Duplex & Super Duplex Steel pipes

Duplex Steel Pipe was originally developed in Sweden back in the 1940’s . Duplex Steel Pipes were originally created to combat corrosion problems caused by chloride-bearing cooling waters and other aggressive chemical process fluids.
Called Duplex Steel Pipe 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 chemical composition based on high contents of Cr and Mo, improves intergranular and pitting corrosion resistance, respectively. Additions of nitrogen can promote structural hardening by interstitial solid solution mechanism, which raises the yield strength and ultimate strength values without impairing toughness. Moreover, the two-phase microstructure guarantees higher resistance to pitting and stress corrosion cracking in comparison with conventional stainless steels.
The first-generation grades were alloys of chromium, nickel and molybdenum and while they provided good performance characteristics, welds had low toughness due to excessive ferrite, which limited the use of Duplex pipe steel to a few specific applications.

Duplex Steel Seamless Pipe:

Size : 1/2"NB TO 12 "NB IN
Schedule: SCH20, SCH30, SCH40, STD, SCH80
Type : Welded / Fabricated / Seamless
Length : Single Random, Double Random & Cut Length. 
End : Plain End, Beveled End.

MATERIALS :
Duplex Steel Seamless Pipe – Duplex SS Seamless Pipe
ASTM A790 UNS S31803, S32205, S32750, S32760

Duplex Steel Welded Pipe:

Size : 1/2"NB TO 12 "NB IN
Schedule: SCH20, SCH30, SCH40, STD, SCH80
Type : Seamless / ERW / Welded / Fabricated / LSAW Pipes
Form : Round, Square, Rectangular, Hydraulic Etc.
Length : Single Random, Double Random & Cut Length. 
End : Plain End, Beveled End, Treaded. 

MATERIALS :
Duplex Steel Welded Pipe – Duplex SS Welded Pipe
ASTM A790 UNS S31803, S32205, S32750, S32760

Duplex Steel Fabricated Pipe:

Size : 8"NB TO 24 "NB IN
Schedule: SCH20, SCH30, SCH40, STD, SCH80
Type : Welded / Fabricated
Length : Single Random, Double Random & Cut Length. 
End : Plain End, Beveled End.

MATERIALS :
Duplex Steel Fabricated Pipe – Duplex SS Fabricated Pipe
ASTM A790 UNS S31803, S32205, S32750, S32760