DIYbanter - Type of pipe for Propane

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I know that for Natural gas, galvanized pipe can not be used because
the gas causes the zinc to come off the inside of the pipe and that
clogs orfices. So, black pipe is needed. Generally for propane,
copper tubing is used in my area. However, I want to hook up a small
hanging garage furnace and will have about 5 feet of pipe cross over
in mid air, between the wall and the furnace. I want a more solid
material used in that spot, because of the mid air piping, and also
because this furnace is meant to hang by chains and will likely tend
to move a little from wind when I open the door. I can see that
copper flexing and eventually leaking. The solid steel pipe seems
better, and I can put 1 ro 2 straps to the pipe to solidify it. I
plan to just use the same material for the whole run, because of
dielectric issues of mixing steel and copper. This will be 1/2" steel
pipe. Normally I'd just buy black pipe, but I have enough brand new
galvanized pipe on hand to do the job, and I always try to use what I
have, if it will work. Does anyone know if galvanized pipe is
affected by propane? If not, I'll use what I have.

Brazed copper is used for natural gas around here.