Stainless Steel Air Header Jiangsu Tonx Mechanical Equipment Co., Ltd. Base Info Trademark:ZonxOrigin:China Description Pre:Black Rectangular Pipe Cold Rolled Pre Galvanized Welded Square / Rectangular Steel Pipe/Tube/Hollow Section Next:GB/T 3077 20mn2 30mn2 35mn2 40mn2 45mn2 50mn2 27simn 35simn Steel Pipe