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Since 2006

Duplex Stainless Steel stockist in India

At Naman Pipe & Tubes, we focus on delivering high-quality Duplex & Super duplex products. We are one of the largest Duplex Steel stockists in Mumbai. We maintain a large inventory of products to ensure competitive lead times. We aim to deliver the products to your job site quickly. With many years of experience to back us, we can dispatch the goods in a short duration. The warehouse location is advantageous, making it possible to dispatch the goods in 48 hours - anywhere in India.

We offer test reports (EN 10204 3.1 and 3.2) for the goods we supply during delivery. To receive a 3.2 certification, a third-party inspector visits the client facility. He will test the sample to check conformance to dimensions, sample dimensional checks, chemical analysis, validate their properties meet the requirements & visual examination. The parameters to receive a test certificate 3.1 are welding condition, impact and tension tests.

Supplying not only the DSS products but complete solutions for marine applications and desalination plants, know more about PWHT requirements

Duplex alloys are dual-phased metals. Essentially, two phases co-exist in the microstructure of DSS Long Products - Ferrite & Austenite. Both phases give the products different sets of characteristics. It inherits the corrosion resistance properties from the austenite phase. The strength and toughness is a derivative of Ferrite. The co-existence of such a microstructure lends superior characteristics to regular steel alloys. Duplex alloys will rarely receive a post-weld heat treatment. Sigma phase formation results in their inability to accept treatment at the normal range. To receive a post-weld heat treatment, it must undergo solution annealing with water quenching.

Duplex Products
Duplex material

Grades and

American Standards

Stockist of Norsok M630 MDS D45 approved Duplex Steel material, refer DSS uses & applications

The ferrite range in the Duplex Steel Material ranges between 35% to 60%. Ideally, the alloy's microstructure must be at 50% ferrite and 50% austenite. An almost equal ratio brings out its exceptional mechanical and physical properties. In the duplex variety, the ferrite phase in its microstructure is responsible for its high tensile strength. Ferrite gives it high resistance to chloride stress-related corrosion cracking. The alloy's chemistry has to be kept in check while choosing this type of steel. If the ferrite phase is low, the resistance to SCC dives. And it affects the toughness if it is high. Applications of the SDSS Flat Products include desalination plants, petrochemical industries, flue gas desulfurization and marine engineering projects.

Suitable for up to 316°C temperature and Up to 1000MPa Tensile strength

Excellent mechanical properties For Seawater Application

Wide stock of Duplex steel & SDSS material, know more about Galvanic Corrosion Behavior

The cause of galvanic corrosion is two chemically dissimilar metals in electrical contact. When an electrolyte like moisture or salt water is present, the rate of corrosion increases. Stainless steel alloys are at short distances in a galvanic series chart. When two chemically similar components are nearby, the chances of galvanic corrosion are low. The joining of a steel and stainless steel alloy water gets corroded. Coating the Duplex Stainless Steel reduces the risk of galvanic corrosion. Galvanizing, painting or polishing the metal surfaces will hinder the interaction of the dissimilar metals. A surface treatment acts as a barrier to moisture and minimizes galvanic corrosion.

Grades Solution Annealing Temperature Limit Pipes & Tubes Plate/ Strips/ Coils
(EN 10088-2)
Forged Fittings & Flanges Buttweld Fittings Bars
(EN 10088-3)
  • 2507
  • UNS S32750
  • EN 1.4410
1050 - 1125°C
  • 280°C (VdTÜV)
  • 316°C (ASME BPVC)
  • ASTM A789
  • ASTM A790
  • ASTM A240
  • ASTM A182
  • ASTM A815
  • ASTM A479
  • 2205
  • UNS S31803
  • UNS S32205
  • EN 1.4462
1020 - 1100°C
  • 250°C (VdTÜV)
  • 316°C (ASME BPVC)
  • ASTM A789
  • ASTM A790
  • NFA 49-217
  • ASTM A240
  • ASTM A182
  • ASTM A815
  • ASTM A276
View duplex steel grades, hardness, hydrogen embrittlement & heat treatment, find Duplex Steel Price Per Kg in Mumbai

Duplex steels are tough inherently, thanks to their ferrite phase. It is possible to use the alloy in high-temperature applications. Yet, there are limitations in the temperature range. Using it at a temperature greater than 300°C causes it to become brittle. During its embrittlement, the metal loses its plasticity due to the separation of the ferrite phase. It occurs due to the precipitation hardening of hydrogen. In applications involving hydrogen sulfide, the splitting of the molecule causes the hydrogen atoms to deposit on the walls of the material. After some time, the material becomes weak and is prone to cracking.

Duplex Steel Products undergo heat treatment by solution annealing and water quenching. During solution annealing at high temperatures, the alloy becomes uniform as it dissolves and distributes itself evenly. Rapid cooling with water causes the composition to freeze.

Description Price Per Kg In US $ Price Per Kg In EURO Price Per Kg In Malaysia Currency Price Per Kg In Singapore Dollar
Duplex 2205 Pipe (Seamless) US $ 5.82 5.51 25.49 8.08
Welded US $ 3.88 3.67 17.00 5.39
Duplex 2205 Round Bar US $ 3.23 3.06 14.16 4.49
F51 Round Bar US $ 3.36 3.18 14.73 4.67
Super Duplex 2507 Round Bar US $ 4.52 4.28 19.83 6.28
Zeron 100 Round Bar US $ 4.85 4.59 21.24 6.73
Duplex 2205 Plate US $ 4.52 4.28 19.83 6.28
Super Duplex 2507 Plate US $ 7.11 6.73 31.16 9.88

Find complete information about Duplex Steel including Chemical Composition, Equivalent, Mechanical Properties, and Price List.

Know about Duplex Steel chloride limit & resistance at elevated temperatures, view Pren number of DSS

Duplex grades can withstand high chlorine levels without the risk of getting corrosion. During Flue gas Desulphurization, alloys face exposure to chlorine. The chlorine level in the slurry reaches 35,000 ppm. Chlorides rapidly decay most alloys, except those whose Pren value is higher than 32. Alloys with PREN higher than 32 show resilience to corrosion in chloride environments. Duplex and Super duplex stainless steel can function well even in high-chlorine environments. The PREN value for a duplex alloy is 35. Chlorine bleach is synonymous with the pulp and paper industry. The chemical composition of bleach includes chlorine, which is highly corrosive. The preference for this material goes beyond its corrosion resistance. At warmer temperatures, the alloy shows no adverse reaction.

Name of the Alloy Pitting Resistance Equivalence Number (PREN) European Grade
SAF 2205 30.8-38.1 BS EN 1.4462
SAF 2507 less than 40 BS EN 1.44102
2202 26.5 BS EN 1.40621
LDX 2101 24.5-28.6 BS EN1.4162
Ferrinox 255 less than 40 BS EN 1.45072
SAF 2304 23.1-29.2 BS EN1.4362
Zeron 100 less than 40 BS EN1.45012