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Duplex UNS S31803 Seamless Pipe

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Duplex S31803 Seamless Pipe, DIN 1.4462 Seamless Tube, ASME SA790 Duplex S31803 Polished Pipe, UNS S31803 Seamless Mirror Finish Pipe, ASTM A790 Duplex S31803 Boiler Pipe.

Based on the amount of alloy present, the corrosion performance of the series of duplex stainless steels varies. Due to their composite microstructure, which contains about equal proportions of ferrite and austenite, they are referred to as duplex pipes. Duplex pipe steel was restricted to a few particular applications in the first-generation grades: chromium, nickel, and molybdenum alloys. Despite having outstanding performance qualities, the welds had low toughness due to an excess of ferrite. Over regular conventionally treated steel, Duplex S31803 Seamless Pipe Suppliers is twice as strong, twice as high-quality, and has a better execution record. Duplex S31803 Seamless Pipe frequently finds use in marine, aerospace, chemical processing, nuclear plants, pollution control equipment, and other areas.  

Properties of Duplex steel UNS S31803 seamless pipes:

  • The PREN value, of these pipes is higher than that of stainless-steel alloys 304 and 316.
  • Standard steel pipes both have a propensity to break when sulphide or chloride ions are accumulated on their surfaces because they have comparatively low protection to such corrosive ions.
  • These Pipes provides exceptional impact toughness even at low temperatures. Given that the alloy’s yield strength is two times greater than that of any grade, these pipes may be thinner. This decreases the cost in addition to making the pipe more lightweight.

About Duplex UNS S31803 Seamless Pipe

  • The chemical properties based on large levels of Cr and Mo, respectively, improves the resistance to oxidation and pitting corrosion. Nitrogen additions can speed up the structural hardening process via a substitutional solid solution mechanism, raising mechanical properties and tensile strength values without lowering toughness.
  • Furthermore, compared to conventional stainless steels, the two-phase microstructure guarantees superior protection against pitting.
  • Duplex steel UNS S31803 seamless pipes provide several beneficial characteristics. A product of astounding quality has been produced in the business by considering diverse raw material standard characteristics, employing high-quality alloy, and implementing control procedures.  
  • These Duplex Seamless Pipe exhibit resistance to both stress-corrosion cracking and common corrosion. These Pipes are also utilised in brewing, hot water, desalination, and processing industries. These seamless pipes are more durable and better equipped to handle pressure since they are constructed of duplex steel S31803. Pressure vessels, storage tanks, and structural uses are further used.


  • High power
  • High resistance to pitting and resistance to crevice corrosion
  • high resistance to erosion, corrosion fatigue, and stress corrosion cracking
  • Excellent resistance to sulfide stress corrosion
  • Compared to austenitic steels, less thermal expansion and enhanced heat conductivity
  • excellent weldability and workability.
  • High absorption of energy.
  • Dimensional precision
  • excellent finish robust

Specification Of Duplex UNS S31803 Seamless Pipe

Duplex Seamless Pipes SpecificationsASTM A790 / ASME SA790
Dimensional specificationANSI/ASME B36.19M, ANSI/ASME B36.10M
Duplex Seamless Pipe Size1 / 8" NB - 24" NB
Duplex Welded Pipe Size1 / 8" NB - 24" NB
Duplex EFW Pipe Size6" NB - 48" NB
Outside Diameter6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB available Ex-stock, OD Size Steel Tubes available Ex-stock
Duplex Pipes Manufacturing ShapesHydraulic, Round, Rectangle, Square, Hex, Honed
Delivery ConditionAnnealed and Pickled, Polished, Coiled, Cold Drawn
Heat TreatmentNormalized, Normalized & Tempered
Manufacturing TechniquesNormalized & as Rolled
Duplex Steel Pipe Schedule Thickness RangeSCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
Duplex Pipes End TypesPlain End, Beveled End, Treaded One End, TBE (Treaded Both Ends)
Surface FinishNo.1, No.4, No.8 Mirror Finish, 2B
Value Added ServicesCutting, Beveling, Polishing, Threading, Destructive, Non Destructive, Ultrasonic Testing
Inspection and Test ReportsEN 10204 3.1, Mill Test Certificates, Chemical Reports, PMI Test Reports, Mechanical Reports, Third Party Inspection, NABL Approved Lab, Visual Inspection, Destructive Test and Non Destructive Test Reports
Outside Finish2B, No.4, No.1, No.8 Mirror Finish for Duplex Steel Pipes, Finish as per customer Requirements
Packing of Duplex PipesPacked in Wooden Boxes, Plastic Bags, Steel Strips Bundled, or as per Customers Requests
SpecialsSizes and Specifications other than above can be on request

Equivalent Grades Duplex UNS S31803 Seamless Pipe

Duplex S318031.4462S31803

Chemical Composition Duplex UNS S31803 Seamless Pipe

S318030.030 max2.00 max1.00 max0.030 max0.020 max22.0 – 23.03.0 – 3.54.50 – 6.500.14 – 0.2063.72 min

