One of my first pipes was a peterson Belgique, which I believe is one of their least expensive pipes with a vulcanite stem. The stem has not dulled or worn in the slightest since purchase.
I always wear a beeswax based lip balm while smoking and find this helps to protect the stems. I would suggest you try this if you re having an issue with vulcanite stems oxidizing very quickly. In fact, it's probably a good idea to run the lip balm directly in to the stem surface, let it sit and then buff it off. Seems like you may have acid-rich saliva.
I always wear a beeswax based lip balm while smoking and find this helps to protect the stems. I would suggest you try this if you re having an issue with vulcanite stems oxidizing very quickly. In fact, it's probably a good idea to run the lip balm directly in to the stem surface, let it sit and then buff it off. Seems like you may have acid-rich saliva.