Yes,
you may use 309 grade, in order to avoid hot cracking because of low FN.
If your P11 pipe has to undergo PWHT because of thickness, then you have to butter the P11 with 309, perform the PWHT and then weld it to the 316 using again the 309 filler metal.
This will help you to avoid sensitization of 316.
However, the buttered area has to undergo a corrosion test if the pipe is for wet service and clorines may be present.
For buttering you may need a specific WPS qualification (see ASME IX QW-283)
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Use below filler wire and electrode, Having good weldability. We have qualified PQR with this consumable:
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