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what is P number
6

what is P number

what is P number

(OP)
Hi,

Who can tell me what the P number means?

Thank you.

RE: what is P number

The P-No is a designation by ASME Boiler and Pressure Vessel Code to categorize the chemical composition and weldability of metals used in the fabrication of pressure retaining items. For example, carbon steels are classified as P-No 1 versus low alloy steels that may be P-No 3 or P-No 4. This number provides guidance in the Code for joining metals during fabrication.

RE: what is P number

(OP)
Thank you very much.

RE: what is P number

This response may be a bit late, hope you see it.  P number means "parent" metal.  Each P number can have sub-groups, usually differentiating acceptable stress levels.  Check this site for a good list of all/most P numbers and some common materials for each.

http://www.gowelding.com/wp/pnumbers.htm

RE: what is P number

Christine,
great link, a double star for you
Regards,
RLS

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