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What Is Duplex Stainless Steel?

Posted by Dave Olsen on 12/30/19 8:22 AM

Duplex stainless steels are alloys with metallurgical structures generally regarded as being approximately equal parts of austenite and ferrite, with a 60/40, 40/60-phase distribution being the envelope widely considered as acceptable. The combination of austenite/ferrite produces alloys with twice the strength of conventional austenitic stainless steels.

Duplex stainless steels are virtually immune to stress corrosion cracking (the Achilles’ heel of common austenitic stainless steels) and are highly resistant to pitting and crevice corrosion. Possessing these characteristics, it is not surprising to find the majority of, but by no means all, applications to be seawater related.  Duplex stainless steels have many uses in offshore oil and gas production and naval equipment, particularly sub-surface.

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Topics: Ferrous Alloys, Duplex Stainless Steel

Ferralium Duplex Stainless Steel Material Profile

Posted by Dave Olsen on 2/25/16 2:17 PM


Ferralium® 255 (J32550 / Licensed by Langley Alloys)


Proprietary high strength duplex stainless steel

Properties – Why select this material

  • Outstanding corrosion and erosion resistance
  • Twice the strength of common austenitic stainless steels
  • Reduced section sizes because of strength may reduce weight.
  • Highly resistant to chloride stress corrosion cracking
  • Machining and welding similar to the austenitic stainless steels.
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Topics: Ferrous Alloys, Duplex Stainless Steel, Ferralium

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