Super Duplex

Super Duplex

Super Duplex properties and price per kg

Super Duplex Stainless Steel grades at a glance with ASTM specification and equivalent chart

Super duplex stainless steel is a type of stainless steel belonging to a special family of steels called the duplex steel. Duplex is a material that is made out of a chromium, molybdenum and nickel alloy. This alloy has a dual nature that contains properties of the ferritic steel and the austenitic steel. This dual nature causes the steel to be stronger and at the same time be corrosion resistant. There are three major groups of duplex; namely, the standard duplex, the super duplex and the lean duplex. The Super duplex has the highest pitting corrosion resistance. The Super duplex stainless steel grades differ ranging from EN1.4410 to some hyper duplex grades that have PREN numbers above 45. The PREN number indicates the composition percentages and the pitting corrosion resistance. The Super duplex steel price varies from supplier to supplier. We offer a competitive pricelist for out duplex steel products. There are different super duplex applications that used different grades of the material. The addition of nitrogen in the super duplex grades makes the corrosion resistance even higher. Applications in the oil and gas industry, the chemical industry, the marine and sea water industry all use super duplex extensively. To form the necessary intermettalic phases, sometimes tungsten is also used. The higher quantities of these elements make the material harder for processing because of the reduced impact resistance. If handled improperly, the material may crack under stress. Regardless, the Super duplex material properties make the super duplex specifically applicable in different applications. The piping systems in desalination plants, fuel systems, chemical industries and food processing industries use the super duplex grades. There are sheets, plates, pipes, fittings and other accessories made out of this material. The Super duplex steel suppliers sell all the different products of super duplex according to the need of the customers.

Super Duplex Products

Super Duplex Price Per Kg

UNS 31803 DUPLEX PLATE INR 329/kg

Super Duplex equivalent

Grade UNS DIN SS EN W-Nr AFNOR
Duplex 2707 HD S32707 - - - - -
Duplex 2507 S32750 X 2 CrNiMoN 25 7 4 2328 1.4410 - -

Super Duplex Grades

2507 Super Duplex Alloy UNS S32760/ S32750/ S32550/ S39274
Super Duplex 4501 -
UR52N+ UNS S32550
Zeron 100 UNS S32760
Ferralium 255 UNS S32550

Super Duplex ASTM Grades

Grade Bar Plate, sheet and strip Seamless / welded tube and pipe Flanges Pipe Fittings Forgings
Duplex 2707 HD - - ASTM A789/ A790, SA790 - - -
Duplex 2507 ASTM A479, SA479
EN 10088-3
ASTM A240 SA240
EN 10088-2
ASTM A789; A790, SA790 ASTM A182, SA182 ASTM A182, SA182
ASTM A815/ SA815
ASTM A182/ SA182
Duplex 2304 EN 10088-3 ASTM A240, SA240
EN 10088-2
ASTM A789; A790, SA790
EN 10216-5
- - EN 10088-3*

Super Duplex specification

Grade UNS Duplex Industry Specifications
2507 Duplex Steel UNS S32750 ASTM A182 F53, A240/ SA240, A276 / SA276, A479, A789, A790, A815, A928, A988
SAE J405
UNS S32760 ASTM A182 F55, A240 / SA240, A276/ SA276, A314, A473, A479, A789, A790, A815, A928, A988
SAE J405
International identifiers SUS 329J3L, S31803, SS2377, ASTM A182 F51, STS329J3 LTP, AISI 318 LN, Z3CND22-05Az

Super Duplex Applications

  • Solar Power
  • Storage tanks
  • Building and construction
  • Water Desalination
  • LNG (Liquefied Natural Gas)
  • Biofuels plants
  • Water transmission pipes
  • Pressure vessels, reactor tanks and heat exchangers
  • Desalination and seawater systems
  • Rotors, impellers and shafts in industrial equipment
  • Pulp and paper plants
  • Phosphoric acid production system
  • Absorber towers, FGD systems for air pollution control
  • Food, oil and gas, mining and architectural applications

Super Duplex Composition

Cr Ni Mo N S Cu C Mn Si P Fe
24.0-26.0 6.0-8.0 3.0-5.0 .24-.32 0.020 Max 0.50 Max 0.030 Max 1.20 Max 0.80 Max 0.035 Max Balance

Super Duplex Steel properties

.2% Yield Strength, ksi Minimum Ultimate Tensile Strength, ksi Minimum % Elongation Min.
80 116 15 310

Super Duplex stainless steel temperature limits

UNS N° Grade EN N° Hot FormingTemperature Range Minimum Soaking Temperature
S32304 1.4362 1150-950 Deg C 980 Deg C
S32205 1.4462 1230 -950 Deg C 1040 Deg C
S32750 1.4410 1235-1025 Deg C 1050 Deg C
S32520 1.4507 1230-1000 Deg C 1080 Deg C
S32760 1.4501 1230-1000 Deg C 1100 Deg C

Benefits & features of Super Duplex Steel

  • High weldability
  • Very high resistance to pitting and crevice corrosion
  • High resistance to general corrosion in acids
  • Excellent resistance to erosion corrosion
  • Excellent resistance to corrosion fatigue
  • Good mechanical strength
  • Excellent resistance to stress corrosion cracking (SCC) in chloride bearing environments

Super duplex stainless steel suppliers

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