ASME Ⅸ卷材料分类P-No. 和Group-No. 怎样理解Group-No.？

ASME Ⅸ卷材料分类P-No. 和Group-No. 请问怎样理解Group-No. 呢？

母材评定的分组是以材料的化学成份和力学性能吧？P-No. 和Group-No. 分别代表了什么呢

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我记得在ASME31.3中（我仅看过ASME31.3）有P-No 和Group -No的定义和分类。

P-Nos. and Group Nos. from BPV Code, Section IX, QW/QB-422.

见 ASME BPVC.IX-2015  SECTION IX  Welding, Brazing, and Fusing Qualifications

ARTICLE IV WELDING DATA

QW-420 BASE METAL GROUPINGS       Page 92

Table QW/QB-422  Ferrous/Nonferrous P-Numbers Grouping of Base Metals for Qualification

学习下，以前真没注意过

QW-200.3  To reduce the number of welding procedure qualifications required,  P‐Numbers are assigned to base metals dependent on characteristics such as composition, weldability, and mechanical properties, where this can logically be done; and for steel and steel alloys  Group Numbers are assigned additionally to P‐Numbers. These Group Numbers classify the metals within P‐Numbers for the purpose of procedure qualification where toughness requirements are specified. The assignments do not imply that b as e metals maybe indiscriminately substituted for a base metal which was used in the qualification test without consideration of the compatibility from the standpoint of metallurgical properties, postweld heat treatment, design, mechanical properties, and service requirements. Where toughness is a consideration, it is presupposed that the base metals meet the specific requirements.