DUPLEX STEEL · TECHNICAL ANSWER

What is the difference between Duplex 2205 and Super Duplex 2507?

Super Duplex 2507 has higher chromium, molybdenum and nitrogen alloying than Duplex 2205, giving higher strength and greater resistance to pitting in severe chloride environments.

DETAILED EXPLANATION

2205 is widely used in chemical, pulp, marine and process service. 2507 is considered for more severe offshore, seawater and desalination conditions.

Fabrication, heat treatment, ferrite balance and corrosion testing are essential for both.

Key points

  • 2205: UNS S31803/S32205
  • 2507: UNS S32750
  • 2507 normally has higher PREN and strength
  • Service conditions determine selection
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