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Section
IX of the ASME BPVC
ASME
P-Numbers
Structural
Welding
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ASME P-Numbers
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.
These assignments have been based on comparable base metal
characteristics, such as:
-
Composition
-
Weldability
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Brazeability
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Mechanical Properties
Indiscriminant substitution of materials in a set of
P-Numbers or Group Numbers may lead to problems or potentially failures.
Engineering assessment is necessary prior to a change in materials.
When a base metal with a UNS number Designation is assigned
a P-Number, then a base metal listed in a different ASME material specification
with the same UNS number shall be considered that P-Number.
The table below is a guide and is for instructive purposes
only. Anyone specifying materials or requirements should refer directly to
the ASME Boiler and Pressure Vessel Code to specify materials, P-Numbers,
procedures, or other requirements and not rely on the table below. The
table below is only a rather INCOMPLETE and APPROXIMATE summary of ASME data for
INSTRUCTIONAL USE ONLY. See ASME Boiler and Pressure Vessel Code for
materials specifications and P-Numbers.
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P-Numbers
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Base Metal (Typical or Example)
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1
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Carbon Manganese Steels (four Group
Numbers)
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2
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Not Used
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3
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Half Molybdenum or half Chromium, half Molybdenum
(three Group Numbers)
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4
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One and a quarter Chromium, half Molybdenum (two
Group Numbers)
|
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5A
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Two and a quarter Chromium, one Molybdenum
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5B
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Five Chromium, half Molybdenum or nine Chromium, one
Molybdenum (two Group Numbers)
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5C
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Chromium, Molybdenum, Vanadium (five Group Numbers)
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6
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Martensitic Stainless Steels (Grade 410, 415, 429)
(six Group Numbers)
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7
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Ferritic Stainless Steels (Grade 409, 430)
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8
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Austenitic Stainless Steels
-
Group 1 - Grades 304, 316, 317, 347
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Group 2 - Grades 309, 310
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Group 3 - High Manganese Grades
-
Group 4 - High Molybdenum Grades
|
|
9A, B, C
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Two to four Nickel Steels
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10A, B, C, F
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Various low alloy steels
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10H
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Duplex and Super Duplex Stainless Steel (Grades
31803, 32750)
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10I
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High Chromium Stainless Steel
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10J
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High Chromium, Molybdenum Stainless Steel
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10K
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High Chromium, Molybdenum, Nickel Stainless Steel
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11A
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Various high strength low alloy steels (six Group
Numbers)
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11B
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Various high strength low alloy steels (ten Group
Numbers)
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12 to 20
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Not Used
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21
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High Aluminum content (1000 and 3000 series)
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22
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Aluminum (5000 series - 5052, 5454)
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23
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Aluminum (6000 series – 6061, 6063)
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24
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Not Used
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25
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Aluminum (5000 series - 5083, 5086, 5456)
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26 to 30
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Not used
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31
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High Copper content
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32
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Brass
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33
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Copper Silicone
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34
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Copper Nickel
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35
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Copper Aluminum
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36 to 40
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Not Used
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41
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High Nickel content
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42
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Nickel, Copper - (Monel 500)
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43
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Nickel, Chromium, Iron - (Inconel)
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44
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Nickel, Molybdenum – (Hastelloy B2, C22, C276, X)
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45
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Nickel, Chromium
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46
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Nickel, Chromium, Silicone
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47
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Nickel, Chromium, Tungsten
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47 to 50
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Not Used
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51, 52, 53
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Titanium Alloys
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61, 62
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Zirconium Alloys
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