In addition, annealing schemes  no. 1 and no. 2 (see Figure 1), which involve heating the material to the temperature of 750 °C  followed by low-rate cooling in the furnace, yield lower hardness than schemes no. 4 and 5, which  consist in heating the material to 750 °C and maintaining it at the temperature of 680 °C; furthermore,  extension of the soaking time at 750 °C slightly affects the lowering of the hardness.