to stindia@stindia.com, we will send you the Free Quote & recent price of Duplex precision tubes, Duplex Welded Tube, Duplex instrumentation tubes, Duplex Oval Tube along with inspection & delivery schedule. Steel Tubes India is a Govt. of India recognised Exporter of Duplex Mirror Tube in India and shipping to Europe, Trinidad & Tobago, Singapore, Qatar, Ethiopia, United Arab Emirates, Oman, Malaysia, Kuwait, Canada, Australia, United States, New Zealand, United Kingdom, St. Helena, South Africa, India, Nigeria, Ghana, Hong Kong, Saudi Arabia, Philippines, Ireland, Pakistan, South Korea, Iraq, Norway, Finland, Egypt, Netherlands, Denmark, Iran, Kenya, Sweden, Thailand, Indonesia, India, Belgium, Taiwan, Greece & Germany since 2002. Duplex Steel Needle Tube, Duplex Steel Round Tube and Duplex hydraulic tube are available in different sizes, diameter & wall thickness.

Looking to buy Alloy 625 Tube? Inconel 625 Tube?

Check price of Inconel 625 Tube in India

Inconel 625 Tube


Duplex Tube Price

Duplex Seamless Pipe Price/ ASTM A790 Duplex Seamless Pipe Price ($7190-$8500 USD/ TON)
Duplex Welded Pipe Price / ASTM A790 Duplex Welded Pipe Price ($7100-$8500 USD/ TON)
Duplex Alloy Pipe Price/ Alloy Price ($7200-$8500 USD/ TON)
Duplex Stainless Steel Pipe Price ($7180-$8500 USD/ TON)

Click here for complete (grade & size wise)

Supplier & stockist of Mirror Polished Duplex Steel Seamless Tube, exporter of Duplex Steel Welded Tube in India, Duplex Steel Tubing, Super Duplex Seamless Tubing suppliers, Duplex Steel Gas Tube in India, Duplex Boiler Tube trader, Duplex Exhaust Tube, Duplex Steel Exhaust Tubing Suppliers in Mumbai, India, stockholder of Duplex Coil Tube, Mirror Polished Duplex Square Tube suppliers, Super Duplex Capillary Tube Price in India.

Duplex Tube Specification

Duplex Tube Standards ASTM A789, ASME SA789
Duplex Seamless Tube Size 3.35 mm OD To 101.6 mm OD
Duplex Welded Tube Size 6.35 mm OD To 152 mm OD
Swg & Bwg 10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg.
Duplex tubing wall thickness 0.020" –0.220", (special wall thicknesses available)
Duplex Steel tube Length Single Random, Double Random, Standard & Cut length
Super Duplex Tube Finish Polished, AP (Annealed & Pickled), BA (Bright & Annealed), MF
Duplex tube Form Round, Coil, Square, Rectangular, Boiler, Hydraulic, Straight or ‘U’ bent Tubes, Hollow, LSAW Tubes Etc.
Duplex Tube Type Seamless, ERW, EFW, Welded, Fabricated
Electropolished (EP) Electropolished for Ultra High Purity Systems
Non-Electropolished (BA) Bright Annealed or (AP) Annealed & Pickled for High-Purity, (CFOS) Cleaned for Oxygen Grade Service or Corrosive Systems
I.D. Surface Finish Options 5, 7 & 10 µin. Ra
JIS 8A to 250A
Tolerances In accordance with: ASTM: A269 & A632, JIS: G 3459
Super Duplex tubing End Plain End, Beveled End, Treaded, Ends are suitable for orbital welding
Marking All Super Duplex tubes are marked as follows: Standard, Grade, OD, Thickness, Length, Heat No. (Or according to the customer’s request.)
Super Duplex tubing Application Oil Tube, Gas Tube, Fluid Tube, Boiler and Heatexchanger
Value Added Service Draw & Expansion as per required Size & Length, Polish (Electro & Commercial) Annealed & Pickled Bending, Machining Etc.
Specialize in Duplex Capillary Tube & Other Odd Size
Duplex Heat Exchanger & Condenser Tubes
Duplex Hydraulic tubing with OD up to 50.8 mm (2.0 in.) are delivered in bright annealed condition
Duplex hydraulic tube with OD larger than 50.8 mm are supplied in the annealed and pickled condition, Or in polished condition
Marking & Traceability Each Duplex Tubing is traceable to its producing mill and heat by an identification number etched within 24" (610mm) of one end.
Super Duplex tubing Test Certificate Manufacturer Test Certificate according to EN 10204 3.1 B
Laboratory Test Certificate from Govt. Approved Lab. 
Under Third Party Inspection
Super Duplex tubing Testing & Inspection Visual inspection • Surface roughness measurement • Helium-leak testing • Scanning Electron Microscopy (SEM) • Auger Electron Microscopy (AES) • Election Spectroscopy for Chemical Analysis (ESCA or XPS) • Particle testing • Moisture testing
We can also cut, thread, and groove Duplex Tubes to meet your specifications

