18Cr-8Ni Austenitic Stainless Steel

Steel name: 18Cr-8Ni Austenitic Stainless Steel
Diagram No.: 2936
Type of diagram: TTS
Chemical composition in weight %: No data
Steel group: Stainless steels
Note: Time-temperature sensitization and intergranular corrosion. Time-temperature relationship for susceptibility to intergranular corrosion of 18%Cr-8%Ni austenitic stainless steel with various C contents as determined by the Strauss (boiling acidified copper sulphate) test. Below approximately 550oC diffusion rates are too low for significant sensitization to accur in a short time, equally, above approximately 850oC chromium carbide precipitation is not only slow but also diffusion rates are sufficiently high to replenish the Cr-deficient region. The removal of sensitization in this manner by prelonged holding at 900-950oC is sometimes termed a 'stabilizing heat treatment'.
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