Alloy 2507

Definition - What does Alloy 2507 mean?

Alloy 2507 is a super duplex stainless steel alloy with a mix of 25% chromium, 7% nickel and 4% molybdenum. The chemical composition of this alloy is as follows:

  • Cr – 25%
  • Ni – 7%
  • Mo - 4%
  • C – 0.030% max
  • N – 0.24% to 0.32%
  • Mn – 1.2% max
  • Si – 0.8% max
  • Cu – 0.5% max
  • P – 0.035% max
  • S – 0.020% max
  • Fe – Balance or remaining percentage

Alloy 2507 is also known as Super Duplex 2507.

Corrosionpedia explains Alloy 2507

Industrial nomenclature or the recommended grade for Alloy 2507 is UNS S32750.

Alloy 2507 contains high quantities of chromium, nickel, molybdenum and nitrogen which makes it an excellent inhibitor to chloride pitting and crevice corrosion attack. This alloy has a duplex structure that provides exceptional resistance to chloride stress corrosion cracking. This alloy possesses excellent mechanical properties in terms of light weight and durability, thus translating to lower fabrication costs for mechanical materials. It is resistant to corrosion by organic acids such as formic acid and acetic acid. It also shows corrosion resistance to all inorganic acids that contain chlorides.

Its use is limited to applications below 315 °C (599 °F); at higher temperatures it loses both corrosion resistance and its toughness properties.

Some of the industries and applications where Alloy 2507 is used are:

  • Desalination equipment
  • Chemical process pressure vessels, piping and heat exchangers
  • Marine applications
  • Flue gas scrubbing equipment
  • Pulp and paper mill equipment
  • Offshore oil production
  • Oil and gas industry equipment
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