... rolled Surface: Annealing, pickling, sand-blasting Production procedure: Raw elements(C, Fe, Ni, Mn, Cr, Cu etc., )--smelted into ingots ... , we usually add "a", "b", "c" to the Height to distinguish. The channel's specification range is from 5-40 ... steel frame structures, automobile manufacturing and other industrial structure use. It is mostly used with beam.Pictures Show 316 stainless steel channel