... : 201 , 202 , 301 , 304 , 304L , 316 , 316L.etc.3.Polishing : 600#, 400# , 320# , 240# , 180# .etc.4.Wall thickness ... Company mainly deals with galvanized pipe, steel tube, high tunnel pipe, square tube, welded pipe manufacturing and provides services for ... Company mainly deals with galvanized pipe, steel tube, high tunnel pipe, square tube, welded pipe manufacturing and provides services for ...