These values arc a primary basis for establishing the allowable stresses and design stress intensities. The information in the Mininiuin Tensile Strength arid Min- inium Yield Strength columns is nonmandatory. When there is a conflict between the P-n~~mber and Group ~iuniber information in these stress tables and that in Section IX. the primary source for this infc)rn~ation is Tablc QWIQB-421- in Section 1X. The information in thc P-Number and Group Number colunlns is also mandatory: however. SizeIThickness, and External Preswre Chart Number is mandatory. Where provided, the information in the columns for Product Form, Specification Number. Number information is used as the basis of the sorting scheme for materials and is allnost always mandatory. with regard to the mandatorylnonmandatory nature of the information. The only difference between Tables I A and 2A. for which no type or grade is listed, the UNS number is the grade. For specifications for which no type or grade is listed. This is primarily true for the nonstainless-steel-alloys in these tables. The information in the Alloy DesignationIUNS Number column is nonmanda- tory for specifications for which a grade or type is provided. these nominal compositions are the primary sorting used in these two tables. the information in the Nominal Com- position column is nonmandatory ant1 is for information only. Additional requirements for particular types of construction must also be obtained from the rules governing the construction. provide the complete description of material in the context of the allowable stresses or design stress intensities.

The specifications and grades or types, coupled with the assigned Notes for each line.

(b ) GXX: general requirements (c) HXX: heat treatment requirements (d ) SXX: size requirements ( e ) TXX: defining onset of time-dependent behavior If') WXX: welding requirements ( ( I ) EXX: defining onset of values based on successful experience in service 3, and 4 frequently have essential information referenced in the Notes column. It is vital to recognize that lines of information in Tables IA. The information and restrictions provided in the Notes found throughout the various stress tables provided in Subpart 1 of Section 11. The purpose of this Statement of Policy is to clarify which information in the stress tables is ~nandatory and which is not. STATEMENT OF POLICY ON INFORMATION PROVIDED IN THE STRESS TABLES

2015 asme bpvc section ix