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Duplex Stainless Steel Seamless Pipes

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Duplex & Super Duplex Steel
GradeUNS No.EN No.CCrNiMoOthers
Alloy 2205318031.44620.0321.00 - 23.004.50 - 6.502.50 - 3.50N : 0.08 - 0.20
Alloy 2507327501.44100.0324.00 - 26.006.00 - 8.003.00 - 4.50N: 0.24 - 0.32
Alloy 32760327601.45010.0524.00 - 26.006.00 - 8.003.00 - 4.00N:0.20 - 0.30

Alloy 2205Alloy 2507Alloy 32760
Alloy NamesW.Nr - 1.4462 / UNS No 31803W.Nr - 1.4410 / UNS No 32750W.Nr - 1.4501 / UNS No 32760
Product RangeSeamless St & U tubes
6 mm OD x 0.7 mm to 4" NB x sch 40
Seamless St & U tubes
6 mm OD x 0.7 mm to 50.8 mm OD x 3 mm thk
Seamless St & U tubes
6 mm OD x 0.7 mm to 50.8 mm OD x 3 mm thk
SpecificationsSA 789 / 790SA 789 / 790
SA 789 / 790
Major Chemical
Composition
Ni - 4.50 / 6.50
Cr - 21.00 / 23.00
Mo - 2.50 / 3.50
Ni - 6.00 / 8.00
Cr - 24.00 / 26.00
Mo - 3.00 / 4.50
Ni - 6.00 / 8.00
Cr - 24.00 / 26.00
Mo - 3.00 / 4.00
Cu - 0.50 / 1.00
W - 0.50 / 1.00

Key FeaturesApplications
Alloy 2205
  • Higher strength than austenitic stainless steels
  • Excellent corrosion resistance in seawater & industrial acids
  • Excellent resistance to intergranular, pitting & crevice corrosion
  • Good sulphide stress corrosion resistance
  • Lower thermal expansion & higher heat conductivity than austenitic
Alloy 2507
  • Excellent corrosion resistance in a wide variety of corrosive chemicals.
  • Outstanding resistance to pitting and crevice corrosion in seawater and other chloride
  • High strength compared to austenitic and 22%Cr duplex stainless steels.
  • Excellent ductility and impact strength at both ambient and sub-zero temperatures.
  • High resistance to abrasion, erosion and cavitation erosion.
  • Excellent resistance to stress corrosion cracking in chloride containing environments.
  • Listed in NACE MR 01 75 for sour service.
  • ASME Approval for Pressure Vessel application.
Alloy 32760
  • High strength compared to austenitic and 22% chrome duplex stainless steels.

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