As a machinist,I can tell you that the carbide is harder than nails,but the high speed of the saw blade is way too high for cutting steel,and will ruin the carbide PDQ. Carbide is hard,but also brittle,with very little mechanical strength. When it is used in machining,speeds,feeds,etc. have to be optimal. Interrupted cuts are bad-it can't take the shock. Stopping a lathe with a carbide cutter in the act of cutting nearly always breaks the point off the carbide.
So,be careful about what you think carbide can handle.