Designation: A 268/A 268M –04 Standard Speci?cation for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service 1 This standard is issuedunder the ?xed designationA 268/A 268M; the number immediately following the designation indicates the year of original adoption or, in the caseof revision, the year of last revision. A number in parenthesesindicates the year of la