Mechanical Properties Duplex UNS S31803 Seamless Pipe

GradesDensity (g/cm 3)Density (lb/in 3)Melting Point (°C)Melting Point (°F)
S318037.8050.2851420 – 14652588 – 2669

Dimensions Of Duplex UNS S31803 Seamless Pipe

cupro Nickel Seamless Pipe Dimensions Chart :

Nominal Pipe SizeOutside Diameter (mm)Nominal Wall Thickness Schedule
1/8610.3 1.24   1.731.731.73 2.412.412.41     
1/4813.7 1.65     
3/81017.1 1.65   2.312,312.31     
1/21521.31.652.11   2.772.772.77 3.733.733.73   4.787.47
3/42026.71.652.11   2.872.872.87 3.913.913.91   5.567.82
12533.41.652.77   3.383.383.38 4.554.554.55   6.359.09
1 1/43242.21.652.77   3.563.563,56 4.854.854.85   6.359.70
1 1/24048.31.652.77   3.683.683.68   7.1410.15
25060.31.652.77   3.913.913.91 5.545.545.54   8.7411.07
2 1/265732.113.05   9.5314.02
38088.92.113.05   5.495.495.49 7.627.627.62   11.1315.24
3 1/290101.62.113.05   5.745.745.74     
4100114.32.113.05 8.568.568.56 11.13 13.4917.12
5125141.32.773.40   6.556.556.55 9.539,539.53 12.70 15.8819.05
6150168.32.773.40 10.9710.9710.97 14.27 18.2621.95
8200219.12.773.76 6.357.
10250273.13.404.19 6.357.809.279.279.2712.7012.7012.7015.0918.2621.4425.4028.5825.40
12300323.93.964.57 6.358.389.539.5310.3114.2712.7012.7017.4821.4425.4028.5833.3225.40
14350355.63.964.786.357.929.53 9.5311.1315.09 12.7019.0523.8327.7931.7535.71 
16400406.44.194.786.357.929.53 9.5312.70i6.66 12.7021.4426.1930.9636.5340.49 
18450457.24.194.786.357.9211.13 9.5314.2719.05 12.7023.8329.3634.9339,6745.24 
205005084.785.546.359.5312.70 9.5315.0920.62 12.7026.1932.5438.1044.4550.01 
22 5594.785.546.359.5312.70 9.53 22.23 12.7028.5834.9341.2847.6353.98 
246006105.546.356.359.5314.27 9.5317.4824.61 12.7030.9638.8946.0252.3759.54 
26 660  7.9212.70  9.53   12.70      
28700711  7.9212.7015.88 9.53   12.70      
30 7626.357.927.9212.7015.88 9.53   12.70      
32800813  7.9212.7015.88 9.5317.48  12.70      
34 884  7.9212.7015.88 9.5317.48  12.70      
36900914  7.9212.7015.88 9.5319.05  12.70      
38 965      9.53   12.70      
4010001016     9.53 12.70         
42 1067   12.7015.88 9.5319.05  12.70      
4411001118      9.53   12.70      
46 1168      9.53   12.70      
4812001219      9.53  12.70       
52 1321                 

Different Types Of Duplex UNS S31803 Seamless Pipe

Different Types Of seamless Pipe

Application of Duplex UNS S31803 Seamless Pipe

Testing of Duplex UNS S31803 Seamless Pipe

Packing of Duplex UNS S31803 Seamless Pipe

Destination Of Duplex UNS S31803 Seamless Pipe

UNS S31803 Seamless Mirror Finish Pipe Stockist in Pimpri-Chinchwad, DIN 1.4462 Seamless tube Supplier in Coimbatore, ASTM A790 Duplex S31803 Boiler Pipe Exporter in Hyderabad, ASME SA790 Duplex S31803 Polished pipe Manufacturer in Mumbai, DIN 1.4462 Seamless Pipes Manufacturer in Hyderabad, Duplex S31803 Seamless Pipe Manufacturer in Bengaluru, A790 ASTM Duplex S31803 Boiler Tubes Stockist in Bangalore, Duplex S31803 Seamless Tube Supplier in Chennai, SA790 ASME Duplex S31803 Polished Tubes Supplier in Vadodara, UNS S31803 Seamless Mirror Finish Tubes Exporter in Pune.
SA790 ASME Duplex S31803 Polished Tubes Supplier in Vietnam, DIN 1.4462 Seamless tube Supplier in Saudi Arabia, DIN 1.4462 Seamless Pipes Manufacturer in Indonesia, UNS S31803 Seamless Mirror Finish Tubes Exporter in Qatar, Duplex S31803 Seamless Pipe Manufacturer in USA, ASME SA790 Duplex S31803 Polished pipe Manufacturer in Singapore, UNS S31803 Seamless Mirror Finish Pipe Stockist in UK, ASTM A790 Duplex S31803 Boiler Pipe Exporter in Kuwait, A790 ASTM Duplex S31803 Boiler Tubes Stockist in South Africa, Duplex S31803 Seamless Tube Supplier in UAE.
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