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
Brazeabilit
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.
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 Group Numbers) |
5C | Chromium, Molybdenum, Vanadium (five Group Numbers) |
6 | Martensitic Stainless Steels (Grade 410, 415, 429) (six Group Numbers) |
7 | Ferritic Stainless Steels (Grade 409, 430) |
8 | Austenitic Stainless Steels
|
9A, B, C | Two to four Nickel Steels |
10A, B, C, F | Various low alloy steels |
10H | Duplex and Super Duplex Stainless Steel (Grades 31803, 32750) |
10I | High Chromium Stainless Steel |
10J | High Chromium, Molybdenum Stainless Steel |
10K | High Chromium, Molybdenum, Nickel Stainless Steel |
11A | Various high strength low alloy steels (six Group Numbers) |
11B | Various high strength low alloy steels (ten Group Numbers) |
12 to 20 | Not Used |
21 | High Aluminum content (1000 and 3000 series) |
22 | Aluminum (5000 series - 5052, 5454) |
23 | Aluminum (6000 series – 6061, 6063) |
24 | Not Used |
25 | Aluminum (5000 series - 5083, 5086, 5456) |
26 to 30 | Not used |
31 | High Copper content |
32 | Brass |
33 | Copper Silicone |
34 | Copper Nickel |
35 | Copper Aluminum |
36 to 40 | Not Used |
41 | High Nickel content |
42 | Nickel, Copper - (Monel 500) |
43 | Nickel, Chromium, Iron - (Inconel) |
44 | Nickel, Molybdenum – (Hastelloy B2, C22, C276, X) |
45 | Nickel, Chromium |
46 | Nickel, Chromium, Silicone |
47 | Nickel, Chromium, Tungsten |
47 to 50 | Not Used |
51, 52, 53 | Titanium Alloys |
61, 62 | Zirconium Alloys |
Dear Sir,Good Day !Kindly Guide me whether the below mentioned ASME P NO's corresponds to respective Steel Types, Corrections in error if any is most thankful.This will help me in selecting Proper SFA as Per ASME section II Part C.
Steel Type P NUMBER Carbon Steel 1 Low-Alloy Steel 3,4,5A,5B,5C,6,7,8,9A,9B,9C,11A,11B,10A,10B,10C,10F Stainless Steel 6,7,8,10H,10I,10J,10K --
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