Ceramic Media is the most commonly used tumbling media for deburring and surface finishing on steel. This is due to the fact that Ceramic Media is heavier and more aggressive than most other tumbling media and that steel is harder than many other metals (i.e., aluminum, copper, brass, etc.).
The 17-4 stainless steel part on the right in this picture has sharp edges and machining lines that need to be removed. In as little as 1 hour, a general purpose Ceramic Cone in a vibratory tumbler resulted in a uniform, matte surface finish and slightly rounded edges.