Duplex Stainless Steel

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

Duplex Stainless Steels
Ferritic Austenitic

UNS S31803    UNS S32205

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 XXS
150lbs thru 2500lbs
Round Bar 1/2" - 12"
Plate 1/8" - 3" thick

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

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.

BENEFITS OF DUPLEX STAINLESS STEEL
  • High strength
  • A cost-effective alternative to austenitic stainless steel 316L.
  • High resistance to pitting, crevice corrosion resistance
  • High resistance to stress corrosion cracking, corrosion fatigue and erosion,
  • Good sulfide stress corrosion resistance,
  • Low thermal expansion and higher heat conductivity than austenitic steels,
  • Good workability and weldability,
  • High energy absorption.
DUPLEX STAINLESS STEEL APPLICATIONS
  • Heat exchangers, tubes and pipes for production and handling of gas and oil,
  • Heat exchangers and pipes in desalination plants,
  • Pressure vessels, pipes, tanks and heat exchangers for processing and transport of various chemicals,
  • Pressure vessels, tanks and pipes in process industries handling solutions containing chlorides,
  • Rotors, fans, shafts and press rolls where the high corrosion fatigue strength can be utilized,
  • Cargo tanks, piping and welding consumables for chemical tankers.

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

UNS S31803
C Cr Mn Mo N Ni P S Si
0.030 max 21.0-23.0 2.00 max 2.50-3.50 0.08-0.20 4.50-6.50 0.030 max 0.020 max 1.00 max

 

UNS S32205
C Cr Mn Mo N Ni P S Si
0.030 max 22.0-23.0 2.00 max 3.00-3.50 0.14-0.20 4.50-6.50 0.030 max 0.020 max 1.00 max

Duplex - Super Duplex - 6% Moly - Titanium
Bar - Plate - Tubing - Flanges - Pipe & Pipe Fittings - Valves