Excessive temperature on the wall of the catalytic cracking regenerator; after shutdown, internal metallographic analysis revealed ferrite + pearlite, with a grain structure at grade 4 – what does this mean?
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This post was last edited by zhou85405989 on 2017-10-31 at 11:10. The wall temperature of the catalytic cracking regenerator was too high; after shutting down the unit, an internal metallographic analysis was conducted: ferrite + pearlite, with a grain size of grade 4. What does this mean? I’m a newcomer seeking help – please, those with more experience, could you provide some information on this topic? Is a grain size of grade 4 serious? What will be the consequences? What should the normal value be? Thank you all
The tolerance inspection rating is 3 or above; the lining is repaired and left untreated. Measure the hardness; it’s not easy to conduct strength tests. For research on ballitization, refer to the DL/T 786-2001 standard – actually, there is a significant discrepancy between this standard and the actual performance in use, so it can be ignored if it does not affect the rating.