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
- Braze ability
- Mechanical Properties
The table below is a guide and is for instructive purposes only rather incomplete and approximate summary of ASME data.
CODE | BASE METAL | ||
EN288 | P-NO ASME | ------------------------------------------------------------------------------------------ | |
1 | 1 | Carbon Manganese Steels (four Group Numbers) | |
2 | Not Used | ||
4 | 3 | Half Molybdenum or half Chromium, half Molybdenum (three Group Numbers) | |
5 | 4 | One and a quarter Chromium, half Molybdenum (two Group Numbers) | |
5 | 5A | Two and a quarter Chromium, one Molybdenum | |
5 | 5B | Five Chromium, half Molybdenum or nine Chromium, one Molybdenum (two Group Numbers) | |
6 | 5C | Chromium, Molybdenum, Vanadium (five Group Numbers) | |
7 | 6 | Martensitic Stainless Steels (Grade 410, 415, 429) (six Group Numbers) | |
8 | 7 | Ferritic Stainless Steels (Grade 409, 430) | |
9 | 8 | Austenitic Stainless Steels Group 1 - Grades 304, 316, 317, 347 Group 2 - Grades 309, 310 Group 3 - High Manganese Grades Group 4 - High Molybdenum Grades | |
7 | 9A, B, C | Two to four percent Nickel Steels | |
- | 10A, B, C, F | Various low alloy steels | |
10 | 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 | ||
7 | 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 | 21 | High Aluminum content (1000 and 3000 series) or pure aluminium | |
22a | 22 | Aluminum (5000 series - 5052, 5454) magnesium | |
23 | 23 | Aluminum (6000 series – 6061, 6063) magnesium silicon grade | |
- | 24 | Not Used | |
22b | 25 | Aluminum (5000 series - 5083, 5086, 5456) manganese | |
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 | ||
