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ASME P Number

The F number grouping of filler metals refers to their similarity on their usability characteristics. The usability determines the ability of a welder to deposit a sound weld metal with a certain filler metal. For Non-impacted test applications only, filler metal classification within an SFA specification, with the same F-number and the same A-number and the same minimum tensile strength and the same. Alloy: UNS: Specifications: AWS/ASME: AMS: Other: HAYNES® 25: R30605-AMS 5796-HAYNES® 82: N06082: SFA / A 5.14 (ERNiCr-3) AMS 5836-HAYNES® 188: R30188-AMS 5801.

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.

ASME F Number

The F-number grouping of electrode and welding rod in QW-432 is based essentially on their usability characteristics, which fundamentally determine the ability of welders to make satisfactory welds with a given filler metal. This grouping is made to reduce the number of welding procedure and performance qualifications, where this can logically be done. The grouping does not imply that base metals or filler metals within a group may be indiscriminately substituted for a metal which was used in the qualification test without consideration of the compatibility of the base and filler metal from the standpoint of metallurgical properties, PWHT design and service requirements, and mechanical properties.

Note:- X represents any number 0 to 9

Reference: iiwindia literature and ASME Section IX

Filler Metal F-no 6

Keep reading, happy welding

Thank you,

Filler Metal F Novak

KP Bhatt

Filler Metal F No