ASME SA268 pdf free download

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 general corrosion- resisting and high- temperature service. Most of these grades are commonly known as the “*straight chro- mium” types and are characterized by being ferromagnetic. Two of these grades, TP410 and UNS S41500 (Table 1), are amenable to hardening by heat treatment, and the high- chromium, ferritic alloys are sensitive to noteh-brittleness on slow cooling to ordinary temperatures. These features should be recognized in the use of these materials. Grade TP439 is used primarily for hot-water tank service and does not require post-weld heat treatment to prevent attack of the heat affected zone. 1.2 An optional supplementary requirement is pro- vided, and when desired, shall be so stated in the order. 1.3 The values stated in either inch-pound units or S units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the“M” designation of this specification is specified in the order.
2. Referenced Documents 2.1 ASTM Standards: A 480/A 480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip A 763 Practices for Detecting Susceptility to Intergranu- lar Attack in Ferritic 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 UItrasonic Examination of Metal Pipe and Tubing E 273 Practice for Ultrasonic Examination of the Weld Zone of Welded Pipe and Tubing
3. Terminology
3.1 Lot Definitions: 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 final 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. If the final heat treatment is in a continuous furnace, the number of tubes of the same size and from the same heat in a lot shall be determined from the size of the tubes as given in Table 2. 3.1.2 For tensile and hardness test requirements, the term lot applies to all tubes, prior to cutting, of the same nominal diameter and wall thickness that are produced from the same heat of steel. If final heat treatment is in a batch-type furnace, a lot shall include only those tubes of he same size and the same heat that are heat treated in the same furmnace charge. If the final heat treatment is in a continuous furnace, a lot shall include all tubes of the same size and heat, heat treated in the same furmace at the same temperature, time at heat, and furnace speed. Ordering Information.ASME SA268 pdf download.