Duplex/super duplex stainless steels

Stainless steels are a family of corrosion-resistant steels that contain at least 10.5% of chromium. Apart from chromium, these steels are commonly alloyed with nickel, molybdenum, titanium, niobium and other elements. 

Their mechanical properties and application depend on their chemical composition. The durability and serviceability of a manufactured product depends on a careful choice of the right grade of steel.

Duplex stainless steels have very good mechanical properties:

  • high strength,
  • good toughness
  • and very good corrosion resistance especially towards stress corrosion cracking and corrosion fatigue.

These steels also have good weldability and reasonable formability.

They have a typical ferritic - austenitic microstructure in a proportion representing the ratio of 50:50. The proportion of chromium is around 22%, nickel amounts to 5%. Steel also contains molybdenum and soul