How to remove the dense Fe3O4 (irregularities) on the high-pressure sealing surface?
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Fe3O4 was formed on the sealing surface of the steam control valve of the turbine under high temperature and pressure conditions (510°C, 12.0 MPa); this was discovered only after the valve was removed. The Fe3O4 scale layer is uneven; it cannot be removed by hand with a grinding stone, nor can it be polished forcefully using a grinder, as there is a risk of damaging the sealing surface. If it is reinstalled as is without any treatment, there is a concern that it may leak due to poor sealing. I would like to ask experts how to handle this, thank you.
Would it be good to reprocess the sealing surface, remove the oxide layer, then perform surfacing welding and reprocess the sealing surface again?
Try it with a polishing pad; it should work fine
Thank you all for your help. We don’t have proper gold processing facilities here; it’s not possible to reprocess the material after surfacing. I’ll give the polishing pad a try.