I can't think of a better metal for exterior stuff........The Navy can't be wrong, they use plenty...........
Keeping the ''handles'' cool is simple, just pick up a siphon blow gun a napa, etc, or you can rig your own with a T pipe fitting......If you have a compressor....
If you forge points, tapers, try to do em in one heat. Putting em back inn the forge when the material is thin is dicey....
If you think it maybe too hot, shut the forge down, don't touch it till after it cools a bit........The way I tell the correct forging temp is if the colour red you see has a darkness to it , good to go.........darkness gone........ Danger Rusty Danger!
Oh and EVERYBODY I've ever seen breaks a piece or two from over heating , buy a little extra