The rpm on a regular saw is to fast, so it is not a good idea to just put a metal cutting blade on a regular saw.
The average 14 abrasive cutoff saw turns about 3600 rpm, where as the cold cut saws usually turn at about 1800 rpm.
Way before they came out with the cold cut saws, I was using a carbide blade to cut sheet metal and light angle. I would lose some teeth, and now I know why. Go slow was the answer.
I guess there is a proper speed for the smaller 7 or 8 in blades, that should be used. It has to do with the velocity of the teeth, and there is a big difference in the velocity in a 7 in bld compared to a 14 in bld.