I asked about stainless on the GURU'S DEN @ ANVILFIRE.COM. I was forging 300 series stainless items for the bathroom and they were rusting. "Quenchcrack's" response - Friday, 08/22/08 19:10:39 EDT
- Glenn, if this is a policy violation I urge you to delete this post This does NOT violate IForgeIron policy but is in direct violation of Anvilfire policy. Anvilfire policy is that NO AMNONT of text can be copied from the Anvilfire site, no matter how small, without permission from the Anvilfire. The responce has been reworded to pass along the information without violating the Anvilfire policy.
The stainless steel 300 series is high in nickel and chromium. 300 series with an L is for low carbon and you most likely, by getting it hot enough to form chromium carbides, depleted the chromium. The surface formation of chromium oxide is used to protect it from additional oxidation, which will not be cured by surface passivization. The carbides must be dissolved to release the chromium. Heating to 1800F-2000F and water quench will release them, and dissolve the chromium barbides which will prevent their re=precipitation. Use the L version in the future, as it does not require the additional heat treatment.
This I did with later items – heating to bright red-orange and quenching. Cant tell you if this worked or not – OK so far.