... handhold,decoration Model:201,301,304. 1)stainless steel tube(welded) usded for door,window,guard, ... in both side and accurated size Name stainless steel tubeItemsSquare pipes, round pipes, oval pipes, ... rot test, heat treatment, NDT Chemical Composition of Material MaterialComposition201202304316430C≤0.15≤0.15≤0.08 ... 253<200<200 different types of high qualified stainless steel pipe for construction use