I recently went to a stainless steel nozzle for printing. What I found is it required significantly more heat to print PLA than I was used to. I'm not sure if the PLA itself (a brand I'd never used before) was to blame or if the nozzle properties was causing the needed increase. By an increase in heat needed, I'm used to printing PLA in the 190 °C (+/-5 °C). What I'm using right now to prevent stringing and to get good layer adhesion, I'm having to print at 220 °C.
My question is, does nozzle material typically affect the amount of heat needed to print or should we expect heat shouldn't need to be changed? If the nozzle material does affect it, is there any "rules of thumb" to go by on what to expect?