Super Duplex Stainless Steel

Ocean International Suppliers, Inc 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)

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

For a reference list of installations and applications, see our Super Duplex Project page.

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 1980’s to denote highly alloyed, high-performance "super" duplex steel with a pitting resistance.

BENEFITS OF SUPER DUPLEX STAINLESS STEEL
  • 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.
SUPER DUPLEX APPLICATIONS
  • 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.

For more information regarding Super Duplex Stainless Steel alloys, visit our site containing “An Introduction to Super Duplex Stainless Steels”: www.super-duplex.com

UNS S32750
C Cr Mn Mo N Ni P S Si
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
C Cr Cu Mn Mo N Ni P S Si W
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)
C Cr Cu Mn Mo N Ni P S Si
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