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Time-temperature diagram of intergranular corrosion in austenitic stainless steels

Figure gives the approximate time for austenitic stainless steels, grade A2 (18/8 steels), with different carbon contents in the temperature zone between 550 °C and 925 °C before risk of intergranular corrosion occours.

Time-temperature diagram of intergranular corrosion in austenitic stainless steels

 

The following stainless steel grades are recommended if there is a risk of intercrystalline corrosion:

  • A3 or A5 stabilized
  • A2 or A4 with max. carbon content 0,030 % (marked with «L»)
  • A8 

 

Note:

With lower carbon contents, the resistance against intergranular corrosion is improved.