Duplex pipe

Duplex Pipe

The duplex alloy of iron, nickel, and chromium composition has a two-phase microstructure at room temperature. Made of ferritic-austenitic stainless steel duplex pipes are useful for many applications worldwide. Using these duplex steel pipes has many advantages of high strength, excellent corrosion resistance, ductility, weldability, etc.

The duplex pipe has high chromium and nickel and both austenitic and ferritic characteristics. Duplex stainless steel pipe is made of alloys with varying compositions of 18 to 28% chromium, 3 to 10% nickel in low C conditions, and other elements like copper, titanium, nitrogen, etc.

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Find the cheapest duplex seamless pipe suppliers in UAE and view duplex piping specifications

Duplex pipe specification


Duplex Pipe Specification

Duplex SS pipe dimensions DSS pipe Wall thickness Duplex steel pipe Length
  • DSS seamless pipe size: 4 to 219 mm
  • duplex stainless welded pipe size: 5 to 1219.2 mm
  • 0.5 – 20mm
  • Thinner wall thickness

Duplex SS pipe wall thickness can be reduced by up to 50%, contact above duplex pipe suppliers for more details

 

  • 5.8 meters (20 feet)
  • 17-24 feet
  • 6 meters (21 feet)
  • DSS pipe maximum length : 25000mm
  • Customized/ cut to size

Contact above stockholders, distributors and stockists for Ex-stock, these duplex pipe suppliers also offer cut to size material and supply in Saudi Arabia, UAE, Qatar & Oman

Required list of DSS seamless pipe mechanical test American standard for OD and thickness Duplex stainless pipe manufacturing process
  • Tension test
  • Flange test (for duplex welded pipe)
  • Flaring test (for DSS seamless pipe)
  • 100% PMI tested
  • Hardness test
  • Reverse flattening test
  • Duplex stainless steel hot finished seamless pipe
  • Duplex stainless cold finished seamless pipe
  • DSS cold drawn pipe
  • Duplex SS cold rolled pipe
  • Duplex alloy precision cold rolled pipe
European standard Duplex stainless steel seamless pipe pipe end Duplex steel square pipe manufacturing type
  • EN 10216-5 (seamless & welded pipe)
  • EN 10296-2 (welded pipe)
  • EN 10297-2 (seamless pipe)
  • EN 10312 (welded pipe)
  • EN 10217-7 (welded pipe)
  • PE (Plain End)
  • BE (Beveled Ends)
  • DSS seamless pipe
  • Duplex SS ERW pipe
  • Stainless steel duplex welded pipe
  • Duplex steel EFW pipe
Duplex pipe schedule chart Meet standards Seamless duplex stainless steel pipe surface finish and treatments
  • 4 Inch
  • Schedule 5 / 5S
  • SCH 10 duplex stainless steel pipe (Most selling)
  • SCH 20
  • SCH 30
  • SCH 40 duplex SS pipe
  • SCH 40S (Most selling)
  • SCH 80
  • SCH 80S
  • SCH 120
  • SCH 160
  • Standard (SCH STD)
  • Ex-Standard (XS)
  • Double Extra Strong (XSS)
  • ASME B36.19M
  • ASME B36.19
  • EN 10088-2
  • EN 10217-7 (welded pipe)
  • NSF 61
  • EN 10088-3
  • EN 10216 – 2
  • EN 10216 – 5
  • DIN 17458
  • DIN 17456
  • Passivated
  • Cleaned
  • Pickled
  • Precleaned
Duplex steel round pipe finish QC and duplex SS pipe supporting documents List of leading Duplex Pipe manufacturers
  • Bright Annealed
  • Annealed & Pickled (A&P)
  • 2B
  • Solution annealed duplex steel round pipe
  • BA polishing
  • No.4
  • Mirror
  • 320 grit
  • 180 grit polished
  • Matt finish
  • 400 grit
  • Cold Drawn
  • 600 grit

Refer these details before buying DSS pipe from manufacturers, suppliers, traders, stockholders, stockist, or importers

  • MTC EN 10204 type 3.1
  • duplex pipe material, schedule & size as per the work order
  • Verify quantity
  • Check duplex steel pipe dimensions
  • QC/ Inspection reports
  • Duplex welded pipe detailed inspection plan (appearance, integrity, packaging etc)
  • Labeling verification
  • Origin of material

