What is P number and group number in ASME?

Base Metals: The P Number

P Number Base Metal
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 2 – 4 Nickel Steels
10A, B, C, F Various Low Alloy Steels

What is your P number?

A p-value, or probability value, is a number describing how likely it is that your data would have occurred by random chance (i.e. that the null hypothesis is true). The level of statistical significance is often expressed as a p-value between 0 and 1.

What is P no in material?

To reduce the number of welding procedure qualifications that are required, P-Numbers (shortened to P-No) are assigned to base metals according to the characteristics of the material, such as composition, weldability, brazeability and mechanical properties.

What is P No F No?

The ASME grouping is made using the alphanumeric designation P-No for the base metal and F-numbers (F-No) for the filler material. This grouping is based on comparable characteristics of the material such as weldability, mechanical properties and composition.

What is the P number for Alloy 20?

The P Number of Alloy 20 is 45 according to ASME BPVC Section IX.

What is P NO and F no in welding?

The F number grouping of filler metals refers to their similarity on their usability characteristics. Like the P number, the F number designed to reduce the number of procedure qualification and welding performance qualification.

What is an F number in welding?

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.

What does P stand for in welding?


Term GMAW – S Definition gas metal arc welding with short circuiting transfer
Term GTAW Definition gas tungsten arc welding
Term GTAW – P Definition gas tungsten arc welding pulsed arc
Term PAW Definition plasma arc welding
Term SMAW Definition shielded metal arc welding

What is ASME F number?

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.

What is F number in welding?

What is P7 material?

Characteristics and typical fields of application Avesta P7 is a high-alloy Cr-Ni electrode with approx. 40% ferrite offering high tensile strength and excellent resistance to cracking. The chemical composition corresponds to AWS A5. 4 E312.

What is F4 in welding?

F2 electrodes are most rutile consumables such as E6013. F3 electrodes are cellulosic electrodes such as E6011. F4 electrodes are basic coated electrodes such as E7016 and E7018.

What are P numbers and what are group numbers?

P numbers are groupings of base metals with similar welding characteristics that have been approved for pressure boundaries when constructing pressure vessels or piping systems. Group numbers are sub-groupings within a P number that further subdivides the P number.

How is the P number assigned to base metals?

Base Metals: The P Number. This number is used to group similar Base Metals, allowing qualification of an entire selection versus qualification of just one. These base metals are grouped by material and assigned P Numbers based on what material they are. For example, the P Number 1 is assigned to Carbon Manganese or Low Carbon Steel base metals.

What do the P numbers mean in welding?

Table–2 shows the assignment groups for various metals and their alloys (according to ASME BPVC). Now that we have understood ‘P’ numbers let’s move on to the group numbers. Group numbers are subsets of ‘P’ numbers and assigned to ferrous-based metals.

Is the P number the same as the f number?

Though all materials of the same ‘P’ number don’t exhibit the same properties, but after considering the above-mentioned parameters, ASME has done this logical grouping. Why this grouping is required?