stainless steel round bar, hot rolled , cold drawn,polished,peeled,lap grinding,etc., 1.material grade: ... series-301,302,303,303Cu,304,304L,304Cu,316,316L,310,310S,309 400 series-410,416,420,430 ... hot rolled into black surface--pickling into acid liquid--cold drawn--polished by automatically machine--cutting into pieces--checking ... to contact with me stainless steel round bar 304, 304L, 321, 316, 316L