ASME 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 Group 1 up to approx  65 ksi Group 2 Approx 70ksi Group 3 Approx 80ksi Group 4 ? 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 Group1  Typically Grades 304, 316, 347 Group 2  Typically Grades 309, 310 Group 3  High manganese grades Group 4 Typically 254 SMO type steels 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

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Page last updated 25 November 2000