High speed steel heat treatment process is more complex, must be quenched and tempered and a series of processes. Quenching due to its poor thermal conductivity generally divided into two phases. First at 800 ~ 850 ℃ preheating (in order to avoid large thermal stress), then rapidly heated to the quenching temperature 1190 ~ 1290 ℃ (different grades of actual use temperature difference), the oil cooling or air cooling, or cooling the inflatable body. Factories are using salt furnace heating, vacuum furnaces are now quite extensive. Due to the internal organization also keep part (about 30%) did not change after quenching residual austenite into martensite, affecting the performance of high speed steel. To make the residual austenite, to further improve the hardness and wear resistance, generally 2 to 3 times a tempering, tempering temperature 560 ℃, each incubated for 1 hour.
Manufacturing methods: usually electric production, have been used in the production of high-speed steel powder metallurgy method, so that was a very fine carbide particles uniformly distributed in the matrix, improving the service life.
Uses: used in the manufacture of various cutting tools. Such as turning, drilling, hob, machine saw and demanding mold.