RCRAMER.COMASME P Material Numbers
This is a general guide ASME P numbers and their equivalent EN288 groupings. Groups referred to in the Base Metal column are ASME sub groups. EN288 material groups are included for comparison only.
| P No. | EN288 | Base Metal |
| 1 | 1 | Carbon Manganese Steels, 4 Sub Groups
|
| 2 | - | Not Used |
| 3 | 4 | 3 Sub Groups:- Typically half moly and half chrome half moly |
| 4 | 5 | 2 Sub Groups:- Typically one and a quarter chrome half moly |
| 5A | 5 | Typically two and a quarter chrome one moly |
| 5B | 5 | 2 Sub Groups:- Typically five chrome half moly and nine chrome one moly |
| 5C | 6 | 5 Sub Groups:- Chrome moly vanadium |
| 6 | 8 | 6 Sub Groups:- Martensitic Stainless Steels Typically Grade 410 |
| 7 | 8 | Ferritic Stainless Steels Typically Grade 409 |
| 8 | 9 | Austenitic Stainless Steels, 4 Sub groups
|
| 9A, B, C | 7 | Typically two to four percent Nickel Steels |
| 10A,B,C,F,G | ? | Mixed bag of low alloy steels, 10G 36 Nickel Steel |
| 10 H | 10 | Duplex and Super Duplex Grades 31803, 32750 |
| 10J | ? | Typically 26 Chrome one moly |
| 11A Group 1 | 7 | 9 Nickel Steels |
| 11 A Groups 2 to 5 | ? | Mixed bag of high strength low alloy steels. |
| 11B | ? | 10 Sub Groups:- Mixed bag of high strength low alloy steels. |
| 12 to 20 | - | Not Used |
| 21 | 21 | Pure Aluminium |
| 22 | 22a | Aluminium Magnesium Grade 5000 |
| 23 | 23 | Aluminium Magnesium Silicone Grade 6000 |
| 24 | - | Not Used |
| 25 | 22b | Aluminium Magnesium Manganese Typically 5083, 5086 |
| 26 to 30 | Not used | |
| 31 | Pure Copper | |
| 32 | Brass | |
| 33 | Copper Silicone | |
| 34 | Copper Nickel | |
| 35 | Copper Aluminium | |
| 36 to 40 | Not Used | |
| 41 | Pure Nickel | |
| 42 | Nickel Copper:- Monel 500 | |
| 43 | Nickel Chrome Ferrite:- Inconel | |
| 44 | Nickel Moly:- Hastelloy C22, C276 | |
| 45 | Nickel Chrome :- Incoloy 800, 825 | |
| 46 | Nickel Chrome Silicone | |
| 47 | Nickel Chrome Tungstone | |
| 47 to 50 | Not Used | |
| 51, 52, 53 | Titanium Alloys | |
| 61, 62 | Zirconium Alloys |
* Article originally from here and dated dated 25 November 2000