Duplex Tube Wall Thickness

028 = .028" Thick
035 = .035" Thick
039 = .039" Thick
049 = .049" Thick
065 = .065" Thick
083 = .083" Thick
109 = .109" Thick

Super Duplex Tubing Tolerances

The Duplex tubes outer diameter (OD) are according to ASTM A269/A213. Duplex Tubing Tolerance specifications are as per below:

Duplex Tube OD Duplex Tube Tolerance
4mm to 35mm +/- 0.08mm
35mm to 38mm +/- 0.15mm
38mm to 60mm +/- 0.20mm
60mm and above +/- 0.25mm

Exporter of Duplex High Pressure Tube, Duplex Instrument Tube, Duplex Large Tube wholesaler in India, Duplex Metric Tube Manufacturer in India, Duplex Micro Tube, Duplex Hollow Tube Supplier, Duplex Steel Seamless Tubes Manufacturer in India

Types of Duplex Tube

Duplex Coiled Tubing
Duplex Coiled Tubing
Duplex Capillary Tube
Duplex Capillary Tube
Duplex U Shaped tubing
Duplex ‘U’ Shaped tubing
Duplex Gas Tube Ar 15 supplier
Duplex Gas Tube Ar 15 supplier
Duplex seamless tubing
Duplex seamless tubing
Duplex Thin Wall tube
Duplex Thin Wall tube
Duplex Furnace Tube
Duplex Furnace Tube
Duplex Gas Tube
Duplex Gas Tube
Duplex Heat Exchanger Tubes
Duplex Heat Exchanger Tubes
Duplex boiler tube
Duplex boiler tube
Duplex welded tubing
Duplex welded tubing
Duplex Square Tubing
Duplex Square Tubing
Duplex Steel Square Tube (Radius Corners)
Duplex Steel Square Tube (Radius Corners)
Duplex Rectangle Tube
Duplex Rectangle Tube
Duplex tubing
Duplex tubing

Types of Duplex Seamless & Welded Tubes

Duplex Annealed Tubing Super Duplex Coil Tubing Heat Exchanger
Super Duplex Thin Wall Tubing Super Duplex Metric Tubing
Super Duplex Seamless Square Tubing Large Diameter Super Duplex Tube
Super Duplex Woven Mesh Tube Super Duplex Instrumentation Tubing
Duplex Steel Seamless Tubes Duplex Stainless Steel Round Tube stockist
Duplex Steel Welded Tubes manufacturer Duplex Steel Seamless Tubing
Duplex Steel Coiled Tubing supplier Super Duplex Capillary Tubing
Super Duplex Aerospace tubes Duplex High Pressure Tube
Super Duplex Sighting Tube Duplex Polish Tubes manufacturer
Duplex Elliptical and Oval Tubes Duplex Rectangular Tube
Duplex Condenser Tube Duplex Aero engine tubes
Duplex Steel straight tube boiler supplier Duplex furnace tube manufacturer
Duplex Mirror Tube Duplex Steel Rectangular Tube supplier
Duplex Stainless Steel Pitot Tube stockist Super Duplex Round Tube
Duplex Polished Tubing Duplex Steel Ornamental Tube manufacturer
Duplex Stainless Steel Perforated Tube WERKSTOFF NR. Flexible Tube
Duplex Finned Tube stockist Duplex Steel Dom Tube supplier
ASTM A789 Duplex Stainless Steel Perforated Exhaust Tube WERKSTOFF NR. Rhs Tube
Duplex Steel Corrugated Tube Duplex Steel Honed Tube
Duplex Slotted Handrail Tube Duplex Steel Thin Wall Tube supplier
ASTM A789 Duplex Stainless Steel Thick Wall Tube Super Duplex Threaded Tube stockist
ASTM A789 Duplex Stainless Steel U Shaped Tube Super Duplex Square Tube Mirror Finish
Duplex Steel Vacuum Tube supplier WERKSTOFF NR. Coaxial Tube
Ultra-High Purity Electropolished Duplex Tube Thin Wall Duplex Tube stockist
Super Duplex Instrument Tubing Super Duplex Square Tubing
Duplex Coil Tubing Duplex Boiler Tube