Buy these make ex-stock from verified Duplex Pipe suppliers in UAE at dealer price

  • ArcelorMittal, Luxembourg (Europe)
  • Outokumpu, Finland (Europe)
  • Aperam, Luxembourg (Europe)
  • Acerinox, Spain
  • Jindal steel pipe, India
  • Nippon Steel Corporation, Japan
  • ThyssenKrupp AG, Germany
  • POSCO, South Korea
  • MACSTEEL, Gauteng (South Africa)
  • Baosteel, China
  • Sandvik, Sweden
  • Tata Steel, India
  • Tubecon, Pretoria (South Africa)
  • Tenaris, Luxembourg (Europe)
  • SMM Oman
  • Jiangsu Shagang, China
  • Nippon Steel & Sumitomo Metal Corporation, Japan
  • JFE, Japan
  • AL JAZEERA, Oman
  • Bristol Metals, USA
  • Nippon Yakin Kogyo Co., Ltd., Japan
  • Steelmor, Gauteng (South Africa)
  • Sosta, Italy
Duplex stainless pipe value added services Duplex pipe material tolerance  acc. ASTM-A999 Duplex steel pipe standard
  • Cutting
  • Threading
  • Beveling
  • Ultrasonic Testing
  • Polishing
  • Destructive & Non Destructive
  • ±1%
  • ASTM
  • DIN
  • GOST
  • JIS
  • EN
Duplex alloy round beveling Duplex welded pipe pressure rating Chloride corrosion in duplex seamless pipe
  • Abrasive Saw Cutting
  • Hi-Def Plasma Cutting
  • Bar Cutting
  • Laser Cutting
  • Chop Stroke
  • Laser/Punch Combo
  • Coil Leveling
  • Pipe Threading
  • Gauer/Straightener
  • Plate Beveling
  • Pipe Beveling
  • Rod Coil Line
  • Virtek LaserQC
  • Shear Cutting
  • Timesavers
  • Waterjet Cutting
  • Class 100
  • Class 200
  • Class 300
  • Class 400
  • Class 500
  • Class 600
  • PREn : 35
  • CPT ºC (ºF) : 35 (95)
Duplex pipe suitable applications & chemicals
  • High pressure
  • Low-pressure
  • low temperature
  • H2S
  • NH3
  • HCl

Select the Middle East stockists selling the most affordable duplex stainless steel seamless pipe; learn about duplex pipe welding

Types of duplex steel pipe

Seamless duplex pipe

Seamless duplex pipe

Welded duplex pipe

Welded duplex pipe

Thick wall duplex steel pipe

Thick wall duplex steel pipe

Schedule 40 duplex pipe

Schedule 40 duplex pipe

Duplex oval pipe

Duplex steel oval pipe

DSS square pipe

DSS square pipe

Duplex round pipe

Duplex round pipe

DSS ERW pipe

DSS ERW pipe

Polished duplex steel pipe

Polished duplex steel pipe

Beveled edge duplex pipe

Beveled edge duplex pipe

DSS clad pipe

DSS clad pipe

Duplex steel EFW pipe

Duplex steel EFW pipe

Duplex pipe wall thickness chart

DSS pipe wall thickness as per ASME B 36.19

SCH
10S
SCH
40S
DN Ø SCH
80S
SCH
160
2,11 2,77 1/2″ 21,34 3,73 4,78
2,11 2,87 3/4″ 26,67 3,91 5,56
2,77 3,38 1″ 33,40 4,55 6,35
2,77 3,56 1 1/4″ 42,16 4,85 6,35
2,77 3,68 1 1/2″ 48,26 5,08 7,14
2,77 3,91 2″ 60,32 5,54 8,74
3,05 5,16 2 1/2″ 73,03 7,01 9,52
3,05 5,49 3″ 88,90 7,62 11,13
3,05 5,74 3 1/2″ 101,60 8,08
3,05 6,02 4″ 114,30 8,56 13,49
3,40 6,55 5″ 141,30 9,53 15,88
SCH
10S
SCH
40S
DN Ø SCH
80S
SCH
160
3,40 7,11 6″ 168,29 10,97 18,26
3,76 8,18 8″ 219,08 12,70 22,23
4,19 9,27 10″ 273,08 12,70 28,58
4,57 9,53 12″ 323,85 12,70 33,32
4,78 14″ 355,60
4,78 16″ 406,40
4,78 18″ 457,20
5,54 20″ 508,00
6,35 24″ 609,60
SCH
10S
SCH
40S
DN Ø SCH
80S
SCH
160
  • DN = DSS Pipe size
  • Ø = Nominal outer diameter
  • DSS pipe Schedule = ANSI B36.10 / ASME B36.19 Nominal wall thickness in mm

