
32 Fundamentals of Machining Processes
possesses low hot–hardness as it loses its temper at about 220°C and is,
therefore, suitable for cutting at low speeds (9 m/min when cutting mild
steel) when the heat generated is low. Therefore, it is extensively used for
manufacturing hand tools, wood working cutters, and other tools that
normally work at low cutting speeds. Table 2.3 shows the variations of carbon
tool steels and their corresponding applications. The main advantages of
carbon tool steels are that they are cheap and machinable. They also retain
a tough core, which makes them suitable for applications in which impact
and vibrations ex