... Pipe304L Stainless Steel Pipe Stainless Steel Tubes & Pipes are divided into square,rectangular and round types with ... 3, No.4, No.8, 8K, HL(Hair Line) ,Polished4.ShapeRound,rectangular,square5. Applications Petroleum, chemical industry ... chemical fiber, smelt, medical machinery, papermaking, heat preservation and refrigeration, mechanical equipment, food, electricity, water conservancy, architecture, ...