I am trying to find a supplier to manufacturer 2 identical eccentric cones. Material is SS316L and customer will allow one piece rolled/welded eccentric cone or machined. My problem is that I need 6.35mm wall thickness due to temp and creep rate. The small ID is 5.1" and large ID is 9.5". Piece is 12" long. I can not find anyone to machine this unless I go to EDM machining at 1000.00 an inch and I can not find a roller to go over 3/16" thickness with 5.1" diameter. Anyone have any suggestion. I should also add that I need to manufacturer in non-contamination enviroment. No carbon steel can contact stainless steel at any time including shipping. Looking for possible vendor for work that someone has used in past or alternative method of making cone.