Tolerances of duplex steel pipes

Outer diameter
(OD)
Wall thickness
%
Permissible deviations
in mm
1/8″ < 2″ -12,5 +0,4 / -0,8
> 1 1/2″ < 5″ -12,5 +0,8 / -0,8
> 4″ < 10″ -12,5 +1,6 / -0,8
> 8″ < 20″ -12,5 +2,4 / -0,8
> 18″ < 28″ -12,5 +3,2 / -0,8
> 26″ < 32″ -12,5 +4,0 / -0,8

Duplex stainless steel pipe grades

Compare duplex stainless steel pipe performance in different environment

ENVIRONMENT Not Suggested Good Better Best
CHLORIDE STRESS CORROSION CRACKING
HYDROFLUORIC ACID
  • Gold
  • Platinum
CHLORIDES (pitting, crevice corrosion)
NITRIC ACID
  • Zirconium
  • Tantalum
HYDROCHLORIC ACID
PHOSPHORIC ACID (commercial)
SULPHURIC ACID
  • RA20
  • Tantalum
CAUSTIC

Equivalent standard of Duplex stainless steel pipe

Abstract of duplex steel pipe

  • Familiy: stainless steels
  • Other trade name: austenitic-ferritic
  • Metallurgical structure : austenite, and ferrite
Material Grade EN/ DIN/ Wnr UNS Flanges Fasteners Welding Electrode
Duplex pipe
  • 1.4462
  • UNS S31803
  • UNS S32205
Super duplex pipe
  • 1.4410
  • S32950
  • S32750

Chemical composition of duplex pipe material

GRADE S Chromium Nickel P Molybdenum Manganese C Nitrogen Si
UNS S32205 minimum 22 4.5 3 .14
maximum .02 23 6.5 .03 3.5 2 .03 .2 1
UNS S31803 minimum 21 4.5 2.5 .08
maximum .02 23 6.5 .03 3.5 2 .03 .2 1

Stainless steel duplex pipe mechanical properties

Material Density Tensile Strength MP Yield Strength (0.2%Offset) Elongation
Duplx pipe 7.8 g/cm3
  • Psi – 116000
  • MPa – 800
  • 1350 °C
  • 2460 °F
  • Psi – 80000
  • MPa – 550
  • 15 %

Duplex Pipe Properties

Electrodes of duplex pipe welding

  • E 2209-16
  • E 2205-16
  • E122 2209 Straight Duplex Welding Rods

DSS pipe weight chart

NPS inch inch OD Sched Wall Thickness Weight Weight
milimeter inch milimeter inch Lb/feet kilogram/meter
1/2 21 .840 40 STD 2.769 .109 .851 1.268
3/4 27 1.050 40 STD 2.870 .113 1.131 1.684
1 33 1.315 40 STD 3.378 .133 1.679 2.501
1 1/4 42 1.660 40 STD 3.556 .140 2.273 3.385
1 1/2 48 1.900 40 STD 3.683 .145 2.718 4.048
2 60 2.375 40 STD 3.912 .154 3.653 5.441
2 1/2 73 2.875 40 STD 5.516 .203 5.793 8.629
3 89 3.500 40 STD 5.486 .216 7.576 11.284
4 114 4.500 6.020 .237 1.790 16.073
6 168 6.625 4.775 .188 12.924 19.252
5.563 .219 14.983 22.318
40 STD 7.112 .280 18.974 58.263
9.525 .375 25.031 37.285
8 219 8.625 4.775 .188 16.940 25.233
5.563 .219 19.661 29.286
30 7.036 .277 24.696 36.786
9.525 .375 33.041 49.216
10 273 1.750 4.775 .188 21.207 31.588
20 6.350 .250 28.035 41.759
8.738 .344 38.231 56.946
11.125 .438 48.238 71.852
12 324 12.750 4.775 .188 25.222 37.570
6.350 .250 33.375 49.713
7.925 .312 41.445 61.735
1.312 .406 53.525 79.727
14 356 14 4.775 .188 27.732 41.308
20 6.350 .250 36.713 54.685
7.925 .312 45.611 67.939
40 11.125 .438 63.441 94.498
16 406 16 4.775 .188 21.748 47.290
10 6.350 .250 42.053 62.639
20 7.925 .312 52.275 77.866
11.125 .438 72.797 108.433
18 457 18 5.563 .219 41.588 61.948
7.137 .281 53.176 79.208
STD 9.525 .375 7.588 105.144
XHY 12.700 .500 93.450 139.198
20 508 20 6.350 .250 52.733 78.547
7.925 .312 65.604 97.719
11.125 .438 91.508 136.305
40 15.088 .594 123.110 183.378
24 610 24 6.350 .250 63.413 94.456
7.925 .312 18.932 117.573
11.125 .438 11.219 164.176
15.875 .625 156.028 232.410
30 762 30 6.350 .250 79.433 118.318
10 7.925 .312 98.925 147.353
11.125 .438 138.286 205.983
30 15.875 .625 196.078 292.066
36 914 36 6.350 .250 95.453 142.180
10 7.925 .312 118.918 177.133
11.125 .438 166.353 247.790
15.875 .625 236.128 351.723
19.050 .750 282.353 42.576
42 1067 42 7.925 .312 138.911 206.914
XHY 12.700 .500 221.610 33.097
48 1219 48 STD 9.525 .375 19.738 284.112
XHY 12.700 .500 253.650 377.822
22.225 .875 44.383 655.969

