Stainless Steel Mechanical Tubing ASTM A511 304 304L 309S 310S 316 316L 317 321 347 Mechanical Tubing Outside Diameter:31.75 - 323mm; 1 1/4" - 12" ASTM A511 304 304L 309S 310S 316 316L 317 321 347 Mechanical Tubing Wall Thickness:1.24 - 50 mm etc; ASTM A511 304 304L 309S 310S 316 316L 317 321 347 Mechanical Tubing Standards(Norm):EN 10216-5; EN 10294-1, EN 10294-2, EN 10297-2, DIN 17456, DIN 17458, DIN 2462, DIN 17455 ASTM A511 304 304L 309S 310S 316 316L 317 321 347 Mechanical Tubing Standards(Norm):ASTM A213, A269, A312, A511, A789, A790, A928, A999, A1016, ASTM B161, ASTM B163, ASTM B165, ASTM B167, ASTM B338, ASTM B407, ASTM B423,ASTM B444,ASTM B619, ASTM B622, ASTM B626, ASTM B668, ASTM B677, ASTM B829 Detailed Images About Us Our Service Stainless Steel Tube Conservation: I. Clean frequently with a cleaner and water. Any clleaner that is safe for glass is usually safe for stainless steel. II. Scrub off all rust from these objects with a scrubbing pad or steel wood pad. This means getting rid of rust from pots and pans before putting them into a stainless steel sink or on top of a stainless steel stove. III. Put a rubber mat at the bottom of the stainless steel sink before placing rusted pots and pans (such as cast iron cookware) in the sink. IV. Apply a thin layer of lubricant (such as mineral oil) to the surface of the stainless steel. This prevents rust from forming. V. Inspect equipment frequently, if you notice discoloration, tarnish or water stains, increase the frequency of your fresh water rinses to reduce accumulated chemicals.China Stainless Steel Seamless Tube factory website:http://www.zhonglitube.com/stainless-steel-seamless-tube/