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Duplex Steel Corrosion Resistance, Duplex Steel Suppliers

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Duplex Steel Corrosion Resistance, Duplex Steel Suppliers

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Duplex stainless steel (Duplex Steel Corrosion Resistance)

Duplex stainless steels are called “duplex” because they have a two-phase microstructure consisting of grains of ferritic and austenitic stainless steel. The picture shows the yellow austenitic phase as “islands” surrounded by the blue ferritic phase. When duplex stainless steel is melted it solidifies from the liquid phase to a completely ferritic structure. As the material cools to room temperature, about half of the ferritic grains transform to austenitic grains (“islands”). The result is a microstructure of roughly 50% austenite and 50% ferrite.

The duplex structure gives this family of stainless steels a combination of attractive properties:

Strength: Duplex stainless steels are about twice as strong as regular austenitic or ferritic stainless steels. 

Toughness and ductility: Duplex stainless steels have significantly better toughness and ductility than ferritic grades; however, they do not reach the excellent values of austenitic grades. 

Corrosion resistance: As with all stainless steels, corrosion resistance depends mostly on the composition of the stainless steel. For chloride pitting and crevice corrosion resistance, their chromium, molybdenum and nitrogen content are most important. Duplex stainless steel grades have a range of corrosion resistance, similar to the range for austenitic stainless steels, i.e from Type 304 or 316 (e.g. LDX 2101©) to 6% molybdenum (e.g. SAF 2507©) stainless steels.

Stress corrosion cracking resistance: Duplex stainless steels show very good stress corrosion cracking (SCC) resistance, a property they have “inherited” from the ferritic side. SCC can be a problem under certain circumstances (chlorides, humidity, elevated temperature) for standard austenitics such as Types 304 and 316.

Cost: Duplex stainless steels have lower nickel and molybdenum contents than their austenitic counterparts of similar corrosion resistance. Due to the lower alloying content, duplex stainless steels can be lower in cost, especially in times of high alloy surcharges. Additionally, it may often be possible to reduce the section thickness of duplex stainless steel, due to its increased yield strength compared to austenitic stainless steel. The combination can lead to significant cost and weight savings compared to a solution in austenitic stainless steels.

 

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INDUSTRY WE SERVE Duplex Steel

  • » Duplex Steel uses in Oil and Gas Pipeline
  • » Duplex Steel uses in Chemical Industry
  • » Duplex Steel uses in Plumbing
  • » Duplex Steel uses in Heating
  • » Duplex Steel uses in Oil & Gas Industry
  • » Duplex Steel uses in Water Supply Systems
  • » Duplex Steel uses in Paper & Pulp Industry
  • » Duplex Steel uses in Power Plant
  • » Duplex Steel uses in Fabrication Industry
  • » Duplex Steel uses in General purpose applications
  • » Duplex Steel uses in Food Processing Industry
  • » Duplex Steel uses in Structural Pipe
  • » Duplex Steel uses in Heat Exchangers
  • » Duplex Steel uses in also used for other industrial purpose etc.

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