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UNS S31254 - SMO 254 -F44

Duplex stainless steels are so named due to their two-phase microstructure, which consists of stainless steel grains that are 50% austenitic and 50% ferritic. This type of steel has a number of advantages and is frequently preferred over conventional ferritic or austenitic stainless steels due to its increased strength – it is roughly twice as strong as these metals. Duplex stainless steels' increased yield strength enables the creation of thinner sections, resulting in significant weight savings. This property makes duplex stainless steel ideal for structural applications and pressure vessels.

Due to this property, duplex stainless steel is a popular choice for structural applications and pressure vessels. The 6Mo super austenitic steel combines a moderate tensile strength and high ductility with excellent resistance to corrosion in seawater and a variety of industrial environments. Typically, the alloy has a PREN of 42–44, which ensures that it has high resistance to pitting corrosion and also to crevice corrosion.

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SPECIFICATION :


  • F44 / UNS 31254
  • ASTM A276
  • ASTM A479
  • ASME SA479
  • W.1.4547
  • EN 10088-3
  • NACE MR0175 / ISO 15156-3
  • NACE MR0103 / ISO 17945

Chemical Composition :


Weight % C Si Mn S P Cr Ni Mo N Cu
Min. 19,50 17,50 6,00 0,18 0,50
Max. 0,020 0,80 1,00 0,010 0,030 20,50 18,50 6,50 0,25 1,00


Mechanical Properties :


Yield strength Rp0.2,MPa Tensile strength Rm,MPa Elongation[%] Hardness[HB] Impact, Charpy-V, -46ºC[J] Pre
All products ≥ 310 655 – 850 ≥ 35 ≤ 310 ≥ 45 ≥ 40






APPLICATION :


Typical applications for the 6Mo alloy:

  • Pumps
  • Valves
  • Chokes
  • Pipework/flanges and manifolds in oil and gas industry.
  • High resistance to general corrosion
Work Process

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