Duplex S31803 & S32205
Super Duplex S32750 & S32760

6% Molybdenum Stainless Steels
6 Moly S31254, 6 Moly N08925, 6 Moly N08926
Inconel & Titanium Grades 1, 2, 5, 7, 9 & 12
Stainless Steel & Nickel Alloys

Seamless & Welded Tubing
Seamless & Welded Pipe
Alloy Pipe Fittings,
Alloy Flanges, Alloy Valves

Round Bar, Plate/Sheet
Specialty Forgings

Specializing in ON TIME delivery of Super Duplex, Duplex, Titanium, 254SMO and Nickel Alloys
When you need an alloy now, call Alloys Now. 863-607-6119 sales@alloys-now.com

3607 Ventura Dr. East, Lakeland, FL 33811, USA, Fax: 863-607-6602

Super Duplex Stainless Steel

UNS S32750 & UNS S32760

Super Duplex Plate/Sheet
Super Duplex Seamless & Welded Tube
Super Duplex Seamless & Welded Pipe
Super Duplex Round Bar
Super Duplex Flanges F53/F55
Super Duplex Specialty Forgings
Super Duplex Seamless & Welded BW Fittings

Alloys Now offers a large variety of products in Super Duplex Stainless Steel alloys such as tubing, seamless- and welded pipe, butt weld fittings, flanges, round bar and plate products:

Super Duplex Stainless Steel
Ferritic Austenitic

UNS S32750   UNS S32760   UNS S32550 (Ferralium 255)
1/16" - 2" OD 0.016" - 0.250" WT
3 mm - 50 mm OD 0.5 mm - 6.0 mm WT
1/2" - 6" OD 0.035" - 0.500" WT
12 mm - 150 mm OD 1.0 mm - 12.0 mm WT
Seamless & Welded
1/2" - 36" Sch 10S thru Sch XXS
Butt Weld Fittings
Seamless & Welded
1/2" - 36" Sch 10S thru Sch XXS
WN & Blind
1/2" - 36" Sch 10S thru Sch 40S
150lb - 300lb
Round Bar 1/2" - 12"
Plate 1/8" - 2" thick

The first-generation duplex stainless steels were developed more than 70 years ago in Sweden for use in the sulfite paper industry. Called duplex because of its mixed microstructure with about equal proportions of ferrite and austenite, duplex stainless steels are a family of grades, which range in corrosion performance depending on their alloy content. The term Super Duplex was first used in the 1980s to denote highly alloyed, high-performance "super" duplex steel with a pitting resistance.

  • High strength,
  • High resistance to pitting, crevice corrosion resistance.
  • High resistance to stress corrosion cracking, corrosion fatigue and erosion,
  • Excellent resistance to chloride stress-corrosion cracking
  • High thermal conductivity
  • Low coefficient of thermal expansion
  • Good sulfide stress corrosion resistance,
  • Low thermal expansion and higher heat conductivity than austenitic steels,
  • Good workability and weldability,
  • High energy absorption.
  • Heat exchangers, tubes and pipes for production and handling of gas and oil,
  • Heat exchangers and pipes in desalination plants,
  • Mechanical and structural components,
  • Power industry FGD systems,
  • Pipes in process industries handling solutions containing chlorides,
  • Utility and industrial systems, rotors, fans, shafts and press rolls where the high corrosion fatigue strength can be utilized,
  • Cargo tanks, vessels, piping and welding consumables for chemical tankers.
  • High-strength, highly resistant wiring.

UNS S32750
Carbon Chromium Manganese Molybdenum Nitrogen Nickel Phosphorus Sulfur Silicon  
0.030 max 24.0-26.0 1.20 max 3.0-5.0 0.24-0.32 6.0-8.0 0.035 max 0.020 max 0.8 max  

UNS S32760
Carbon Chromium Copper Manganese Molybdenum Nitrogen Nickel Phosphorus Sulfur Silicon Tungsten
0.03 max 24.0-26.0 0.5-1.0 1.0 max 3.0-4.0 0.2-0.3 6.0-8.0 0.03 max 0.01 max 1.0 max 0.5-1.0
Other: %Cr + 3.3%Mo + 16x%N -- 40 min

UNS S32550 (Ferralium 255)
Carbon Chromium Copper Manganese Molybdenum Nitrogen Nickel Phosphorus Sulfur Silicon
0.04 max 24.0-27.0 1.50-2.50 1.5 max 2.9-3.9 0.10-0.25 4.50-6.50 0.04 max 0.030 max 1.00 max

Trade Name UNS Super Duplex Industry Specifications Chemical Composition Min.Tensile
2" %
SAF 2507 UNS S32750 ASTM A182 F53, A240, A479, A789, A790, A815, A928, A949, A988
SAE J405
C 0.030 max
Mn 1.20 max
Mo 3.0-5.0
N 0.24-0.32
Ni 6.0-8.0
P 0.035 max
S 0.020 max
Si 0.8 max
116 80 15
  UNS S32760 ASTM A182 F55, A240, A276, A314, A473, A479, A789, A790, A815, A988
SAE J405
C 0.03 max
Cu 0.5-1.0
Mn 1.0 max
Mo 3.0-4.0
N 0.2-0.3
Ni 6.0-8.0
P 0.03 max
S 0.01 max
Si 1.0 max
W 0.5-1.0
Other %Cr+3.3x%Mo+16x%N = 40 min
109 80 15

This is a Duplex alloy stainless steel designed to feature high strength, resistance to pitting, stress corrosion cracking, erosion corrosion and corrosion fatigue, crevice corrosion and strong weldability.
Super Duplex Applications

Super Duplex Applications

Oil and gas industry equipment,
Offshore platforms, heat exchangers, process and service water systems, fire-fighting systems, injection and ballast water systems,
Chemical process industries, heat exchangers, vessels, and piping,
Desalination plants, high pressure RO-plants and seawater piping,
Mechanical and structural components, high strength, corrosion-resistant parts,
Power industry FGD systems, utility and industrial scrubber systems, absorber towers, ducting, and piping.

Super Duplex Corrosion Resistance

The high chromium and molybdenum content of Super Duplex makes it extremely resistant to uniform corrosion by organic acids like formic and acetic acid. Super Duplex also provides excellent resistance to inorganic acids, especially those containing chlorides.