P number in Welding Application
The assigned P Numbers to the materials addressed in the table QW-422. In addition,
you can find minimum specified tensile strength, group number, UNS number, ISO
15608 Group number, nominal composition and product form.
The simple categorization of P number is:
1
Carbon Steel
3
Up to 1/2% Cr and up to 1/2% Mo
4
1 to 2% Cr and up to 1/2% Mo
5A
2 to 3% Cr, 1% Mo Alloy Steel
5B
5 to 10% Cr, 1% Mo Alloy Steel
5C
All 5A and 5B Materials heat treated to 85ksi+
6
Martensitic Stainless Steel
7
Ferritic Stainless Steel
8
Austenitic Stainless Steel
9
2 to 5% Ni Alloy Steel
10
Mn-V, Cr-V, 9%Ni, High Cr Alloy Steels
11
Low Alloy Steel, Quenched and Tempered to 95ksi+
21
1.2% Mg or Mn alloy Aluminum
22
1.2% Mn, 2,5% Mg, 0.25% Cu Aluminum
23
1.3% Mg, 0.7% Si, 0.25% Cr Aluminum
23
1.3% Mg, 0.7% Si, 0.25% Cr Aluminum
25
1.5% Mg, 0.8% Mn, 0.15% Cr Aluminum
31
Copper
32
Admiralty, Naval, Aluminum Brass, Muntz Metal
33
Cu-Si Alloys
34
Cu-Ni Alloys
41
Nickel
51
Titanium
61
Zirconium