AAAASSSSMMMMEEEE PPPP--- …
AAAAAAAASSSSSSSSMMMMMMMMEEEEEEEE PPPPPPPP--------NNNNNNNNuuuuuuuummmmmmmm bbbbbbbbeeeeeeeerrrrrrrrssssssss ffffffffoooooooorrrrrrrr BBBBBBBBaaaaaaaasssssssseeeeeeee MMMMMMMMeeeeeeeettttttttaaaaaaaallllllll ssssssss iiiiiiiinnnnnnnn WWWWWWWWeeeeeeeellllllllddddddddiiiiiiii nnnnnnnngggggggg &&&&&&&& BBBBBBBBrrrrrrrraaaaaaaazzzzzzzziiiiiiii nnnnnnnngggggggg PPPPPPPPrrrrrrrroooooooocccccccceeeeeeee dddddddduuuuuuuurrrrrrrreeeeeeee To reduce the number of welding and brazing procedure qualifications required base metals have been assigned P-Numbers by the ASME BPVC. Ferrous metals which have specified impact test requirements have been assigned Group Numbers within P-Numbers.
P-Numbers Base Metal (Typical or Example) 1 Carbon Manganese Steels (four Group Numbers) 2 Not Used 3 Half Molybdenum or half Chromium, half Molybdenum (three Group Numbers) 4 One and a quarter Chromium, half Molybdenum (two Group Numbers) 5A Two and a quarter Chromium, one Molybdenum 5B Five Chromium, half Molybdenum or nine Chromium, one Molybdenum (two
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