P-number,G-number F-Number

Refer to the ASME Boiler & Pressure Vessel Code, Section 2 [for materials] & Section 9 for the P,G & F numbers.

ASME BPVC assigns a P-No. for base metals. Each P-Number has a Group-Nos. P-No. is a base metal classification and assigned based on comparable base metal characteristics, such as composition, weldability, brazeability, and mechanical properties.

Group No. is a base metal grouping & classification within the P-No. for impact test requirements.

F-No. is a filler metal (electrodes & welding rods) grouping for qualification, and is based essentially on their usability characteristics which determine the ability of welders to make satisfactory welds with a given filler metals.

Important Note : To define the base metal P-No., Group No. and filler metal F-No., you have to specify the material in accordance with ASME or ASTM, since you can't calculate these Nos. Specifying the metal with its chemical composition is not enough to define its P-No. nor its F-No.

ASME BPVC, Section IX includes a Tables for all base metals and filler metals which define the P-No., Group No. & F-No.

it's mine

yes got it

Apart from what was said earlier, would like add that most of the MS metals fall under P1 and group nos of 1 (or) 2. It varies depending upon the carbon and Manganese % and tensile strength ( which in turn depends on other elements also) of the base metals. i.e., if the C is low and tensile is average-say 60,000 psi, it could be P1 Gr 1. If C/Mn, Si is more and tensils is high-say 70,000 psi and above, it could be P1 Gr 2. Hence ur meterial could be P1 Gr 1 (or) P1 Gr 2.

Electrode req for most of the P1 metals are either F1 ( iron powdered electrodes like E 7024, 7028 etc) , F2 ( rutile electrodes like E 6013, 6012 etc) , F3 ( deep penetration electrodes like E6010, 6011 etc) F4 ( low hydrogen and with iron powder - E 7018, 7048 or without iron poder E7015 , 7016 etc).

Depending upon the application mostly F2 (or) F4 electrodes are recommended for P1 Gr 1 (or) P1 Gr 2 metals and general fabrication. F3 is used for root welding in P1 Gr 1 pipe welding. F1 is for heavy fillets and faster filling like in Ship building, heavy thick structural fabrication etc.

Hence groping of your material and selection of F nos should not be a problem at all.

Wish U good Luck.

Sridhar

hi,

this information is really helpful.Thanks for your response.

looking forward for future assistance.

with regards

For any construction project including welding, you have to select the proper base metal, proper filler metal, and the proper welding procedure(s). Therefore you have to nominate an international Codes & Standards for design, welding, inspection, ....etc.

So, the parameters, P-No., Group No., F-No., ... etc. are easily to be obtained from that code related to the selected material. The code itself put this classification to be followed.

Note : I used to fellow the ASME BPVC in design, construction, welding, inspection, and testing. So may be the parameters prescribed had a different values when you use other codes. So you have to nominate the code required to use its figures.

Hello Sir,

I answered myself.

you should know first what type of the steel and then you should have complete chemical and mechanical testing results, now you can compare the nominal value with ASME SEC IX QW 422 and its subpart regarding the steel is whether casting or steel with its producti form and whilemean you match the correct value that is you p and g number.

Regards

BM NAYI - MANAGER PROD RATNAMANI METALS & TUBES LTD INDIA

bmnayi@gmail.com

For work, I was just reviewing about welding MS to stainless about 4 weeks ago, and I came across this, seems to be a complete chart for P-Numbers

Reference: Welding Engineer Website