searching for importers of PMI-tested ANSI SCH 80, 40, or 60 duplex stainless steel pipe? look at the cost comparison.

The price of duplex stainless steel pipe and 316 steel pipe depends on how the alloy is resistant to corrosion. Though 316 has the best corrosion resistance in the 300 steel family, it is less the corrosion resistance of duplex steel pipes in applications with more chlorine. Also, the corrosive pitting of duplex pipe is far better than 316.

Hence the price of the duplex welded pipe is more than most of the 300 steel family pipes because of its better properties and use. The average cost of duplex pipe is from 400 to 500 rupees per kg, whereas that of 316 is less than it for most of its grades.

There are over 3500 grades to provide suitable steel per the application needs. The grading system enables the characterization of the steel types depending on the different uses, which make DSS pipe distinct from one another. ASTM uses the ‘A’ prefix with numbers assigned sequentially, and SAE grades steed with four-digit numbers. The first two numbers denote the steel type, and carbon concentration gets indicated by the last two digits.

Duplex pipes having the properties and microstructure of both ferrite and austenitic steels is not tricky to weld but different from other steels. Duplex steel welding characteristics are better than ferrite but not on par with austenitic steels. But with more nitrogen used in today’s duplex steels, it is easily weldable but follows specific procedures.

  • MMAW or manual metal arc welding is best for position and single shield welding with limited access using a short arc to give stability by reducing the nitrogen pick-up risk
  • GTAW or gas tungsten arc welding is best for pipe joints made of thin materials less than 4mm
  • There are other traditional and new methods like GMAW, SAW, FCAW, laser, laser hybrid, plasma and others to weld duplex pipes, etc.
In Dubai, there are a lot of manufacturer & traders of duplex pipe material who provide a cut-to-length service. Final preparation as per international standards; see ASTM specification

With many steel types and hundreds of grades, only the ASTM or American Society for Testing Material specifications helps to categorize duplex pipes. ASTM A789 and A790 are the standard specifications of ASTM for various wall thicknesses, corrosion resistance sizes, shapes, etc. of pipes made from Duplex stainless steel.

Many duplex steel piping systems have ASTM specifications to categorize their carbon content and others. The ASTM A450 and A450 M specifications are for general requirements of ferritic alloy, carbon, and austenitic steel pipes.

Before making a purchase, compare the prices of duplex steel pipes from two or more reliable GCC suppliers. Check the roughness of the duplex welded pipe

Duplex stainless steel seamless pipe surface roughness plays a pivotal part in long-term performance. It is a measure of the variance of duplex seamless pipe surface topology. The roughness of duplex steel pipe affects its aesthetics, wear resistance, crack irritation, fatigue life and others.

The outside roughness of seamless duplex pipe is RA 20 defect level max 50 μm and inside surface roughness to max 20 μm. Ra’s roughness specification measures the pipes surfaces’ mean height to its average absolute mediation to calculate the correct measurement for Ra.

Must visit for lowest price duplex seamless pipe