S-Numbers were assigned to materials that were acceptable for use by the ASME B31 Code or had been deemed acceptable Code Cases within the Boiler and Pressure Vessel Code, but which were not included in ASME Section II. In 2009, S-Numbers were removed from Section IX. This range of values needs to be clearly stated on the WPQ. QW-423.1 when a base metal shown in the left column is used for welder qualification, the welder is qualified to weld all combinations of base metals shown in the right column, including unassigned metals of similar chemical composition to these metals.
P-Numbers have been laid out in such a way that there are some identifiable alloy patterns. For example, some carbon steels like I-Beam listed in D1.1 will not be listed in ASME, even though they might both be considered to be plain carbon steel. Governing Code NomenclatureĪWS B2.1: M-Number (M for Material Number)Ĭode boundaries mainly fall along different industries, and materials unique to those industries will sometimes not overlap from one governing code body to the next. 5A are an entirely different group than P-No. It is important to note that each P-Number is considered a separate and unique number. P-Numbers are made of numbers and sometimes include letters. P-Numbers are assigned to base metals to reduce the number of welding and brazing procedure qualifications required to perform work. These materials are grouped based on their similar weldability and mechanical characteristics. P-Number Groupings per ASME Section IX What is a P-Number?Ī P-Number is an alphanumeric designation assigned to a group of materials.
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