After watching a few youtube videos I came to the understanding that circular saws designed for cutting steel have lower rpm ( ~3500 compared with 4000 ~ 5000 for wood-cutting saws ) and that some of them ( e.g. Hilti ) have safety features such as braking to minimize the harzard when kick-back occurs. Other than these I do not see much other difference. I am wondering if the bad effects ( not sure what they are BTW ) of the higher rpm of wood-cutting saws can be reduced by using smaller steel-cutting blades. I have got a saw for wood. Have used it on aluminum with blades designed for the job and the result is good. May be it's too greedy but I really would like to use it for cutting steel also. Can you guys share some experience / thoughts ?