http://pastport.jp/user/kcmspecialsteel/timeline/310S%20Stainless%20Steel%20Pipe https://www.duplexstainlesssteelpipes.com/product/stainless-steel-pipe-supplier/ TP 310S STAINLESS STEEL PIPE SUPPLIER ,MANUFACTURERS, STAINLESS STEEL STORE, WE CAN MANUFACTURING SEAMLESS AND WELDED ,OD:6-2000MM THICKNESS:0.5-60MM. ja-JP