tailieunhanh - Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service

"Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service" covers a number of grades of nominal-wall-thickness, stainless steel tubing for general corrosion-resisting and high-temperature service. Most of these grades are commonly known as the “straight-chromium” types and are characterized by being ferromagnetic. Two of these grades, TP410 and UNS S 41500, are amenable to hardening by heat treatment, and the high-chromium, ferritic alloys are sensitive to notch-brittleness on slow cooling to ordinary temperatures. | Designation A268 A268M 10 Reapproved 2016 Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service1 This standard is issued under the fixed designation A268 A268M the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the . Department of Defense. 1. Scope A763 Practices for Detecting Susceptibility to Intergranular 2 This specification covers a number of grades of Attack in Ferritic Stainless Steels nominal-wall-thickness stainless steel tubing for general A1016 A1016M Specification for General Requirements for corrosion-resisting and high-temperature service. Most of these Ferritic Alloy Steel Austenitic Alloy Steel and Stainless grades are commonly known as the straight-chromium types Steel Tubes and are characterized by being ferromagnetic. Two of these E213 Practice for Ultrasonic Testing of Metal Pipe and grades TP410 and UNS S 41500 Table 1 are amenable to Tubing hardening by heat treatment and the high-chromium ferritic E273 Practice for Ultrasonic Testing of the Weld Zone of alloys are sensitive to notch-brittleness on slow cooling to Welded Pipe and Tubing ordinary temperatures. These features should be recognized in the use of these materials. Grade TP439 is used primarily for 3. Terminology hot-water tank service and does not require post-weld heat Lot Definitions treatment to prevent attack of the heat affected zone. For flange and flaring requirements the term lot An optional supplementary requirement is provided and applies to all tubes prior to cutting of the same nominal size when desired shall be so stated in the order. and wall thickness that are produced from the same heat of steel.