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ASME B31.3-2016 <br /> Chapter III <br /> Materials <br /> 323 GENERAL REQUIREMENTS 323.2.1 Upper Temperature Limits, Listed <br /> Materials. A listed material may be used at a tempera- <br /> Chapter III states limitations and required qualifica- ture above the maximum for which a stress value or <br /> tions for materials based on their inherent properties. rating is shown, only if <br /> Their use in piping is also subject to requirements and (a) there is no prohibition in Appendix A or elsewhere <br /> limitations in other parts of this Code [see para.300(d)]. in the Code <br /> See also para. 321.1.4 for support materials, and (b) the designer verifies the serviceability of the mate- <br /> Appendix F, para. F323, for precautionary rial in accordance with para. 323.2.4 <br /> considerations. 323.2.2 Lower Temperature Limits, Listed (16) <br /> Materials. See Appendix F, para. F323.2.2. <br /> 323.1 Materials and Specifications (a) A listed material may be used at any temperature <br /> not lower than the minimum shown in Table A-1 or <br /> Table A-IM,provided that the base metal,weld deposits, <br /> 323.1.1 Listed Materials. Any material used in pres- and heat-affected zone (HAZ) are qualified as required <br /> sure containing piping components shall conform to a by the applicable entry in Column A of Table 323.2.2. <br /> listed specification except as provided in para. 323.1.2. (b) For carbon steels with a letter designation in the <br /> Min. Temp. column of Table A-1 or Table A-IM, the <br /> 323.1.2 Unlisted Materials. Unlisted materials may minimum temperature is defined by the applicable <br /> be used provided they conform to a published specifica- curve and Notes in Fig. 323.2.2A. If a design minimum <br /> tion covering chemistry,physical and mechanical prop- temperature—thickness combination is on or above the <br /> erties, method and process of manufacture, heat curve,impact testing is not required. <br /> treatment, and quality control, and otherwise meet the (c) A listed material may be used at a temperature <br /> requirements of this Code. See also ASME BPV Code lower than the minimum shown in Table A-1, <br /> Section II,Part D,Appendix 5. Allowable stresses shall Table A-IM, or Fig. 323.2.2A (including Notes), unless <br /> be determined in accordance with the applicable allow- prohibited in Table 323.2.2, Table A-1, Table A-IM, or <br /> able stress basis of this Code or a more conservative elsewhere in the Code,and provided that the base metal, <br /> basis. weld deposits, and HAZ are qualified as required by <br /> the applicable entry in Column B of Table 323.2.2. <br /> 323.1.3 Unknown Materials. Materials of unknown (d) Figure 323.2.213 provides a further basis for the <br /> specification shall not be used for pressure-containing use of carbon steels covered by paras.323.2.2(a)and(b), <br /> piping components. without impact testing,when all of the following apply: <br /> • not in elevated temperature service <br /> 323.1.4 Reclaimed Materials. Reclaimed pipe and . not expected to experience shock loading or ther- <br /> other piping components may be used, provided they mal bowing <br /> are properly identified as conforming to a listed or pub- . does not contain welds between dissimilar materi- <br /> lished specification (para. 323.1.1 or 323.1.2) and other- als (e.g., <br /> e. austenitic welded to ferritic) <br /> wise meet the requirements of this Code. Sufficient g <br /> • stress ratio defined in Fig. 323.2.213 is less than one <br /> cleaning and inspection shall be made to determine min- <br /> imum wall thickness and freedom from imperfections (1) For design minimum temperatures of —48°C <br /> that would be unacceptable in the intended service. (-55°F) and above, the lowest temperature without <br /> impact testing (exemption temperature) determined in <br /> paras.323.2.2(a)or (b),for the given material and thick- <br /> 323.2 Temperature Limitations ness,may be reduced by the amount of the temperature <br /> reduction provided in Fig. 323.2.213 for the applicable <br /> The designer shall verify that materials that meet other stress ratio. If the resulting temperature is lower than <br /> requirements of the Code are suitable for service the design minimum temperature,impact testing of the <br /> throughout the operating temperature range. material is not required.Where this is applied,the piping <br />