[MW:10777] Reg:filler wire for dissimilar material

dear experts,

good day all of you.

i need your valuable help: 

which filler wire we can use for dissimilar metals in heater piping

1. ASTM A335 Gr. P9 (9 Cr,1 Mo ) half coupling to ASTM A 240 Gr 310 plate fillet weld.

2. ASTM A335 Gr. P9 (9Cr, 1 Mo ) coil  to ASTM A 351 Gr.HK 40 plate

PL suggest me

thanks & regards

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