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Description of ASTM-A268/A268M 2016ASTM A268/A268M-10-Reapproved2016Historical Standard: Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General ServiceASTM A268/A268MScope 1.1 This specification2 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 (Table 1), are amenable to hardening by heat treatment, and the high-chromium, ferritic alloys are sensitive to notch-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.
(A) For small diameter or thin walls, or both, tubing, where many drawing passes are required, a carbon maximum
of 0.015 % is necessary. Small outside diameter tubes are defined as those less than 0.500 in. [12.7 mm] in outside diameter and light wall tubes as those less than 0.049 in. [1.2 mm] in
average wall thickness (0.040 in. [1 mm] in minimum wall thickness).
(B) Plate version of CA6NM.
(C) Carbon plus nitrogen = 0.30 max.
(D) Nickel plus copper.
(E) Carbon plus nitrogen = 0.025 % max.
(F) Cb/(C + N) = 12 min.
1.2 An optional supplementary requirement is provided, and when desired, shall be so stated in the order. 1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order. Keywords ferritic stainless steel; seamless steel tube; stainless steel tube; steel tube; welded steel tube; ICS Code ICS Number Code 23.040.10 (Iron and steel pipes) DOI: 10.1520/A0268_A0268M-10R16 This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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