The cutting edge of a chisel should be Hardened and tempered.
A chisel is a tool with a characteristically shaped cutting edge of blade on its end, for carving or cutting a hard material such as wood, stone, or metal by hand, struck with a mallet, or mechanical power.
cape chisel is a cold chisel that has a long taper on the top and bottom of the cutting end and a narrow edge and is used for cutting keyways and similar flat grooves.
A diamond pointed chisel is used for cutting V-shaped grooves.
A hacksaw is a fine-toothed saw, originally and mainly made for cutting metal. On hacksaws, as with most frame saws, the blade can be mounted with the teeth facing toward or away from the handle, resulting in cutting action on either the push or pull stroke.
The width of slot cut by a hacksaw blade is Greater than the width of the blade.