This may be old news for experienced metal workers, but I just bought my first circular saw blade for steel. Wow. I was really impressed. I just used my 7 1/4 Hitachi circ. saw, bolted in the blade and ran it through a sheet of 1/8" mild steel like it was wood. No sparks, just lots of little pieces of steel dust that hurt. Up to this I just used a hack saw, jig saw or reciprocating saw with metal blade to cut very crooked lines in steel. Now I can saw steel very accurately in straight lines.
The blade I got was from Lowes and cost about $25. The specs saw it can cut up to 1/2" mild steel. Have not tried it on stainless yet.
Don