ASME SA268-2010 pdf free download.SPECIFICATION FOR SEAMLESS AND WELDED FERRITIC AND MA RTENSITIC STAINLESS STEEL TUBING FOR GENERAL SERVICE.
1.1 This specification covers a number of grades of nominal-wall-thickness, stainless steel tubing for gcneral cono on-resisting and high-temperature service. Most of these grades are commonly known as the siraight-chromium” types and are characterized by being ferromagnetic. Two of these grades. TP4I() uwl (iNS S4l500 tTahle I). are amenable to hanlening by heat treatment, and the highchromium. ferntic alloys arc sensitive to notch—brittleness on slow cooling to ordnsary temperatures. These features should be recognized in the use of these matenals. Grade TP439 is used primarily ftr hoe-water tank service and does not require post-weld heat treatment to prevent attack of the heat affected zcrne.
1.2 An optional supplementary requirement is provided. and when desired, shall he so stated in the aider.
ii The values sLated in either inch-pound units or SI units are to be regarded separately as standard. Within the test, the SI units are shown in brackets. The values stated in each system are not esaci equisalenis; therefore, each system must be used independently of the other. Combining values from the two sys*elns may result in nonconformance with the specification. The inch-pound units shall apply unless the “M” designation of this specification is spec ihed in the aider.
2. ReFerenced I)ocuments
2.) ASTM Srandarch:
A 480/A 480M Specilication for General Requirements for Flat-Rolled Stainless and Heat-Resisting Srecl Plate. Sheet, and Strip
A 763 Practices for Detecting Susceptibility to Intergranular Attack in Fcfritic Stainless Steels
A 1016/A 1016M Specification for General Requirements for Ferritic Alloy Steel. Austenitic Alloy Steel, and Stainless Steel Tubes
E 213 Practice for Ultrasonic Esamination of Metal Pipe and Tubing
E 273 Practice for Ultrasonic Esaminaliun of the Weld Zone of Welded Pipe and Tubing
3. Terminology
3.1 Lot Defl,,ition.c:
3.1.1 For flange and flaring requirements, the term lot applies to all tubes, prior to cutting. of the same nominal size and wall thickness that are produced from the same heat of steel. If lina] heat treatment is in a batch-type furnace, a lot shall include only those tubes of the same size and from the same heat that are heat treated in the same furnace charge. lithe final heat treatment is in a continuous furnace, the number of tubes of the same size and from the same beat in a lot shall be determined from the site of he tubes as gisen in Table 2.
3.1.2 For tensile and hardness test requirements, the term lot applies to all tubes, prior to culling, of the same nominal diameter and wall thickness that arc produced from the same heat of steel. II final heat treatment is in a batch-type furnace, a lot shall include only those tubes of the same size and the same heat that are heal treated in the same lumace charge. lithe linal heat treatment is in a continuous furnace, a hit shall include all tubes of the same size and heat, heat treated in the same furnace at the same temperature, time at heat, and furnace speed.
4. Ordering Information
4.1 It is the responsibility of the puiehaser to specify all requircmenLs that are necessary far matenal ordered.