Duplex Tube Properties

Super Duplex mechanical properties & chemical composition

Typical compositions and proof strengths of common duplex stainless steels

Typical Chemical Composition % 0.2%
%C Cr Ni Mo N Cu
2304 S32304 1.4362 duplex 0.015 23.0 4.0 0.055 0.13 400
2205 S31803 1.4462 duplex 0.015 22.0 5.5 3.0 0.14 - 450
2205 S32205 1.4462 duplex 0.015 22.5 5.5 3.3 0.17 450
255(UR52N) S32520 1.4507 super duplex 0.015 25.0 7.0 3-5 0.28 0.13 550
2507 S32750 1.4410 super duplex 0.015 25.0 7.0 4.5 0.28 0.3 550
Zeron 100 S32760 1.4501 super duplex 0.015 25.0 7.0 3.5 0.25 0.8 550
Sandvik SAF3207 S33207 - hyper duplex 0.03 31 7.5 4.0 0.50 0.75 700

We have our stockholders & dealers in India who maintain stock of high pressure Duplex tubing, Super Duplex Seamless Tubes, Super Duplex Round Tubes, Duplex Heat Exchanger Tube and other types of Duplex Steel Polish Tubing in regular sizes. Our Distributor in India are in following locations: Mumbai, Delhi, Bangalore, Hyderabad, Surat, Pune, Nagpur, Indore, Ahmedabad, Chennai, Kolkata, Thane, Vadodara, Nashik, Bhopal, Visakhapatnam, Faridabad, Rajkot, Aurangabad, Ranchi, Coimbatore, Raipur, Mysore, Kochi (Cochin), Bhavnagar, Tirupur, Bhubaneswar, Salem, Bhilai, Bhiwandi, Bikaner, Mangalore, Ankleshwar, Assam and Siliguri. You can contact them directly for best price & exact delivery time for required size of Duplex Steel seamless tubing near you.

Duplex seamless tube stock is available most common sizes in our India, UAE, USA & UK inventory. These Duplex Steel tubing is supplied bright annealed in the outside diameter range 6 –42 mm (0.25 in –1.625 in) and wall thickness 0.89 –5.00 mm (0.035 in –0.197 in). We at Steel Tubes India also stock Duplex High-Pressure Tube in straight lengths and coils. Duplex coiled and straight length tubing are supplied annealed and solution annealed condition. Duplex Instrumentation Tubes stock is available for most common sizes.

Types Out diameter Sizes Length
NB Sizes (in stock) .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
Duplex Seamless Tube (Custom Sizes) 6.35 mm OD To 101.6 mm OD  As per requirement Cut to length
Duplex Welded Tube (ERW Tube) (in Stock + Custom Sizes) 6.35 mm OD To 152 mm OD As per requirement Cut to length

Duplex Seamles Tubes Surface Finish

Surface Finish Internal Surface(ID) Exterbal Surface(OD)
Roughness Average(RA) Roughness Average(RA)
μ inch μm μ inch μm
AP Annealed & Pickled Not defined Not defined 40 or Not defined 1.0 or Not defined
BA Beight Annealed 40,32,25,20 1.0,0.8,0.6,0.5 32 0.8
MP Mechanical Polish 40,32,25,20 1.0,0.8,0.6,0.5 32 0.8
EP Electro Polish 15,10,7,5 0.38,0.25,0.20;0.13 32 0.8

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Client Reference and Applications

Our Duplex Tube are suitable for Aerospace, Plant manufacturing, Machine engineering, Power generation and Nuclear Power Plant etc. We are supplying high quality Duplex Tube to our clients globally.

Aircraft Materials & Aerospace Materials Specialist

Duplex Tube stockist | Duplex Tube suppliers | Duplex Tube manufacturer in India | Duplex Tube Stock