ASME P-Numbers

 

 

 

Home
Failure Analysis
TIG Welding
MIG Welding
Flux Cored Welding
Stick Welding
SAW
Resistance Welding
Electron Beam Welding
Robotic Welding
Brazing & Soldering
Expert Witness
Experience
Fees
Links    

 

Distortion

Discontinuities

Alloy Selection

Steel

Stainless Steel

Aluminum

 

 

 

 

Section IX of the ASME BPVC

ASME P-Numbers

Structural Welding

 

 

 

 

 

 

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

  •      Brazeability

  •      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

  •      Group 1 - Grades 304, 316, 317, 347

  •      Group 2 - Grades 309, 310

  •      Group 3 - High Manganese Grades

  •      Group 4 - High Molybdenum Grades

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

 

 


Contact Information

Telephone
407-880-4945 -------- (Consulting is only available for customers)
FAX
CompanyFAX
Postal address    (greater Orlando area)
AMC
2500 Emerald Tree Ln
Apopka, FL 32712
Electronic mail
General Information: consulting@WeldingEngineer.com
Customer Support: consulting@WeldingEngineer.com
Webmaster: consulting@WeldingEngineer.com

 

 

 

Home ] Failure Analysis ] TIG Welding ] MIG Welding ] Flux Cored Welding ] Stick Welding ] SAW ] Resistance Welding ] Electron Beam Welding ] Robotic Welding ] Brazing & Soldering ] Expert Witness ] Experience ] Fees ] Links ]

Send mail to consulting@WeldingEngineer.com with questions or comments about this web site.
Copyright 1999 American Metallurgical Consultants                           
Last modified: March 08, 2012