Galvanized gives no benefit. However.the tiny mount of zinc oxide produced would be no problem . I would suggest a local weld shop may have some stock to make you something. Material at least 1/8" ( 3 mm) thick if you want it to last awhile. Stainless steel is pretty common, either the magnetic ( like auto exhaust) or non-magnetic. Stainless would not need to be as thick. Try a local junk yard.Bolts would be much more practical than trying to rivet. If you could find it, short length cut from large pipe like 24" diameter. Or , the old stand-by, 55 gal drum , cut off a foot of drum.
Answer from blacksmith37 on Stack ExchangeVideos
building a fire pit starting with a steel ring - Home Improvement Stack Exchange
Advice on rolling fire rings?
Keep in mind that when you roll something with lots of cutouts like that, each part is going to be easier/harder to bend depending how much material is missing. We've made a few of these at work and they often come out goofy shaped.
As for doing it without a roller... it'll be tough to not kink it. 10ga steel is pretty tough to bend by hand
More on reddit.comRed metal ring in front of fire house
Galvanized firepit ring…how is this allowed?
Galvanized gives no benefit. However.the tiny mount of zinc oxide produced would be no problem . I would suggest a local weld shop may have some stock to make you something. Material at least 1/8" ( 3 mm) thick if you want it to last awhile. Stainless steel is pretty common, either the magnetic ( like auto exhaust) or non-magnetic. Stainless would not need to be as thick. Try a local junk yard.Bolts would be much more practical than trying to rivet. If you could find it, short length cut from large pipe like 24" diameter. Or , the old stand-by, 55 gal drum , cut off a foot of drum.
I answered your question. 1 Steel is a better choice than galvanized for the reason you gave. 2 A weld is preferred to bolts. What is it you need help with cutting steel or, using a drill bit? Making a circle is easy. You also need fire rated paint if you don't want rust. I also gave other options, including purchase of one, that will not rust for a long time. It also has no risk of fumes. Grass removal is also key. I guess you need to be more specific.
I teach high school Ag Mechanics classes and we recently bought a Plasma CNC Machine, I was thinking it would be cool to build custom fire rings using rectangular pieces we cut out. Does anyone have any advice or tricks they would care to share in regards to rolling 10-12 gauge steel without an actual steel roller?
Picture for reference:
http://simage1.sportsmansguide.com/adimgs/l/2/208278_ts.jpg
Keep in mind that when you roll something with lots of cutouts like that, each part is going to be easier/harder to bend depending how much material is missing. We've made a few of these at work and they often come out goofy shaped.
As for doing it without a roller... it'll be tough to not kink it. 10ga steel is pretty tough to bend by hand
Cut out some forms with plywood and c clamp the steel to the form then fasten it together.